Publications by authors named "Wenbo Pi"

5 Publications

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Corrigendum to "Fabrication of BiFeO-g-CN-WO Z-scheme heterojunction as highly efficient visible-light photocatalyst for water reduction and 2,4-dichlorophenol degradation: Insight mechanism" [J. Hazard. Mater. 397 (2020) 122708].

J Hazard Mater 2021 Aug 7;421:126772. Epub 2021 Aug 7.

Engineering Research Center for Functional Ceramics of the Ministry of Education, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR China; China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074, PR China.

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http://dx.doi.org/10.1016/j.jhazmat.2021.126772DOI Listing
August 2021

A rational design of g-CN-based ternary composite for highly efficient H generation and 2,4-DCP degradation.

J Colloid Interface Sci 2021 Oct 20;599:484-496. Epub 2021 Apr 20.

Engineering Research Center for Functional Ceramics of the Ministry of Education, School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China; Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China. Electronic address:

In this work, g-CN based ternary composite (CeO/CN/NH-MIL-101(Fe)) has been fabricated via hydrothermal and wet-chemical methods. The composite showed superior photoactivities for HO reduction to produce H and 2,4-dichlorophenol (2,4-DCP) degradation. The amount of H evolved over the composite under visible and UV-visible irradiations is 147.4 µmol·g·h and 556.2 µmol·g·h, respectively. Further, the photocatalyst degraded 87% of 2,4-DCP in 2 hrs under visible light irradiations. The improved photoactivities are accredited to the synergistic-effects caused by the proper band alignment with close interfacial contact of the three components that significantly promoted charge transfer and separation. The 2,4-DCP degradation over the composite is dominated by OH radical rather than h and O as investigated by scavenger trapping experiments. This is further supported by the electron para-magnetic resonance (EPR) study. This work provides new directions for the development of g-CN based highly efficient ternary composite materials for clean energy generation and pollution control.
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http://dx.doi.org/10.1016/j.jcis.2021.04.049DOI Listing
October 2021

Fabrication of BiFeO-g-CN-WO Z-scheme heterojunction as highly efficient visible-light photocatalyst for water reduction and 2,4-dichlorophenol degradation: Insight mechanism.

J Hazard Mater 2020 Oct 20;397:122708. Epub 2020 Apr 20.

Engineering Research Center for Functional Ceramics of the Ministry of Education, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR China; China-EU Institute for Clean and Renewable Energy, HuazhongUniversity of Science and Technology, Wuhan 430074, PR China. Electronic address:

In this work, a Z-scheme BiFeO-g-CN-WO (BFO-CN-WO) photocatalyst has been synthesized via a wet chemical method and utilized in photocatalysis for hydrogen generation and 2,4-dichlorophenol (2,4-DCP) degradation under visible light irradiation. The resultant photocatalyst showed 90 μmol·h g H evolution activity and 63% 2,4-DCP degradation performance, which is 12 and 4.2 times higher than the pristine g-CN respectively. The fascinating photocatalytic performance is attributed to the strong interfacial contact between g-CN and the coupled BiFeO and WO component, which greatly improved the visible light absorption and charge carriers' separation. The designed Z-scheme heterojunction is a successful strategy for enhancing the separation efficiency of photo-induced charge carriers at the interface while retaining outstanding redox ability. During 2,4-DCP degradation, LC/MS technique was used to detect the reaction intermediates. According to the LC/MS results, several new intermediates such as 2,3-dichloro-6-(2,4-dichlorophenoxy)phenol (m/z = 306), 2,4-dichlorophenyl hydrogen carbonate (m/z = 207), 2,4-dichlorobenzen-1,3-diol (m/z = 177) and phenyl hydrogen carbonate (m/z = 137) were detected. Based on these intermediates, 2,4-DCP degradation pathway is proposed. The fluorescence (FL) and electron paramagnetic resonance (EPR) results reveal that the •OH plays an important role in the 2,4-DCP degradation. The fabricated photocatalyst can be utilized in the field of photocatalysis for practical applications.
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http://dx.doi.org/10.1016/j.jhazmat.2020.122708DOI Listing
October 2020

Experimental and DFT Studies of Au Deposition Over WO/g-CN Z-Scheme Heterojunction.

Nanomicro Lett 2019 Dec 19;12(1). Epub 2019 Dec 19.

Engineering Research Center for Functional Ceramics of the Ministry of Education, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, People's Republic of China.

A typical Z-scheme system is composed of two photocatalysts which generate two sets of charge carriers and split water into H and O at different locations. Scientists are struggling to enhance the efficiencies of these systems by maximizing their light absorption, engineering more stable redox couples, and discovering new O and H evolutions co-catalysts. In this work, Au decorated WO/g-CN Z-scheme nanocomposites are fabricated via wet-chemical and photo-deposition methods. The nanocomposites are utilized in photocatalysis for H production and 2,4-dichlorophenol (2,4-DCP) degradation. It is investigated that the optimized 4Au/6% WO/CN nanocomposite is highly efficient for production of 69.9 and 307.3 µmol h g H gas, respectively, under visible-light (λ > 420 nm) and UV-visible illumination. Further, the fabricated 4Au/6% WO/CN nanocomposite is significant (i.e., 100% degradation in 2 h) for 2,4-DCP degradation under visible light and highly stable in photocatalysis. A significant 4.17% quantum efficiency is recorded for H production at wavelength 420 nm. This enhanced performance is attributed to the improved charge separation and the surface plasmon resonance effect of Au nanoparticles. Solid-state density functional theory simulations are performed to countercheck and validate our experimental data. Positive surface formation energy, high charge transfer, and strong non-bonding interaction via electrostatic forces confirm the stability of 4Au/6% WO/CN interface.
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http://dx.doi.org/10.1007/s40820-019-0345-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7770730PMC
December 2019

A BiTe Topological Insulator as a New and Outstanding Counter Electrode Material for High-Efficiency and Endurable Flexible Perovskite Solar Cells.

ACS Appl Mater Interfaces 2019 Dec 17;11(51):47868-47877. Epub 2019 Dec 17.

School of Optical and Electronic Information, Engineering Research Center for Functional Ceramics of the Ministry of Education , Huazhong University of Science and Technology , Wuhan 430074 , P. R. China.

Inverted flexible perovskite solar cells (PSCs) typically employ expensive metals as the counter electrodes, which are brittle and corrodible by perovskite, leading to a sharp performance drop under continuous bending, air exposure, thermal stress, or light illumination and eventually retard the commercialization. Herein, a low-cost BiTe counter electrode was employed by using a simple thermal evaporation process. The resultant device achieved an excellent power conversion efficiency of 18.16%, which was among the highest reported efficiencies, much higher than the reference Ag PSC (15.90%). The improvement should be attributed to the intrinsic suppressed electron backscattering in a BiTe topological insulator. Simultaneously, the BiTe device obtained a significantly improved mechanical flexibility and long-term operational stability. The present strategy will help to open up a new avenue for future commercialization of flexible photovoltaic applications.
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http://dx.doi.org/10.1021/acsami.9b15320DOI Listing
December 2019
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