Design of a novel carbon/BiOBr nanosheet photoanode and its photoelectrochemical application
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Design of a novel carbon/BiOBr nanosheet photoanode and its photoelectrochemical application Jun Shang1,2,3,*
, Yanjun Gao1, Bing Zhao1, Shiqi Shen1, and Xianwei Wang2,3,*
1
National Demonstration Center for Experimental Physics Education, Henan Normal University, Xinxiang 453007, China Laboratory of Functional Materials, College of Physics, Henan Normal University, Xinxiang 453007, China 3 Henan Key Laboratory of Photovoltaic Materials, Xinxiang 453007, China 2
Received: 3 July 2020
ABSTRACT
Accepted: 3 October 2020
A novel carbon/BiOBr (C/BiOBr) photoanode with interesting electronic structure is designed. Carbon atoms are connected with bismuth (Bi) and bromine (Br) atoms by electron interaction. Such an electron interaction changes the chemical environments of Bi and Br, so that results in enhanced visible light absorption capacity and high transfer rate of charge carriers. Photoelectrochemical cell (PEC) system has been constructed to study the photoelectrochemical property of C/BiOBr photoanode. The short-circuit current (Jsc) and open-circuit voltage (Voc) of C/BiOBr are measured to be 0.057 mA/cm2 and 0.296 V, which are higher than that in PEC with the pristine BiOBr photoanode. The proposed chemically bonded C/BiOBr photoanode offers potential for electricity generation and pollutants degradation.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction In recent years, as a result of large energy consumption of the traditional fossil fuels such as coal, crude oil, and so on, human beings are threatened by a great energy crisis and environmental pollution issues. Photoelectrochemical cells (PECs) convert solar energy directly into electrical energy and have been intensively probed. In addition to having a clean and unlimited supply of solar energy, its fascination also lies in its enormous potential to link and deal with environmental and energy issues. Recovering
the energy released during the degradation of organic pollutants has proved to be promising [1]. Recently, much work has focused on the PEC devices constructed with TiO2 semiconductor materials, having achieved remarkable achievement under UV light. Unfortunately, the existence of surface states and the limited visible light collection seriously hinder its widespread application [2, 3]. As a new class of visible light active semiconductors, bismuth oxyhalides BiOX (X = Cl, Br, I) perform even better because they are non-toxic, have stable chemical properties and possess a noteworthy optical property [4]. They have been extensively investigated for making the best use of the visible light, which can
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https://doi.org/10.1007/s10854-020-04599-7
J Mater Sci: Mater Electron
achieve superior energy conservation and photocatalytic energy conversion. Recently, compared to the traditional photoanode, BiOX photoanode is found to show better performance in PEC. Chenggang Niu and co-workers selected the Cr and Ag co-modified BiOCl as photoanod
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