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...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/106075 http://hdl.handle.net/10220/48890 |
| _version_ | 1824455051224023040 |
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| author | Zhao, Xin Hu, Jun Chen, Shi Chen, Zhong |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Zhao, Xin Hu, Jun Chen, Shi Chen, Zhong |
| author_sort | Zhao, Xin |
| collection | NTU |
| 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. |
| first_indexed | 2025-02-19T03:32:03Z |
| format | Journal Article |
| id | ntu-10356/106075 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:32:03Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-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 |
| 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 |
| title | 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_short | 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 |
| topic | W Doping BiVO4 DRNTU::Engineering::Materials |
| url | https://hdl.handle.net/10356/106075 http://hdl.handle.net/10220/48890 |
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