An investigation on the role of W doping in BiVO 4 photoanodes used for solar water splitting

n-Type doping has been widely employed to enhance the performance of a photoanode in a photoelectrochemical cell used for water splitting. However, little is known about how doping affects the catalytic activity during surface catalysis. Herein, we took BiVO4 as an example to investigate the effect...

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Main Authors: Zhao, Xin, Hu, Jun, Chen, Shi, Chen, Zhong
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2019
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Online Access:https://hdl.handle.net/10356/106075
http://hdl.handle.net/10220/48890
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1060752023-02-28T19:43:46Z An investigation on the role of W doping in BiVO 4 photoanodes used for solar water splitting Zhao, Xin Hu, Jun Chen, Shi Chen, Zhong School of Materials Science & Engineering School of Physical and Mathematical Sciences W Doping BiVO4 DRNTU::Engineering::Materials n-Type doping has been widely employed to enhance the performance of a photoanode in a photoelectrochemical cell used for water splitting. However, little is known about how doping affects the catalytic activity during surface catalysis. Herein, we took BiVO4 as an example to investigate the effect of doping on surface catalysis from both experimental and theoretical perspectives. To enable an impartial comparison, we have prepared planar BiVO4 thin films with and without W doping. It was found that W doping had no obvious effect on the morphology, crystallinity, and light absorption of the film; however, the photocurrent was significantly enhanced upon W doping. This enhancement is contributed by two important factors: better charge separation efficiency and improved surface charge transfer efficiency. Electrochemical analysis reveals that W doping lowers the surface charge transfer resistance and forms active surface states, facilitating charge transfer. Theoretical analysis shows that W doping activates the V atoms to be reactive sites. Moreover, the adsorption energies and distance between adsorption species (OHads, Oads, and OOHads) involved in the water splitting process become more favorable for surface charge transfer. The current study provides an insight into the roles of W doping in BiVO4, especially during surface catalysis. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Accepted version 2019-06-21T01:08:53Z 2019-12-06T22:04:08Z 2019-06-21T01:08:53Z 2019-12-06T22:04:08Z 2018 Journal Article Zhao, X., Hu, J., Chen, S., & Chen, Z. (2018). An investigation on the role of W doping in BiVO4 photoanodes used for solar water splitting. Physical Chemistry Chemical Physics, 20(19), 13637-13645. doi:10.1039/C8CP01316K 1463-9076 https://hdl.handle.net/10356/106075 http://hdl.handle.net/10220/48890 10.1039/C8CP01316K en Physical Chemistry Chemical Physics © 2018 Owner Societies. All rights reserved. This paper was published in Physical Chemistry Chemical Physics and is made available with permission of Owner Societies. 21 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic W Doping
BiVO4
DRNTU::Engineering::Materials
spellingShingle W Doping
BiVO4
DRNTU::Engineering::Materials
Zhao, Xin
Hu, Jun
Chen, Shi
Chen, Zhong
An investigation on the role of W doping in BiVO 4 photoanodes used for solar water splitting
description n-Type doping has been widely employed to enhance the performance of a photoanode in a photoelectrochemical cell used for water splitting. However, little is known about how doping affects the catalytic activity during surface catalysis. Herein, we took BiVO4 as an example to investigate the effect of doping on surface catalysis from both experimental and theoretical perspectives. To enable an impartial comparison, we have prepared planar BiVO4 thin films with and without W doping. It was found that W doping had no obvious effect on the morphology, crystallinity, and light absorption of the film; however, the photocurrent was significantly enhanced upon W doping. This enhancement is contributed by two important factors: better charge separation efficiency and improved surface charge transfer efficiency. Electrochemical analysis reveals that W doping lowers the surface charge transfer resistance and forms active surface states, facilitating charge transfer. Theoretical analysis shows that W doping activates the V atoms to be reactive sites. Moreover, the adsorption energies and distance between adsorption species (OHads, Oads, and OOHads) involved in the water splitting process become more favorable for surface charge transfer. The current study provides an insight into the roles of W doping in BiVO4, especially during surface catalysis.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Zhao, Xin
Hu, Jun
Chen, Shi
Chen, Zhong
format Article
author Zhao, Xin
Hu, Jun
Chen, Shi
Chen, Zhong
author_sort Zhao, Xin
title An investigation on the role of W doping in BiVO 4 photoanodes used for solar water splitting
title_short An investigation on the role of W doping in BiVO 4 photoanodes used for solar water splitting
title_full An investigation on the role of W doping in BiVO 4 photoanodes used for solar water splitting
title_fullStr An investigation on the role of W doping in BiVO 4 photoanodes used for solar water splitting
title_full_unstemmed An investigation on the role of W doping in BiVO 4 photoanodes used for solar water splitting
title_sort investigation on the role of w doping in bivo 4 photoanodes used for solar water splitting
publishDate 2019
url https://hdl.handle.net/10356/106075
http://hdl.handle.net/10220/48890
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