Publications by authors named "Yihe Zhang"

137 Publications

Synergistic Polarization Engineering on Bulk and Surface for Boosting CO2 Photoreduction.

Angew Chem Int Ed Engl 2021 May 31. Epub 2021 May 31.

China University of Geosciences Beijing, School of Materials Science and Technology, CHINA.

Sluggish charge kinetics and low CO2 affinity seriously inhibit CO2 photoreduction. Herein, the synchronous promotion of charge separation and CO2 affinity of Bi4Ti3O12 is realized by coupling corona poling and surface I-grafting. Corona poling enhances ferroelectric polarization of Bi4Ti3O12 by aligning the domains direction, which profoundly promotes charge transfer along opposite directions across bulk. Surface I-grafting forms a surface local electric field for further separating charge carriers, and provides abundant active sites to enhance CO2 adsorption. Notably, the two modifications cooperatively further increase the ferroelectric polarization of Bi4Ti3O12 , which maximize the separation efficiency of photogenerated charges, resulting in a highly-enhanced CO production rate of 15.1 µmol·g -1·h -1 (nearly 9 times) with no sacrificial agents or cocatalysts. This work discloses that ferroelectric polarization and surface ion grafting can promote CO2 photoreduction in a synergistic way.
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http://dx.doi.org/10.1002/anie.202106310DOI Listing
May 2021

Exceptional Cocatalyst-Free Photo-Enhanced Piezocatalytic Hydrogen Evolution of Carbon Nitride Nanosheets from Strong In-Plane Polarization.

Adv Mater 2021 May 8:e2101751. Epub 2021 May 8.

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China.

Utilizing mechanical energy to produce hydrogen is emerging as a promising way to generate renewable energy, but is challenged by low efficiency and scanty cognition. In this work, graphitic carbon nitride (g-C N ) with an atomically thin sheet-like structure is applied for prominent piezocatalytic and photo-enhanced piezocatalytic H production. It is revealed that the anomalous piezoelectricity in g-C N originates from the strong in-plane polarization along the a-axis, contributed by the superimposed polar tri-s-triazine units and flexoelectric effect derived from the structured triangular cavities, which provides powerful electrochemical driving force for the water reduction reaction. Furthermore, the photo-enhanced charge transfer enables g-C N nanosheets to reserve more energized polarization charges to fully participate in the reaction at the surface reactive sites enriched by strain-induced carbon vacancies. Without any cocatalysts, an exceptional photo-piezocatalytic H evolution rate of 12.16 mmol g h is delivered by the g-C N nanosheets, far exceeding that of previously reported piezocatalysts and g-C N photocatalysts. Further, high pure-water-splitting performance with production of the value-added oxidation product H O via photo-piezocatalysis is also disclosed. This work not only exposes the potential of g-C N as a piezo-semiconductor for catalytic H evolution, but also breaks a new ground for the conversion of solar and mechanical energy by photomediated piezocatalytic reaction.
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http://dx.doi.org/10.1002/adma.202101751DOI Listing
May 2021

High-density polyethylene composite filled with red mud: effect of coupling agent on mechanical and thermal properties.

Environ Technol 2021 May 12:1-12. Epub 2021 May 12.

School of Earth Sciences and Resources, China University of Geosciences, Beijing, People's Republic of China.

In this study, red mud (RM) was modified with titanate coupling agent (triisostearoyl isopropoxy titanate, KR-TTS), and then the modified RM was melted blending with high-density polyethylene (HDPE) to prepare HDPE-based composite. The action mechanism of KR-TTS on the properties of HDPE composites was analysed combining with the movement mode of polyethylene macromolecular chain segments. The entanglement and mechanical interlocking of long alkyl chains of titanate coupling agent and the polyethylene molecular chains occurs in modified RM/HDPE composite, reflected by fracture morphology within tension process. The stronger interface interaction results in a decrease of polyethylene molecular chain segments motion under external loading, externally expressed as higher tensile strength and tensile modulus as well as storage modulus. Meanwhile, KR-TTS imparts modified RM/HDPE composite with higher elongation at break of uniaxial tension and lower damping ratio. The impact strength presents an improvement from 5.62 kJ/m of RM/HDPE composite to 6.56 kJ/m of modified RM/HDPE composite due to stronger interface strength. And modified RM/HDPE composite appears higher thermal stability, attributed to better particles dispersion and higher interface adhesion. Differential scanning calorimetric analysis shows that with the addition of coupling agent, the melt enthalpy of modified RM/HDPE composite decreases, indicating a decrement in the crystallinity of polyethylene composites (from 70.2% of RM/HDPE to 63.1% of modified RM/HDPE), resulted from the retarded stacking speed of chain segments into the crystal lattice during crystal growth.
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http://dx.doi.org/10.1080/09593330.2021.1921047DOI Listing
May 2021

Biofriendly molecular and protein release substrate with integrated piezoelectric motivation and anti-oxidative stress capabilities.

Nanoscale 2021 May;13(18):8481-8489

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China.

Self-powered piezoelectrically active molecular or protein delivery devices have provoked great interest in recent years. However, electric fields used to promote delivery or healing may also induce the redox of water or oxygen to generate reactive oxygen species (ROS) and bring unintended oxidative pressure to the organism and harm biological functions. In addition, protein molecules are easily inactivated in the polymer reservoir matrix due to the pull of strong electrostatic effects. In this study, a multifunctional molecular delivery substrate was fabricated by integrating a piezoelectric-dielectric polymeric substrate, nanoscopic polyelectrolyte films and in-film deposited biomimetic porous CaP coating. The piezoelectric substrate promoted molecular release, and the mineralized coating effectively stored molecules or proteins and simultaneously eliminated ROS, reducing the oxidative stress response generated by oxidative pressure. The present work opens a new way for the development of multifunctional and biofriendly drug delivery devices.
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http://dx.doi.org/10.1039/d1nr01676hDOI Listing
May 2021

Carbon ion radiotherapy for recurrent calf myxoid liposarcoma: a case report.

J Int Med Res 2021 Apr;49(4):3000605211009701

Heavy Ion Radiotherapy Department of Cancer Hospital, Wuwei, Gansu, China.

Liposarcoma (LPS) is the most common soft tissue sarcoma. Myxoid LPS (MLPS) is the second most common subtype of LPS and accounts for 25% to 50% of all LPSs. Like most other soft tissue sarcomas, the mainstay of treatment for LPS is inevitably surgery. Multidisciplinary approaches, including surgery, chemotherapy, and radiotherapy, have been successful in the treatment of LPS during the last three decades. Even so, recurrence of LPS remains challenging. Carbon ion beams produce increased energy deposition at the end of their range to form a Bragg peak while minimizing irradiation damage to surrounding tissues, which facilitates more precise dosage and localization than that achieved with photon beams. Furthermore, carbon ion beams have high relative biologic effectiveness. We herein describe a patient who developed recurrent MLPS in the right calf after two surgeries and underwent carbon ion radiotherapy (CIRT), achieving complete disappearance of the tumor. The patient developed Grade 1 radiation dermatitis 30 days after CIRT, but no other acute toxicities were observed. The tumor had completely disappeared by 120 days after CIRT, and the patient remained disease-free for 27 months after CIRT. The CARE guidelines were followed in the reporting of this case.
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http://dx.doi.org/10.1177/03000605211009701DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8074479PMC
April 2021

Metabolically healthy obesity increases the prevalence of stroke in adults aged 40 years or older: Result from the China National Stroke Screening survey.

Prev Med 2021 Jul 18;148:106551. Epub 2021 Apr 18.

Department of Epidemiology and Health Statistics, College of Public Health, Zhengzhou University, Zhengzhou, Henan Province, China. Electronic address:

Debate over the cardio-cerebrovascular risk associated with metabolically healthy obesity (MHO) continues. In this study we investigated the association of MHO with the risk of stroke among 221,114 individuals aged 40 years or older based on data from the China National Stroke Screening and Prevention Project (CNSSPP), a nationally representative cross-sectional study, during 2014 to 2015. Different metabolic health and obesity phenotypes were defined according to the Adult Treatment Panel III (ATP III) criteria, where obesity was defined as a body mass index (BMI) ≥28 kg/m. Logistic regression models were used to estimate the odds ratios (ORs) and 95% confidence intervals (CIs) for stroke risk associated with different metabolically healthy phenotypes. BMI was used to estimate the mediation effect for metabolic abnormalities to stroke. Compared with the metabolically healthy non-obesity (MHNO) group, individuals with MHO (adjusted OR: 1.21, 95% CI: 1.10,1.33), metabolically unhealthy non-obesity (MUNO) (adjusted OR:1.41, 95% CI: 1.36,1.46), or metabolically unhealthy obesity (MUO) (adjusted OR: 1.70, 95% CI: 1.61,1.80) were found to have an increased risk of stroke. The findings were confirmed robustly by various sensitivity analyses and subgroup analyses. Furthermore, obesity and metabolic abnormalities had an additive interaction for stroke risk with an attributable proportion (AP) of 14.0% in females. BMI played a partial mediating role with the proportion of the effect (PE) at 11.1% in the relationship between metabolic abnormalities and stroke. This study strengthens the evidence that management and interventions in the MHO population may contribute to the primary prevention of stroke.
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http://dx.doi.org/10.1016/j.ypmed.2021.106551DOI Listing
July 2021

Recent Development of Alginate-Based Materials and Their Versatile Functions in Biomedicine, Flexible Electronics, and Environmental Uses.

ACS Biomater Sci Eng 2021 04 25;7(4):1302-1337. Epub 2021 Mar 25.

Institute of Orthopedics, Fourth Medical Center of the General Hospital of CPLA, Beijing 100048, China.

Alginate is a natural polysaccharide that is easily chemically modified or compounded with other components for various types of functionalities. The alginate derivatives are appealing not only because they are biocompatible so that they can be used in biomedicine or tissue engineering but also because of the prospering bioelectronics that require various biomaterials to interface between human tissues and electronics or to serve as electronic components themselves. The study of alginate-based materials, especially hydrogels, have repeatedly found new frontiers over recent years. In this Review, we document the basic properties of alginate, their chemical modification strategies, and the recent development of alginate-based functional composite materials. The newly thrived functions such as ionically conductive hydrogel or 3D or 4D cell culturing matrix are emphasized among other appealing potential applications. We expect that the documentation of relevant information will stimulate scientific efforts to further develop biocompatible electronics or smart materials and to help the research domain better address the medicine, energy, and environmental challenges faced by human societies.
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http://dx.doi.org/10.1021/acsbiomaterials.1c00116DOI Listing
April 2021

Functional Material Systems Based on Soft Cages.

Chem Asian J 2021 May 6;16(10):1198-1215. Epub 2021 Apr 6.

School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, P. R. China.

Discrete molecular soft cages integrate multiple functionalities in one molecule. They express their functions from the confined space in their cavity, functional groups in the cavity interior wall and exterior wall, and the chelating nodes in many chelating cages. Such functional integrity render cage molecules special applications in material engineering. Increasing applications of cage molecules in material design have been reported in recent years. Compared with other cavity-rich molecular structures such as metal-organic framework (MOF) or covalent organic frameworks (COF), discrete soft cages present the unique advantage of material design flexibility, that they can easily composite with nanoparticles or polymers and exist in materials of various forms. We document the development of cage-based materials in recent years and expect to further inspire materials engineering to integrate contribution from the functionality specificity of cage molecules and ultimately promote the development of functional materials and thus human life qualities.
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http://dx.doi.org/10.1002/asia.202100178DOI Listing
May 2021

Double-side effect of B/C ratio on BDD electrode detection for heavy metal ion in water.

Sci Total Environ 2021 Jun 28;771:145430. Epub 2021 Jan 28.

Beijing Key Laboratory of Materials Utilisation of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian, Beijing 100083, China. Electronic address:

BDD (Boron-doped Diamond) electrode may hold a promising application to detect heavy metal ions for actual water monitoring and early warning, but a poor understanding of influence mechanism of B/C ratio on detection performance is in the way of its fabrication and application. This work is intended to reveal the double-side effect of B/C ratio on detection performance of BDD electrode so as to facilitate its actual application. SBDD (Self-supported Boron-doped Diamond) electrode is introduced for the first time to get rid of the interference factors such as substrate. A systematic investigation is conducted for the influence of B/C ratio on microstructure and electrochemical behavior of SBDD electrodes. With the increase of B/C ratio, the grain size continuously increases, and the preferred orientation gradually changes from plane (220) to (111). The gradual increasing of impurity phase content indicates a deterioration of diamond phase quality. In addition, the electrode electrochemical behavior initially gets better then worse. SBDD electrode with a B/C ratio of 1/500 has the largest active surface area of 2.1 cm, the smallest diffusion resistance and the highest signal response. Under optimal parameter set, the SBDD electrode enjoys a sensitivity of 0.42 μA L μg cm and a detection limit of 1.12 μg L in a wide linear range of 5-120 ppb. The phase quality and grain morphology jointly contribute to the double-side effect. A suitable B-sp-C content, preferred orientation of (111) and small particle size may make the performance improvement of BDD electrode available.
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http://dx.doi.org/10.1016/j.scitotenv.2021.145430DOI Listing
June 2021

Hydrogen Bond Enhances Photomechanical Swing of Liquid-Crystalline Polymer Bilayer Films.

ACS Appl Mater Interfaces 2021 Feb 29;13(5):6585-6596. Epub 2021 Jan 29.

School of Materials Science and Engineering, and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Engineering, Peking University, Beijing 100871, P. R. China.

Mechanical swing is common in nature, such as sound waves, wingbeat of birds, and heartbeat, which is important to convert input energy into continuous motion. Here, we report a photodriven swing actuator composed of commercially available polyimide (Kapton) and azobenzene-containing liquid-crystalline polymers. The liquid-crystalline polymers act as the photoactive layer, which were synthesized by copolymerization of one benzenecarboxylic acid-containing monomer (MBCOOH) and one azobenzene-containing monomer (MABOC) with different molar ratios. The Kapton layer with a high elastic modulus is photoinert and functions as the substrate layer. After thermal annealing, the film displays chaotic swing under continuous irradiation of actinic light. Interestingly, the swing amplitude is greatly enhanced by the existence of supramolecular hydrogen bonding in liquid-crystalline polymer films. It is the introduction of MBCOOH to the copolymer that accelerates the trans-cis photoisomerization rate of azobenzenes. Also, it forms a hydrogen bond as physical crosslinking sites, enabling the polymer film to work as a whole. Thus, it enhances the driving force for photomechanical deformation. Moreover, it improves the elastic modulus of the photoactive layer and modulates the swing behavior of the bilayer strip. More importantly, the formation of a hydrogen bond in the form of acidic dimers has a spatial confinement effect, extending the timescale of photodriven swing. The photomechanical self-vibration of the bilayer film can be ascribed to the combination of the photoisomerization process of azobenzenes with the local photosoftening effect of liquid-crystalline polymers.
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http://dx.doi.org/10.1021/acsami.0c18449DOI Listing
February 2021

Atomic-Level Charge Separation Strategies in Semiconductor-Based Photocatalysts.

Adv Mater 2021 Mar 27;33(10):e2005256. Epub 2021 Jan 27.

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China.

Semiconductor-based photocatalysis as a productive technology furnishes a prospective solution to environmental and renewable energy issues, but its efficiency greatly relies on the effective bulk and surface separation of photoexcited charge carriers. Exploitation of atomic-level strategies allows in-depth understanding on the related mechanisms and enables bottom-up precise design of photocatalysts, significantly enhancing photocatalytic activity. Herein, the advances on atomic-level charge separation strategies toward developing robust photocatalysts are highlighted, elucidating the fundamentals of charge separation and transfer processes and advanced probing techniques. The atomic-level bulk charge separation strategies, embodied by regulation of charge movement pathway and migration dynamic, boil down to shortening the charge diffusion distance to the atomic-scale, establishing atomic-level charge transfer channels, and enhancing the charge separation driving force. Meanwhile, regulating the in-plane surface structure and spatial surface structure are summarized as atomic-level surface charge separation strategies. Moreover, collaborative strategies for simultaneous manipulation of bulk and surface photocharges are also introduced. Finally, the existing challenges and future prospects for fabrication of state-of-the-art photocatalysts are discussed on the basis of a thorough comprehension of atomic-level charge separation strategies.
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http://dx.doi.org/10.1002/adma.202005256DOI Listing
March 2021

Photocatalytic Oxygen Evolution from Water Splitting.

Adv Sci (Weinh) 2020 Jan 18;8(1):2002458. Epub 2020 Nov 18.

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences Beijing 100083 China.

Photocatalytic water splitting has attracted a lot of attention in recent years, and O evolution is the decisive step owing to the complex four-electrons reaction process. Though many studies have been conducted, it is necessary to systematically summarize and introduce the research on photocatalytic O evolution, and thus a systematic review is needed. First, the corresponding principles about O evolution and some urgently encountered issues based on the fundamentals of photocatalytic water splitting are introduced. Then, several types of classical water oxidation photocatalysts, including TiO, BiVO, WO, -FeO, and some newly developed ones, such as Sillén-Aurivillius perovskites, porphyrins, metal-organic frameworks, etc., are highlighted in detail, in terms of their crystal structures, synthetic approaches, and morphologies. Third, diverse strategies for O evolution activity improvement via enhancing photoabsorption and charge separation are presented, including the cocatalysts loading, heterojunction construction, doping and vacancy formation, and other strategies. Finally, the key challenges and future prospects with regard to photocatalytic O evolution are proposed. The purpose of this review is to provide a timely summary and guideline for the future research works for O evolution.
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http://dx.doi.org/10.1002/advs.202002458DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7788637PMC
January 2020

Active Basal Plane Catalytic Activity via Interfacial Engineering for a Finely Tunable Conducting Polymer/MoS Hydrogen Evolution Reaction Multilayer Structure.

ACS Appl Mater Interfaces 2021 Jan 4;13(1):734-744. Epub 2021 Jan 4.

State Key Laboratory of Geological Processes & Mineral Resources, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China.

The fixation of the catalyst interface is an important consideration for the design of practical applications. However, the electronic structure of MoS is sensitive to its embedding environment, and the catalytic performance of MoS catalysts may be altered significantly by the type of binding agents and interfacial structure. Interfacial engineering is an effective method for designing efficient catalysts, arising from the close contact between different components, which facilitates charge transfer and strong electronic interactions. Here, we have developed a layer-by-layer (LbL) strategy for the preparation of interfacial MoS-based catalyst structures with two types of conducting polymers on various substrates. We demonstrate how the assembled partners in the LbL structure can significantly impact the electronic structures in MoS. As the number of bilayers grows, using polypyrrole as a binder remarkably increases the catalytic efficacy as compared to using polyaniline. On the one hand, the ratio of S (or S), which is related to the remaining active hydrogen evolution reaction (HER) species, is further increased. On the other hand, density functional theory calculations indicate that the interfacial charge transport from the conducting polymers to MoS may boost the HER activity of the interfacial structure of the conducting polymer/MoS by decreasing the adsorption free energy of the intermediate H* at the S sites in the basal plane of MoS. The optimized catalytic efficacy of the (conducting polymer/MoS) assembly peaks is obtained with 16 assembly cycles. In preparing interfacial catalytic structures, the LbL-based strategy exhibits several key advantages, including the flexibility of choosing assembly partners, the ability to fine-tune the structures with precision at the nanometer scale, and planar homogeneity at the centimeter scale. We expect that this LbL-based catalyst immobilization strategy will contribute to the fundamental understanding of the scalability and control of highly efficient electrocatalysts at the interface for practical applications.
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http://dx.doi.org/10.1021/acsami.0c20176DOI Listing
January 2021

Calcium Superphosphate-Mediated Reshaping of Denitrifying Bacteria Community Contributed to NO Mitigation in Pig Manure Windrow Composting.

Int J Environ Res Public Health 2020 12 29;18(1). Epub 2020 Dec 29.

Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.

Composting is recognized as an effective strategy for the sustainable use of organic wastes, but also as an important emission source of nitrous oxide (NO) contributing to global warming. The effects of calcium superphosphate (CaSSP) on NO production during composting are reported to be controversial, and the intrinsic microbial mechanism remains unclear. Here, a pig manure windrow composting experiment lasting for ~60 days was performed to evaluate the effects of CaSSP amendment (5%, /) on NO fluxes in situ, and to determine the denitrifiers' response, and their driving factors. Results indicated that CaSSP amendment significantly reduced NO emissions as compared to the control pile (maximum NO emission rate reduced by 64.5% and total emission decreased by 49.8%). CaSSP amendment reduced the abundance of gene encoding for nitrite reductase, while the abundance of gene (NO reductase) was enriched. Finally, we built a schematic model and indicated that the abundance of gene was likely to play a key role in mediating NO production, which were correlated with NH-N and NO-N changing responsive to CaSSP. Our finding implicates that CaSSP application could be a potential strategy for NO mitigation in manure windrow composting, and the revealed microbial mechanism is helpful for deepening the understanding of the interaction among N-cycle functional genes, physicochemical factors, and greenhouse gases (GHG) emissions.
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http://dx.doi.org/10.3390/ijerph18010171DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7795020PMC
December 2020

Photocatalysis-Assisted CoO/g-CN p-n Junction All-Solid-State Supercapacitors: A Bridge between Energy Storage and Photocatalysis.

Adv Sci (Weinh) 2020 Nov 1;7(22):2001939. Epub 2020 Oct 1.

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences Beijing 100083 P. R. China.

Supercapacitors with the advantages of high power density and fast discharging rate have full applications in energy storage. However, the low energy density restricts their development. Conventional methods for improving energy density are mainly confined to doping atoms and hybridizing with other active materials. Herein, a CoO/g-CN p-n junction with excellent capacity is developed and its application in an all-solid-state flexible device is demonstrated, whose capacity and energy density are considerably enhanced by simulated solar light irradiation. Under photoirradiation, the capacity is increased by 70.6% at the maximum current density of 26.6 mA cm and a power density of 16.0 kW kg. The energy density is enhanced from 7.5 to 12.9 Wh kg with photoirradiation. The maximum energy density reaches 16.4 Wh kg at a power density of 6.4 kW kg. It is uncovered that the lattice distortion of CoO, reduces defects of g-CN, and the facilitated photo-generated charge separation by the CoO/g-CN p-n junction all make contributions to the promoted electrochemical storage performance. This work may provide a new strategy to enhance the energy density of supercapacitors and expand the application range of photocatalytic materials.
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http://dx.doi.org/10.1002/advs.202001939DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7675041PMC
November 2020

Reply to the comments by Venkata Siva Naga Sai Goli and Devendra Narain Singh of the paper "Incorporation of Xuan-paper waste residue in red mud/waste polyethylene composites".

J Hazard Mater 2021 02 2;404(Pt A):124161. Epub 2020 Oct 2.

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Circular Economy Engineering Laboratory, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China. Electronic address:

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http://dx.doi.org/10.1016/j.jhazmat.2020.124161DOI Listing
February 2021

A Novel 3D Model for Visualization and Tracking of Fibroblast-Guided Directional Cancer Cell Migration.

Biology (Basel) 2020 Oct 8;9(10). Epub 2020 Oct 8.

Department of Biological Sciences, Xian Jiaotong Liverpool University, 111 Ren Ai Road, Suzhou 215123, China.

Stromal fibroblasts surrounding cancer cells are a major and important constituent of the tumor microenvironment not least because they contain cancer-associated fibroblasts, a unique fibroblastic cell type that promotes tumorigenicity through extracellular matrix remodeling and secretion of soluble factors that stimulate cell differentiation and invasion. Despite much progress made in understanding the molecular mechanisms that underpin fibroblast-tumor cross-talk, relatively little is known about the way the two cell types interact from a physical contact perspective. In this study, we report a novel three-dimensional dumbbell model that would allow the physical interaction between the fibroblasts and cancer cells to be visualized and monitored by microscopy. To achieve the effect, the fibroblasts and cancer cells in 50% Matrigel suspension were seeded as independent droplets in separation from each other. To allow for cell migration and interaction, a narrow passage of Matrigel causeway was constructed in between the droplets, effectively molding the gel into the shape of a dumbbell. Under time-lapse microscopy, we were able to visualize and image the entire process of fibroblast-guided cancer cell migration event, from initial vessel-like structure formation by the fibroblasts to their subsequent invasion across the causeway, attracting and trapping the cancer cells in the process. Upon prolonged culture, the entire population of fibroblasts eventually infiltrated across the passage and condensed into a spheroid-like cell mass, encapsulating the bulk of the cancer cell population within. Suitable for almost every cell type, our model has the potential for a wider application as it can be adapted for use in drug screening and the study of cellular factors involved in cell-cell attraction.
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http://dx.doi.org/10.3390/biology9100328DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7600195PMC
October 2020

A Novel 3D Model for Visualization and Tracking of Fibroblast-Guided Directional Cancer Cell Migration.

Biology (Basel) 2020 Oct 8;9(10). Epub 2020 Oct 8.

Department of Biological Sciences, Xian Jiaotong Liverpool University, 111 Ren Ai Road, Suzhou 215123, China.

Stromal fibroblasts surrounding cancer cells are a major and important constituent of the tumor microenvironment not least because they contain cancer-associated fibroblasts, a unique fibroblastic cell type that promotes tumorigenicity through extracellular matrix remodeling and secretion of soluble factors that stimulate cell differentiation and invasion. Despite much progress made in understanding the molecular mechanisms that underpin fibroblast-tumor cross-talk, relatively little is known about the way the two cell types interact from a physical contact perspective. In this study, we report a novel three-dimensional dumbbell model that would allow the physical interaction between the fibroblasts and cancer cells to be visualized and monitored by microscopy. To achieve the effect, the fibroblasts and cancer cells in 50% Matrigel suspension were seeded as independent droplets in separation from each other. To allow for cell migration and interaction, a narrow passage of Matrigel causeway was constructed in between the droplets, effectively molding the gel into the shape of a dumbbell. Under time-lapse microscopy, we were able to visualize and image the entire process of fibroblast-guided cancer cell migration event, from initial vessel-like structure formation by the fibroblasts to their subsequent invasion across the causeway, attracting and trapping the cancer cells in the process. Upon prolonged culture, the entire population of fibroblasts eventually infiltrated across the passage and condensed into a spheroid-like cell mass, encapsulating the bulk of the cancer cell population within. Suitable for almost every cell type, our model has the potential for a wider application as it can be adapted for use in drug screening and the study of cellular factors involved in cell-cell attraction.
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http://dx.doi.org/10.3390/biology9100328DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7600195PMC
October 2020

Multi-omics profiling highlights lipid metabolism alterations in pigs fed low-dose antibiotics.

BMC Genet 2020 09 21;21(1):112. Epub 2020 Sep 21.

Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518120, China.

Background: In order to study the relations of hepatocellular functions, weight gain and metabolic imbalance caused by low-dose antibiotics (LDA) via epigenetic regulation of gene transcription, 32 weaned piglets were employed as animal models and randomly allocated into two groups with diets supplemented with 0 or LDA (chlorotetracycline and virginiamycin).

Results: During the 4 weeks of the experiment, LDA showed a clear growth-promoting effect, which was exemplified by the significantly elevated body weight and average daily gain. Promoter methylome profiling using liquid hybridization capture-based bisulfite sequencing (LHC-BS) indicated that most of the 745 differential methylation regions (DMRs) were hypermethylated in the LDA group. Several DMRs were significantly enriched in genes related with fatty acids metabolic pathways, such as FABP1 and PCK1. In addition, 71 differentially expressed genes (DEGs) were obtained by strand-specific transcriptome analysis of liver tissues, including ALOX15, CXCL10 and NNMT, which are three key DEGs that function in lipid metabolism and immunity and which had highly elevated expression in the LDA group. In accordance with these molecular changes, the lipidome analyses of serum by LC-MS identified 38 significantly differential lipids, most of which were downregulated in the LDA group.

Conclusions: Our results indicate that LDA could induce epigenetic and transcriptional changes of key genes and lead to enhanced efficiency of lipid metabolism in the liver.
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http://dx.doi.org/10.1186/s12863-020-00918-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7507292PMC
September 2020

Incorporation of Xuan-paper waste residue in red mud/waste polyethylene composites.

J Hazard Mater 2020 11 27;399:123051. Epub 2020 May 27.

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Circular Economy Engineering Laboratory, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China. Electronic address:

Xuan-paper waste residue (XPWR) is an unfamiliar and unique solid waste in China, which caused serious environmental pollution and waste of resources. Therefore, it is extremely important to explore the characteristics of XPWR and its application. In this paper, XPWR was analyzed and used as a reinforcing filler to prepare red mud/waste polyethylene/Xuan-paper waste residue (RM/WPE/XPWR) composites by molding method at 160 °C with a pressure of 10 MPa for 5-10 min. There were about 27 wt% of mineral particles and 63 wt% of organic fibers in XPWR, indicating that XPWR can be used as a reinforcing filler. When 60 wt% of XPWR was added in RM/WPE, the bending strength reached 71.81 MPa, which surpassed 43.08 % than that of RM/WPE. Besides, the addition of XPWR increased the water absorption of the composites and helped to promote the crystallization of the composites. This work presented the characteristics of XPWR and provided a new way to use XPWR.
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http://dx.doi.org/10.1016/j.jhazmat.2020.123051DOI Listing
November 2020

Enhanced Electricity Generation and Tunable Preservation in Porous Polymeric Materials via Coupled Piezoelectric and Dielectric Processes.

Adv Mater 2020 Oct 25;32(39):e2003087. Epub 2020 Aug 25.

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China.

Biological systems and artificial devices convert omnipresent low-frequency and weak mechanical stimulation into electricity for important functions. However, in-depth understanding of the energy conversion, boosting, and preservation processes of the coupled piezo-dielectric phenomenon in polymeric artificial materials is still lacking. In this study, combined experimental and simulation methods are employed to rationalize the process of energy conversion and preservation via a coupled piezo-dielectric phenomena in composite polymeric films. Both the intensity of the transmembrane electric voltages and the kinetic aspects of the energy generation and preservation process are elucidated. The study indicates that composite films consisting of a conductive filler fraction below the percolation threshold, effectively convert low-frequency mechanical stimulation to preserved electrical energy. Interestingly, film structure engineered into porous film has the ability to break the intertwined high-voltage and exhibits a low-preservation-period relationship; it can simultaneously provide high electric field intensity, high induction velocity, and a long preservation period. The model is not only supported by the experiments but is also consistent with the electricity generation and preservation features of other reported piezo-dielectric films. The systematic understanding can facilitate and inspire new device designs to better address the energy, environmental, and biomedical challenges faced by modern societies.
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http://dx.doi.org/10.1002/adma.202003087DOI Listing
October 2020

Construction of Sn-P-graphene microstructure with Sn-C and P-C co-bonding as anodes for lithium-ion batteries.

Chem Commun (Camb) 2020 Sep;56(72):10572-10575

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Istes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, No. 29, Xueyuan Road, Haidian District, Beijing 100083, People's Republic of China.

In this work, a [email protected] composite is synthesized using a direct high-energy ball milling (HEBM) method with P, Sn, and expanded graphite (EG). The in situ formed few layered graphene (FLG) prevents the formation of Sn4P3 and establishes strong Sn-C and P-C co-bonding in the resultant [email protected] composite. Excellent lithium storage is also revealed due to the key effect of FLG to benefit the electronic transfer and buffer expansion stress of the electrode from Sn and P.
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http://dx.doi.org/10.1039/d0cc04817hDOI Listing
September 2020

Photocatalysis Enhanced by External Fields.

Angew Chem Int Ed Engl 2020 Aug 7. Epub 2020 Aug 7.

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, P. R. China.

The efficient conversion of solar energy by means of photocatalysis shows huge potential to relieve the ongoing energy crisis and increasing environmental pollution. However, unsatisfactory conversion efficiency still hinders its practical application. The introduction of external fields can remarkably enhance the photocatalytic performance of semiconductors from the inside out. This review focuses on recent advances in the application of diverse external fields, including microwaves, mechanical stress, temperature gradient, electric field, magnetic field, and coupled fields, to boost photocatalytic reactions, for applications in, for example, contaminant degradation, water splitting, CO reduction, and bacterial inactivation. The relevant reinforcement mechanisms of photoabsorption, the transport and separation of photoinduced charges, and adsorption of reagents by the external fields are highlighted. Finally, the challenges and outlook for the development of external-field-enhanced photocatalysis are presented.
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http://dx.doi.org/10.1002/anie.202009518DOI Listing
August 2020

Sn-Decorated red P entangled in CNTs as anodes for advanced lithium ion batteries.

Dalton Trans 2020 Aug;49(31):10909-10917

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, PR China.

Phosphorus (P) is an appealing electrode material for lithium ion batteries owing to its high theoretical capacity. In particular, red P has attracted considerable research attention due to its commercial availability, low cost and easy handling. In this study, red P was combined with Sn particles and then interwoven into a carbon nanotube network ([email protected]@CNT). The electronic conductivity can be enhanced by the dual effect of the conductive CNT framework and decorated Sn particles. The Li storage capability of red P and Sn can be boosted with the synergistic effect, both contributing to the overall capacity of the composite. The [email protected]@CNT composite exhibits excellent lithium storage performance, delivering a capacity of 1197 mA h g-1 after 200 cycles at 0.2 A g-1. Outstanding cyclic stability and high rate capability are also exhibited, with a capacity retention of 79% in 200 cycles and a capacity of 911 mA h g-1 at 10 A g-1. The ex situ X-ray diffraction and X-ray photoelectron spectroscopic study also reveals the reversible lithiation mechanism of the [email protected]@CNT composite, forming Li3P and Li22Sn5. The systematic investigation on the low-cost [email protected]@CNT sheds light on the development of high-performance red P-based lithium-ion batteries for real applications.
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http://dx.doi.org/10.1039/d0dt01672aDOI Listing
August 2020

CuCo S -rGO Microflowers: First-Principle Calculation and Application in Energy Storage.

Small 2020 Jul 9;16(28):e2001468. Epub 2020 Jun 9.

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, P. R. China.

This paper demonstrates the ability of a CuCo S -reduced graphene oxide (rGO) composite to perform robust electrochemical performances applying to supercapacitors (SCs) and lithium ion batteries (LIBs). The first-principle calculation based on density functional theory is conducted to study the electronic property of CuCo O and CuCo S and provide a theoretical basis for this work. Then, the 3D spinel-structured CuCo O and CuCo S microflowers are synthesized and compared as electrodes for both SCs and LIBs. The CuCo S microflowers can provide a larger specific surface area, which enlarges the contact area between the electrode material and the electrolyte and contributes to high-efficiency electrochemical reactions. The reduced graphene oxides are coated on the CuCo S microflowers, therefore effectively increasing the conductivity, and further absorbing the stress produced in the reaction process. As an electrode of a symmetric supercapacitor, the optimized CuCo S -rGO composite exhibits an energy density of 16.07 Wh kg and a maximum power density of 3600 W kg . Moreover, the CuCo S -rGO composite can also be used as an anode for lithium ion batteries, exhibiting a reversible capacity of 1050 mAh g after 140 cycles at the current density of 200 mA g . The galvanostatic intermittence titration techniques also reveal superior Li-ion diffusion behavior of the CuCo S -rGO composite during redox reactions.
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http://dx.doi.org/10.1002/smll.202001468DOI Listing
July 2020

31-year contrasting agricultural managements affect the distribution of organic carbon in aggregate-sized fractions of a Mollisol.

Sci Rep 2020 06 3;10(1):9041. Epub 2020 Jun 3.

Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, 150081, P.R. China.

Evaluation of soil organic carbon (SOC) dynamics is often limited by the complexity of soil matrix. Quantitative information on the distribution of SOC within aggregate hierarchy will help elucidate the carbon flow in soil matrix. However, this knowledge still needs to be documented. Soils were sampled from a surface Mollisol with plots under 100 years of continuous cropping, 31 years of simulated overgrazing to severely degraded bareland, and grassland restoration from cropped soil. A combined density and chemical fractionation procedure within water-stable aggregate was utilized to quantify the distribution of OC after long-term different land use patterns. Results showed that grassland significantly increased total SOC and mean aggregate associated OC compared to initial soil in 1985 with total SOC (g kg soil) from 46.1 to 31.7 and mean aggregate associated OC (g kg aggregate) from 31.6 to 44.7. Converting cropland to grassland also enhanced the formation of macroaggregates (>0.25 mm) (from 34.7% to 52.2%) and increased the OC concentrations in density and humic fractions by 48.3%-75.9% within aggregates. But the proportions of OC in density and humic fractions to SOC only increased in macroaggregates in grassland. Alternatively, converting cropland to bareland caused substantial depletion of total SOC, macroaggregates and their associated OC concentrations. The SOC (g kg soil) and mean aggregate associated OC (g kg aggregate) significantly decreased from 31.7 to 25.7 and from 31.6 to 26.2, respectively. While the OC concentration of density and humic fractions within aggregates in bareland did not show significant decreases. Principal component analysis demonstrated that the soils were developed by contrasting land use changes, with the grassland soil being more associated with labile OC fractions within macroaggregats and bareland soil more associated with recalcitrant OC fractions within microaggregates and silt-clay units. These findings highlighted the favorable preservation of plant-derived carbon within soil aggregates, particularly in the labile OC fractions within macroaggregates under high plant inputs with 31 years of grassland conversion. For the cropland and bareland soils without organic inputs, more OC was stabilized within fine aggregates via organo-mineral interactions, tending to be more recalcitrant.
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http://dx.doi.org/10.1038/s41598-020-66038-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7271157PMC
June 2020

Dynamic network connectivity predicts subjective cognitive decline: the Sino-Longitudinal Cognitive impairment and dementia study.

Brain Imaging Behav 2020 Dec;14(6):2692-2707

Department of Biomedical Engineering, School of Life Science, Beijing Institute of technology, 5 South Zhongguancun Street, Beijing, 100081, China.

Subjective cognitive decline (SCD) is the preclinical stage of Alzheimer's disease (AD), the most common neurodegenerative disease in the elderly. We collected resting-state functional MRI data and applied novel graph-theoretical analyses to investigate the dynamic spatiotemporal cerebral connectivities in 63 individuals with SCD and 67 normal controls (NC). Temporal flexibility and spatiotemporal diversity were mapped to reflect dynamic time-varying functional interactions among the brain regions within and outside communities. Temporal flexibility indicates how frequently a brain region interacts with regions of other communities across time; spatiotemporal diversity describes how evenly a brain region interacts with regions belonging to other communities. SCD and NC differed in large-scale brain dynamics characterized by the two measures, which, with support vector machine, demonstrated higher classification accuracies than conventional static parameters and structural metrics. The findings characterize dynamic network dysfunction that may serve as a biomarker of the preclinical stage of AD.
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http://dx.doi.org/10.1007/s11682-019-00220-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7606422PMC
December 2020

Porous Mo-C coverage on ZnO rods for enhanced supercapacitive performance.

Dalton Trans 2020 Apr;49(16):5134-5142

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, PR China.

ZnO is a promising electrode material with advantages such as high environmental benignity, low cost and easy synthesis. Like other non-carbon electrode materials, ZnO has low resistivity and is therefore often combined with carbon materials to obtain favorable electronic conductivity. Herein, ZnO rods were prepared and coated with a carbon layer (Mo-C) as a supercapacitive electrode material for supercapacitors. Particularly, the porosity of the carbon layer is increased by modification with MoO42- which serves as chelating agent during the carbonation of dopamine hydrochloride. Compared to dense carbon coating layers, the porous carbon coverage is more favorable for electrolyte accessibility, thereby simultaneously promoting electronic and ionic transmission to ZnO. With these favorable features, the resultant [email protected] composite displayed outstanding capacitances (900 F g-1 at 1 A g-1) and high rate capability (650 F g-1 at 10 A g-1). In addition, an asymmetric supercapacitor device was constructed using [email protected] and activated carbon as the positive and negative electrodes, respectively, which realized an enlarged voltage profile of 0-1.5 V, stable cyclability with a capacitance retention of 97% and acceptable power/energy densities. Moreover, the method to produce the [email protected] rods is facile and environmentally friendly and can be readily extended to other carbon coated materials.
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http://dx.doi.org/10.1039/d0dt00704hDOI Listing
April 2020

Z-scheme g-CN/BiO[BO(OH)] heterojunction for enhanced photocatalytic CO reduction.

J Colloid Interface Sci 2020 May 11;568:139-147. Epub 2020 Feb 11.

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China.

Construction of Z-scheme heterojunction photocatalyst for CO photoreduction shows great significance as it holds strong redox ability and high charge separation efficiency. In this work, we developed a Z-scheme heterojunction photocatalyst graphitic carbon nitride (g-CN)/basic bismuth borate (BiO[BO(OH)]) by a simple high-energy ball milling method. The structure, surface element distribution and morphology of the composite samples were systematically analyzed. The photocatalytic performance of the samples was surveyed by CO reduction experiment under the simulated solar light irradiation. Almost all the g-CN/BiO[BO(OH)] composites show enhanced photocatalytic activity for converting CO into CO, and the highest CO production rate observed for g-CN/BiO[BO(OH)] (CNBB-3) among all the samples was determined to be approximately 6.09 µmol g h, which is 2.78 times higher that of pristine g-CN. The largely strengthened photocatalytic CO reduction activity mainly originates from the formation of Z-scheme band structures between g-CN and BiO[BO(OH)] benefiting for the efficient charge separation, which was confirmed by the photoeletrochemical, photoluminescence and ESR spectra. This study provides a new reference for fabrication of high-performance Z-scheme photocatalysts for CO reduction.
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http://dx.doi.org/10.1016/j.jcis.2020.02.025DOI Listing
May 2020

Macroscopic Spontaneous Polarization and Surface Oxygen Vacancies Collaboratively Boosting CO Photoreduction on BiOIO Single Crystals.

Adv Mater 2020 Mar 6;32(11):e1908350. Epub 2020 Feb 6.

Beijing Key Laboratory of Materials Utilization of Nonmetallic Mineralsand Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China.

Prompt recombination of photogenerated electrons and holes in bulk and on the surface of photocatalysts harshly impedes the photocatalytic efficiency. However, the simultaneous manipulation of photocharges in the two locations is challenging. Herein, the synchronous promotion of bulk and surface separation of photoinduced charges for prominent CO photoreduction by coupling macroscopic spontaneous polarization and surface oxygen vacancies (OVs) of BiOIO single crystals is reported. The oriented growth of BiOIO single-crystal nanostrips along the [001] direction, ensuing substantial well-aligned IO polar units, renders a large enhancement for the macroscopic polarization electric field, which is capable of driving the rapid separation and migration of charges from bulk to surface. Meanwhile the introduction of surface OVs establishes a local electric field for charge migration to catalytic sites on the surface of BiOIO nanostrips. Highly polarized BiOIO nanostrips with ample OVs demonstrate outstanding CO reduction activity for CO production with a rate of 17.33 µmol g h (approximately ten times enhancement) without any sacrificial agents or cocatalysts, being one of the best CO reduction photocatalysts in the gas-solid system reported so far. This work provides an integrated solution to governing charge movement behavior on the basis of collaborative polarization from bulk and surface.
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http://dx.doi.org/10.1002/adma.201908350DOI Listing
March 2020