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An investigation on the role of W doping in BiVO 4 photoanodes used for solar water splitting
Zhao X.1; Hu J.1; Chen S.1; Chen Z.1
2018
Source PublicationPhysical Chemistry Chemical Physics
ISSN14639076
Volume20Issue:19Pages:13637-13645
Abstractn-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 BiVO 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 BiVO 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 (OH , O , and OOH ) 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 BiVO , especially during surface catalysis.
DOI10.1039/c8cp01316k
URLView the original
Language英語
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被引频次[WOS]:9   [WOS记录]     [WOS相关记录]
Document TypeJournal article
专题University of Macau
Affiliation1.Nanyang Technological University
2.Northwest University China
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Zhao X.,Hu J.,Chen S.,et al. An investigation on the role of W doping in BiVO 4 photoanodes used for solar water splitting[J]. Physical Chemistry Chemical Physics,2018,20(19):13637-13645.
APA Zhao X.,Hu J.,Chen S.,&Chen Z..(2018).An investigation on the role of W doping in BiVO 4 photoanodes used for solar water splitting.Physical Chemistry Chemical Physics,20(19),13637-13645.
MLA Zhao X.,et al."An investigation on the role of W doping in BiVO 4 photoanodes used for solar water splitting".Physical Chemistry Chemical Physics 20.19(2018):13637-13645.
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