Cargando…

The Self-Passivation Mechanism in Degradation of BiVO(4) Photoanode

BiVO(4) 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 Na(2)SO(4) electrolyte showed that degradation is by dissolution of V in the electrolyte while Bi is retained on the...

Descripción completa

Detalles Bibliográficos
Autores principales: Yao, Xin, Zhao, Xin, Hu, Jun, Xie, Huiqing, Wang, Danping, Cao, Xun, Zhang, Zheng, Huang, Yizhong, Chen, Zhong, Sritharan, Thirumany
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6744392/
https://www.ncbi.nlm.nih.gov/pubmed/31522120
http://dx.doi.org/10.1016/j.isci.2019.08.037
_version_ 1783451359078514688
author Yao, Xin
Zhao, Xin
Hu, Jun
Xie, Huiqing
Wang, Danping
Cao, Xun
Zhang, Zheng
Huang, Yizhong
Chen, Zhong
Sritharan, Thirumany
author_facet Yao, Xin
Zhao, Xin
Hu, Jun
Xie, Huiqing
Wang, Danping
Cao, Xun
Zhang, Zheng
Huang, Yizhong
Chen, Zhong
Sritharan, Thirumany
author_sort Yao, Xin
collection PubMed
description BiVO(4) 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 Na(2)SO(4) 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 (Bi(2)O(3), Bi(4)O(7)). 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 BiVO(4) during water splitting in a photoelectrochemical cell. This understanding is imperative for both fundamental and applied research.
format Online
Article
Text
id pubmed-6744392
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher Elsevier
record_format MEDLINE/PubMed
spelling pubmed-67443922019-09-18 The Self-Passivation Mechanism in Degradation of BiVO(4) Photoanode Yao, Xin Zhao, Xin Hu, Jun Xie, Huiqing Wang, Danping Cao, Xun Zhang, Zheng Huang, Yizhong Chen, Zhong Sritharan, Thirumany iScience Article BiVO(4) 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 Na(2)SO(4) 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 (Bi(2)O(3), Bi(4)O(7)). 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 BiVO(4) during water splitting in a photoelectrochemical cell. This understanding is imperative for both fundamental and applied research. Elsevier 2019-08-27 /pmc/articles/PMC6744392/ /pubmed/31522120 http://dx.doi.org/10.1016/j.isci.2019.08.037 Text en © 2019 The Author(s) http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Article
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 BiVO(4) Photoanode
title The Self-Passivation Mechanism in Degradation of BiVO(4) Photoanode
title_full The Self-Passivation Mechanism in Degradation of BiVO(4) Photoanode
title_fullStr The Self-Passivation Mechanism in Degradation of BiVO(4) Photoanode
title_full_unstemmed The Self-Passivation Mechanism in Degradation of BiVO(4) Photoanode
title_short The Self-Passivation Mechanism in Degradation of BiVO(4) Photoanode
title_sort self-passivation mechanism in degradation of bivo(4) photoanode
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6744392/
https://www.ncbi.nlm.nih.gov/pubmed/31522120
http://dx.doi.org/10.1016/j.isci.2019.08.037
work_keys_str_mv AT yaoxin theselfpassivationmechanismindegradationofbivo4photoanode
AT zhaoxin theselfpassivationmechanismindegradationofbivo4photoanode
AT hujun theselfpassivationmechanismindegradationofbivo4photoanode
AT xiehuiqing theselfpassivationmechanismindegradationofbivo4photoanode
AT wangdanping theselfpassivationmechanismindegradationofbivo4photoanode
AT caoxun theselfpassivationmechanismindegradationofbivo4photoanode
AT zhangzheng theselfpassivationmechanismindegradationofbivo4photoanode
AT huangyizhong theselfpassivationmechanismindegradationofbivo4photoanode
AT chenzhong theselfpassivationmechanismindegradationofbivo4photoanode
AT sritharanthirumany theselfpassivationmechanismindegradationofbivo4photoanode
AT yaoxin selfpassivationmechanismindegradationofbivo4photoanode
AT zhaoxin selfpassivationmechanismindegradationofbivo4photoanode
AT hujun selfpassivationmechanismindegradationofbivo4photoanode
AT xiehuiqing selfpassivationmechanismindegradationofbivo4photoanode
AT wangdanping selfpassivationmechanismindegradationofbivo4photoanode
AT caoxun selfpassivationmechanismindegradationofbivo4photoanode
AT zhangzheng selfpassivationmechanismindegradationofbivo4photoanode
AT huangyizhong selfpassivationmechanismindegradationofbivo4photoanode
AT chenzhong selfpassivationmechanismindegradationofbivo4photoanode
AT sritharanthirumany selfpassivationmechanismindegradationofbivo4photoanode