Publications by authors named "Chunchen Zhang"

16 Publications

  • Page 1 of 1

Anomalous Superconducting Proximity Effect in Bi Se /FeSe Te Thin-Film Heterojunctions.

Adv Mater 2021 Nov 24:e2107799. Epub 2021 Nov 24.

National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.

Superconducting proximity effect (SPE) induces superconductivity transition in the otherwise non superconducting thin-film in proximity with a superconductor. The SPE usually occurs in real space and decays exponentially with the film thickness. Herein, we unveiled an abnormal SPE in a topological insulator (TI)/superconductor heterostructure, which is attributed to the topologically protected surface state. Surprisingly, such abnormal SPE occurs in momentum space regardless the TI film thickness, as long as the topological surface states are robust and form a continuous conduction loop. Combining transport measurements and scanning tunneling microscopy/spectroscopy techniques, we explored the SPE in Bi Se /FeSe Te heterostructures, where Bi Se is an ideal three-dimensional topological insulator and FeSe Te a typical iron-based superconductor. As the thickness of the Bi Se thin-film exceeds 400 nanometers, there still exits SPE-induced superconductivity on the surface of Bi Se thin-film with a transition temperature T not less than 10 K. Such an extraordinary behavior is induced by the unique properties of topologically protected surface states of Bi Se . This research will deepen the understanding of important role of topologically protected surface states in the SPE. This article is protected by copyright. All rights reserved.
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http://dx.doi.org/10.1002/adma.202107799DOI Listing
November 2021

Hydrogel Loaded with VEGF/TFEB-Engineered Extracellular Vesicles for Rescuing Critical Limb Ischemia by a Dual-Pathway Activation Strategy.

Adv Healthc Mater 2021 Jul 23:e2100334. Epub 2021 Jul 23.

Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Centre for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, P. R. China.

Critical limb ischemia (CLI) is the most severe clinical manifestation of peripheral arterial disease, which causes many amputations and deaths. Conventional treatment strategies for CLI (e.g., stent implantation and vascular surgery) bring surgical risk, which are not suitable for each patient. Extracellular vesicles (EVs) can be a potential solution for CLI. Herein, vascular endothelial growth factor (VEGF; i.e., a crucial molecule related to angiogenesis) and transcription factor EB (TFEB; i.e., a pivotal regulator of autophagy) are chosen as the target gene to improve the bioactivity of EVs derived from endothelial cells. The VEGF/TFEB-engineered EVs (Engineered-EVs) are fabricated by genetically engineering the parent cells, and their versatile functions are confirmed using three cell models (human umbilical vein endothelial cells, myoblast, and monocytes). Injectable thermal-responsive hydrogel are then combined with Engineered-EVs to combat CLI. These results reveal that the hydrogel can enhance the stability of Engineered-EVs in vivo and release EVs at different temperatures. Moreover, the results of animal studies indicate that Engineered-EV/Hydrogel can significantly improve neovascularization, attenuate muscle injury, and recover limb function after CLI. Finally, mechanistic studies shed light on the therapeutic effect of Engineered-EV/Hydrogel due to the activated VEGF/VEGFR pathway and autophagy-lysosomal pathway.
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http://dx.doi.org/10.1002/adhm.202100334DOI Listing
July 2021

Hydrogel-based therapeutic angiogenesis: An alternative treatment strategy for critical limb ischemia.

Biomaterials 2021 07 7;274:120872. Epub 2021 May 7.

Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Centre for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, PR China. Electronic address:

Critical limb ischemia (CLI) is the most severe clinical manifestation of peripheral arterial disease (PAD), resulting in the total or partial loss of limb function. Although the conventional treatment strategy of CLI (e.g., medical treatment and surgery) can improve blood perfusion and restore limb function, many patients are unsuitable for these strategies and they still face the threats of amputation or death. Therapeutic angiogenesis, as a potential solution for these problems, attempts to manipulate blood vessel growth in vivo for augment perfusion without the help of extra pharmaceutics and surgery. With the rise of interdisciplinary research, regenerative medicine strategies provide new possibilities for treating many clinical diseases. Hydrogel, as an excellent biocompatibility material, is an ideal candidate for delivering bioactive molecules and cells for therapeutic angiogenesis. Besides, hydrogel could precisely deliver, control release, and keep the bioactivity of cargos, making hydrogel-based therapeutic angiogenesis a new strategy for CLI therapy. In this review, we comprehensively discuss the approaches of hydrogel-based strategy for CLI treatment as well as their challenges, and future directions.
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http://dx.doi.org/10.1016/j.biomaterials.2021.120872DOI Listing
July 2021

Pinning Effect Enhanced Structural Stability toward a Zero-Strain Layered Cathode for Sodium-Ion Batteries.

Angew Chem Int Ed Engl 2021 Jun 10;60(24):13366-13371. Epub 2021 May 10.

College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.

Layered oxides as the cathode materials of sodium-ion batteries are receiving extensive attention due to their high capacity and flexible composition. However, the layered cathode tends to be thermodynamically and electrochemically unstable during (de)sodiation. Herein, we propose the pinning effect and controllable pinning point in sodium storage layered cathodes to enhance the structural stability and achieve optimal electrochemical performance. 0 %, 2.5 % and 7.3 % transition-metal occupancies in Na-site as pinning points are obtained in Na Mn Co Fe O . 2.5 % Na-site pinned by Fe is beneficial to restrain the potential slab sliding and enhance the structural stability, resulting in an ultra-low volume variation of 0.6 % and maintaining the smooth two-dimensional channel for Na-ion transfer. The Na Mn Co Fe O cathode with the optimal Fe pinning delivers outstanding cycle performance of over 1000 cycles and superior rate capability up to 10 C.
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http://dx.doi.org/10.1002/anie.202100917DOI Listing
June 2021

Nanopharmaceutical-based regenerative medicine: a promising therapeutic strategy for spinal cord injury.

J Mater Chem B 2021 03;9(10):2367-2383

Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Centre for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, P. R. China.

Spinal cord injury (SCI) is a neurological disorder that can lead to loss of perceptive and athletic function due to the severe nerve damage. To date, pieces of evidence detailing the precise pathological mechanisms in SCI are still unclear. Therefore, drug therapy cannot effectively alleviate the SCI symptoms and faces the limitations of systemic administration with large side effects. Thus, the development of SCI treatment strategies is urgent and valuable. Due to the application of nanotechnology in pharmaceutical research, nanopharmaceutical-based regenerative medicine will bring colossal development space for clinical medicine. These nanopharmaceuticals (i.e. nanocrystalline drugs and nanocarrier drugs) are designed using different types of materials or bioactive molecules, so as to improve the therapeutic effects, reduce side effects, and subtly deliver drugs, etc. Currently, an increasing number of nanopharmaceutical products have been approved by drug regulatory agencies, which has also prompted more researchers to focus on the potential treatment strategies of SCI. Therefore, the purpose of this review is to summarize and elaborate the research progress as well as the challenges and future of nanopharmaceuticals in the treatment of SCI, aiming to promote further research of nanopharmaceuticals in SCI.
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http://dx.doi.org/10.1039/d0tb02740eDOI Listing
March 2021

Tunnel Intergrowth Li MnO Nanosheet Arrays as 3D Cathode for High-Performance All-Solid-State Thin Film Lithium Microbatteries.

Adv Mater 2021 Feb 18;33(5):e2003524. Epub 2020 Dec 18.

School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.

All-solid-state thin film lithium batteries (TFBs) are proposed as the ideal power sources for microelectronic devices. However, the high-temperature (>500 °C) annealing process of cathode films, such as LiCoO and LiMn O restricts the on-chip integration and potential applications of TFBs. Herein, tunnel structured Li MnO nanosheet arrays are fabricated as 3D cathode for TFBs by a facile electrolyte Li ion infusion method at very low temperature of 180 °C. Featuring an interesting tunnel intergrowth structure consisting of alternating 1 × 3 and 1 × 2 tunnels, the Li MnO cathode shows high specific capacity with good structural stability between 2.0 and 4.3 V (vs. Li /Li). By utilizing the 3D Li MnO cathode, all-solid-state Li MnO /LiPON/Li TFB (3DLMO-TFB) has been successfully constructed with prominent advantages of greatly enriched cathode/electrolyte interface and shortened Li diffusion length in the 3D structure. Consequently, the 3DLMO-TFB device exhibits large specific capacity (185 mAh g at 50 mA g ), good rate performance, and excellent cycle performance (81.3% capacity retention after 1000 cycles), outperforming the TFBs using spinel LiMn O thin film cathodes fabricated at high temperature. Importantly, the low-temperature preparation of high-performance cathode film enables the fabrication of TFBs on various rigid and flexible substrates, which could greatly expand their potential applications in microelectronics.
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http://dx.doi.org/10.1002/adma.202003524DOI Listing
February 2021

Core-Shell Layered Oxide Cathode for High-Performance Sodium-Ion Batteries.

ACS Appl Mater Interfaces 2020 Feb 28;12(6):7144-7152. Epub 2020 Jan 28.

State Key Laboratory of Powder Metallurgy , Central South University , Changsha , Hunan 410083 , People's Republic of China.

Sodium layered oxides are considered to be cathode candidates with the most potential for large-scale energy storage because of their high reversible capacity and wide availability of sodium resources. A significant hurdle to wide application of these layered oxides lies in simultaneously satisfying high-energy density and long cycle life because of the intrinsic problems associated with their structural irreversibility. Herein, a O3/O'3-P2 core-shell composite that integrates a high specific capacity from O-type Ni-based core and good structural stability from P2-type Mn-rich shell is presented. Multiscale electron microscopy and affiliated spectroscopy analyses reveal that, in addition to the microscale O3/O'3-P2 core-shell structure, a nanoscale coherent P2/O3 intergrown structure can also be identified in the composite. Such well-tailored structures not only constrain the structural damages (microscale cracks) induced by repeated volumetric changes upon desodiation and resodiation but also facilitate fast Na ions diffusion through the exterior P2-type layered structure. This work may provide new clues into the design of high-performance cathode materials for sodium-ion batteries.
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http://dx.doi.org/10.1021/acsami.9b19260DOI Listing
February 2020

Electrochemical and Structural Analysis in All-Solid-State Lithium Batteries by Analytical Electron Microscopy: Progress and Perspectives.

Adv Mater 2020 Jul 29;32(27):e1903747. Epub 2019 Oct 29.

National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.

Advanced scanning transmission electron microscopy (STEM) and its associated instruments have made significant contributions to the characterization of all-solid-state (ASS) Li batteries, as these tools provide localized information on the structure, morphology, chemistry, and electronic state of electrodes, electrolytes, and their interfaces at the nano- and atomic scale. Furthermore, the rapid development of in situ techniques has enabled a deep understanding of interfacial dynamic behavior and heterogeneous characteristics during the cycling process. However, due to the beam-sensitive nature of light elements in the interphases, e.g., Li and O, thorough and reliable studies of the interfacial structure and chemistry at an ultrahigh spatial resolution without beam damage is still a formidable challenge. Herein, the following points are discussed: (1) the recent contributions of advanced STEM to the study of ASS Li batteries; (2) current challenges associated with using this method; and (3) potential opportunities for combining cryo-electron microscopy and the STEM phase contrast imaging techniques.
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http://dx.doi.org/10.1002/adma.201903747DOI Listing
July 2020

Precision Printing of Customized Cylindrical Capsules with Multifunctional Layers for Oral Drug Delivery.

ACS Appl Mater Interfaces 2019 Oct 9;11(42):39179-39191. Epub 2019 Oct 9.

Key Laboratory for Biomedical Engineering of Education Ministry of China , Hangzhou 310027 , PR China.

Advances in personalized medicine will require custom drug formulations and delivery mechanisms. Herein, we demonstrate a new type of personalized capsule comprising of printed concentric cylindrical layers with each layer having a distinctive functional drug component. Poly ε-caprolactone (PCL) with paracetamol (APAP) and chlorpheniramine maleate (CM), synergistic drugs commonly used to alleviate influenza symptoms, are printed as an inner layer and outer layer, respectively, via microscaled electrohydrodynamic (EHD) printing. Polyvinylpyrrolidone (PVP) nanofibers are embedded as interlayers between the two printed PCL-drug layers using electrospinning (ES) techniques. The complete concentric cylindrical capsule with a 6 mm inner diameter and 15 mm length can be swallowed for oral drug delivery. After dissolution of the PVP interlayer, the capsule separates in two, with inner and outer capsules for continuous drug dosing and targeting. Imaging was achieved using a 3T MRI system which allowed temporal observations of the targeted release through the incorporation of nanoparticles (FeO). The morphology and structure, chemical composition, mechanical properties, and biocompatibility of the capsules were studied in vitro. In summary, this new type of custom printed and electrospun capsule that enabled component separation, targeted drug release may advance personalized medicine via multidrug oral delivery.
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http://dx.doi.org/10.1021/acsami.9b13568DOI Listing
October 2019

Freestanding crystalline oxide perovskites down to the monolayer limit.

Nature 2019 06 5;570(7759):87-90. Epub 2019 Jun 5.

National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, China.

Two-dimensional (2D) materials such as graphene and transition-metal dichalcogenides reveal the electronic phases that emerge when a bulk crystal is reduced to a monolayer. Transition-metal oxide perovskites host a variety of correlated electronic phases, so similar behaviour in monolayer materials based on transition-metal oxide perovskites would open the door to a rich spectrum of exotic 2D correlated phases that have not yet been explored. Here we report the fabrication of freestanding perovskite films with high crystalline quality almost down to a single unit cell. Using a recently developed method based on water-soluble SrAlO as the sacrificial buffer layer we synthesize freestanding SrTiO and BiFeO ultrathin films by reactive molecular beam epitaxy and transfer them to diverse substrates, in particular crystalline silicon wafers and holey carbon films. We find that freestanding BiFeO films exhibit unexpected and giant tetragonality and polarization when approaching the 2D limit. Our results demonstrate the absence of a critical thickness for stabilizing the crystalline order in the freestanding ultrathin oxide films. The ability to synthesize and transfer crystalline freestanding perovskite films without any thickness limitation onto any desired substrate creates opportunities for research into 2D correlated phases and interfacial phenomena that have not previously been technically possible.
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http://dx.doi.org/10.1038/s41586-019-1255-7DOI Listing
June 2019

Porous Yolk-Shell Particle Engineering via Nonsolvent-Assisted Trineedle Coaxial Electrospraying for Burn-Related Wound Healing.

ACS Appl Mater Interfaces 2019 Feb 19;11(8):7823-7835. Epub 2019 Feb 19.

Leicester School of Pharmacy , De Montfort University , The Gateway, Leicester LE1 9BH , U.K.

Yolk-shell particles (YSPs) have attracted increasing attention from various research fields because of their low density, large surface area, and excellent loading capacity. However, the fabrication of polymer-based porous YSPs remains a great challenge. In this work, multifunctional polycaprolactone YSPs were produced using trineedle coaxial electrospraying with a simple nonsolvent process. TiO-Ag nanoparticles and Ganoderma lucidum polysaccharides (GLPs) were encapsulated into the outer shell of the YSPs as the major antibacterial and antioxidant components, whereas iron oxide (FeO) nanoparticles were incorporated into the inner core to act as a photothermal agent. The morphology and structure, chemical composition, biocompatibility, antioxidant, and antibacterial effects of the fabricated YSPs, photothermal effects, and the release profile of the encapsulated GLP were studied in vitro. Furthermore, the in vivo wound healing effects of the YSPs and the laser-assisted therapy were explored based on a burn wound model on c57 mice.
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http://dx.doi.org/10.1021/acsami.8b22112DOI Listing
February 2019

Pharmacological effects of natural Ganoderma and its extracts on neurological diseases: A comprehensive review.

Int J Biol Macromol 2019 Jan 18;121:1160-1178. Epub 2018 Oct 18.

Key Laboratory for Biomedical Engineering of Education Ministry of China, Zhejiang University, Hang Zhou, 310027, PR China; Zhejiang Provincial Key Laboratory of Cardio Cerebral Vascular Detection Technology and Medicinal Effectiveness Appraisal, Zhejiang University, Hangzhou 310027, PR China. Electronic address:

Ganoderma, has been used for clinical applications for thousands of years as a highly-nutritious and significantly-effective medicinal herb. The active components and efficacy of Ganoderma are constantly being explored and supplemented every year. In recent years, more and more literature has reported the pharmacological effects of Ganoderma on anti-tumor, liver protection and immunity enhancement, especially on neuroprotection. Numerous research works on the neuroprotective effects of Ganoderma have been documented (e.g., modulation of neurogenesis, amelioration of Alzheimer's disease, therapeutic effect on epilepsy, the protective effect on neural cells in stroke injury, etc.) thus it has drawn increasing attention. However, an integrated and comprehensive review of recent research findings has not been detailed in any great depth. Therefore, the purpose of this review is to summarize and elucidate recent progress of neuroprotective effects of natural Ganoderma and its extracts.
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http://dx.doi.org/10.1016/j.ijbiomac.2018.10.076DOI Listing
January 2019

Synthesis of Mesoporous Co₃O₄/NiCo₂O₄ Nanorods and Their Electrochemical Study.

J Nanosci Nanotechnol 2019 Jan;19(1):47-56

College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, P. R. China.

Mesoporous Co₃O₄/NiCo₂O₄ nanorods were obtained by a hydrothermal reaction with the assistance of Ni foam and subsequent annealing treatment. The characterization of this composition by X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, energy dispersive spectra and Brunauer-Emmett-Teller analysis revealed that the nanorods consisted of Co₃O₄ and NiCo₂O₄ phase, exhibiting high porosity and rich crystal defects. The electrochemical data showed a specific capacitance of 1173 mF cm and 606 mF cm at 2 mV s and 1 mA cm, respectively. Its cycling performance was 83.9% at 3 mA cm after 4000 cycles. Furthermore, the asymmetric supercapacitor Co₃O₄/NiCo₂O₄//AC delivered an energy density of 11.7 W h kg and power density of 760 W kg.
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http://dx.doi.org/10.1166/jnn.2019.16448DOI Listing
January 2019

Targeting oxidative stress using tri-needle electrospray engineered Ganoderma lucidum polysaccharide-loaded porous yolk-shell particles.

Eur J Pharm Sci 2018 Dec 21;125:64-73. Epub 2018 Sep 21.

Key Laboratory for Biomedical Engineering of Education, Ministry of China, Zhejiang University, Hangzhou 310027, PR China; Zhejiang Provincial Key Laboratory of Cardio-Cerebral Vascular Detection Technology and Medicinal Effectiveness Appraisal, Zhejiang University, Hangzhou 310027, PR China. Electronic address:

Chronic lung diseases (e.g. chronic obstructive pulmonary disease and asthma) are associated with oxidative stress and common treatments include various types of inhalation therapies. In this work Ganoderma lucidum polysaccharide (GLP), a naturally occurring antioxidant is loaded into porous Poly (ε-caprolactone) (PCL) particles using a single step tri-needle coaxial electrospray process (Tri-needle CES); with a view to develop therapies to combat oxidative stress. Based on the core-shell structure of porous yolk shell particles (YSPs), GLP-loaded YSPs displayed a bi-phasic release pattern. In vitro cell studies indicate GLP-loaded porous YSPs display good biocompatibility and positive attributes towards HO-induced oxidative stress in MRC-5 cells and dramatically attenuate intracellular reactive oxygen species (ROS) levels as well as significantly increase cell viability. In vivo inhalation studies indicate that GLP-loaded porous YSPs can be delivered to deep lung tissue and remain deposited for over 48 h and are subsequently removed by natural clearance mechanisms. Based on current findings GLP-loaded porous YSPs are suitable for pulmonary delivery and display good inhalation therapy potential to treat chronic lung diseases.
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http://dx.doi.org/10.1016/j.ejps.2018.09.016DOI Listing
December 2018

Tri-Needle Coaxial Electrospray Engineering of Magnetic Polymer Yolk-Shell Particles Possessing Dual-Imaging Modality, Multiagent Compartments, and Trigger Release Potential.

ACS Appl Mater Interfaces 2017 Jun 15;9(25):21485-21495. Epub 2017 Jun 15.

Leicester School of Pharmacy, De Montfort University , The Gateway, Leicester LE1 9BH, U.K.

Particulate platforms capable of delivering multiple actives as well as providing diagnostic features have gained considerable interest over the last few years. In this study, magnetic polymer yolk-shell particles (YSPs) were engineered using a tri-needle coaxial electrospraying technique enabling dual-mode (ultrasonic and magnetic resonance) imaging capability with specific multidrug compartments via an advanced single-step encapsulation process. YSPs comprised magnetic FeO nanoparticles (MNPs) embedded in the polymeric shell, an interfacing oil layer, and a polymeric core (i.e., composite shell-oil interface-polymeric core). The frequency of the ultrasound backscatter signal was modulated through YSP loading dosage, and both T- and T-weighted magnetic resonance imaging signal intensities were shown to decrease with increasing MNP content (YSP outer shell). Three fluorescent dyes (selected as model probes with varying hydrophobicities) were coencapsulated separately to confirm the YSP structure. Probe release profiles were tuned by varying power or frequency of an external auxiliary magnetic field (AMF, 0.7 mT (LAMF) or 1.4 mT (HAMF)). In addition, an "inversion" phenomenon for the AMF-enhanced drug release process was studied and is reported. A low YSP cytotoxicity (5 mg/mL) and biocompatibility (murine, L929) was confirmed. In summary, magnetic YSPs demonstrate timely potential as multifunctional theranostic agents for dual-imaging modality and magnetically controlled coactive delivery.
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http://dx.doi.org/10.1021/acsami.7b05580DOI Listing
June 2017

A simple synthesis of hollow Mn2O3 core-shell microspheres and their application in lithium ion batteries.

Phys Chem Chem Phys 2016 Feb;18(6):4739-44

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, P. R. China.

Hollow Mn2O3 core-shell microspheres were successfully fabricated via a mixed method including a solution method and a subsequent thermal decomposition. Transmission electron microscopy showed that the average size of Mn2O3 cores was about 0.8 μm and their shell thickness was 120 nm. These hollow Mn2O3 core-shell microspheres as anode materials exhibited a high specific capacity of up to 620 mA h g(-1) with a good cycling performance (500 cycles), indicating that the hollow Mn2O3 core-shell microsphere material was a promising anode candidate for a high-capacity, low-cost, and environment-friendly lithium ion battery. The formation mechanism was studied in detail.
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http://dx.doi.org/10.1039/c5cp07301dDOI Listing
February 2016
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