The self-passivation mechanism in degradation of BiVO4 photoanode
BiVO4 is a promising photoanode material for solar-assisted water splitting in a photoelectrochemical cell but has a propensity to degrade. Investigations carried out here in 0.1 M Na2SO4 electrolyte showed that degradation is by dissolution of V in the electrolyte while Bi is retained on the anode...
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sg-ntu-dr.10356-1419902023-07-14T15:58:34Z The self-passivation mechanism in degradation of BiVO4 photoanode Yao, Xin Zhao, Xin Hu, Jun Xie, Huiqing Wang, Danping Cao, Xun Zhang, Zheng Huang, Yizhong Chen, Zhong Sritharan, Thirumany School of Materials Science and Engineering Singapore-Berkeley Research Initiative for Sustainable Energy Engineering::Materials Electrochemical Energy Storage Electrochemical Energy Conversion BiVO4 is a promising photoanode material for solar-assisted water splitting in a photoelectrochemical cell but has a propensity to degrade. Investigations carried out here in 0.1 M Na2SO4 electrolyte showed that degradation is by dissolution of V in the electrolyte while Bi is retained on the anode probably in the form of solid Bi oxide (Bi2O3, Bi4O7). Accumulation of Bi oxide on the anode surface leads to passivation from further degradation. Thermodynamic modeling of possible degradation reactions has provided theoretical support to this mechanism. This self-passivation is accompanied by a decrease in photocurrent density, but it protects the anode against extensive photocorrosion and contributes to long-term stability. This is a more definitive understanding of degradation of BiVO4 during water splitting in a photoelectrochemical cell. This understanding is imperative for both fundamental and applied research. NRF (Natl Research Foundation, S’pore) Published version 2020-06-15T00:55:15Z 2020-06-15T00:55:15Z 2019 Journal Article Yao, X., Zhao, X., Hu, J., Xie, H., Wang, D., Cao, X., . . . Sritharan, T. (2019). The self-passivation mechanism in degradation of BiVO4 photoanode. iScience, 19, 976-985. doi:10.1016/j.isci.2019.08.037 2589-0042 https://hdl.handle.net/10356/141990 10.1016/j.isci.2019.08.037 31522120 2-s2.0-85071972132 19 976 985 en iScience © 2019 The Author(s). Published under Cell Press. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). application/pdf |
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Engineering::Materials Electrochemical Energy Storage Electrochemical Energy Conversion Yao, Xin Zhao, Xin Hu, Jun Xie, Huiqing Wang, Danping Cao, Xun Zhang, Zheng Huang, Yizhong Chen, Zhong Sritharan, Thirumany The self-passivation mechanism in degradation of BiVO4 photoanode |
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BiVO4 is a promising photoanode material for solar-assisted water splitting in a photoelectrochemical cell but has a propensity to degrade. Investigations carried out here in 0.1 M Na2SO4 electrolyte showed that degradation is by dissolution of V in the electrolyte while Bi is retained on the anode probably in the form of solid Bi oxide (Bi2O3, Bi4O7). Accumulation of Bi oxide on the anode surface leads to passivation from further degradation. Thermodynamic modeling of possible degradation reactions has provided theoretical support to this mechanism. This self-passivation is accompanied by a decrease in photocurrent density, but it protects the anode against extensive photocorrosion and contributes to long-term stability. This is a more definitive understanding of degradation of BiVO4 during water splitting in a photoelectrochemical cell. This understanding is imperative for both fundamental and applied research. |
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School of Materials Science and Engineering |
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School of Materials Science and Engineering Yao, Xin Zhao, Xin Hu, Jun Xie, Huiqing Wang, Danping Cao, Xun Zhang, Zheng Huang, Yizhong Chen, Zhong Sritharan, Thirumany |
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Article |
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Yao, Xin Zhao, Xin Hu, Jun Xie, Huiqing Wang, Danping Cao, Xun Zhang, Zheng Huang, Yizhong Chen, Zhong Sritharan, Thirumany |
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Yao, Xin |
title |
The self-passivation mechanism in degradation of BiVO4 photoanode |
title_short |
The self-passivation mechanism in degradation of BiVO4 photoanode |
title_full |
The self-passivation mechanism in degradation of BiVO4 photoanode |
title_fullStr |
The self-passivation mechanism in degradation of BiVO4 photoanode |
title_full_unstemmed |
The self-passivation mechanism in degradation of BiVO4 photoanode |
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self-passivation mechanism in degradation of bivo4 photoanode |
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2020 |
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https://hdl.handle.net/10356/141990 |
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1773551255239524352 |