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The effects of W/Mo-co-doped BiVO4 photoanodes for improving photoelectrochemical water splitting performance

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Abstract
The poor electrical conductivity of bismuth vanadate (BVO) can be improved by metal-doping at optimum
percentage. Previously, we improved the photoelectrochemical (PEC) properties of BVO photoanodes by optimizing the different atomic percentage of molybdenum (Mo). Here, we co-doped BVO simultaneously with
tungsten/molybdenum (W/Mo) to enhance the water splitting properties of BVO photoanodes. At optimum codoping percentages of 0.5 %W-2%Mo BiVO4 (0.5W-2Mo-BVO) the photocurrent density maximum was ∼ 0.97
mA cm?2 at 0.6 V vs. Ag/AgCl. The water splitting was performed under 100 mW. cm-2 irradiation and 0.6 V vs.
Ag/AgCl applied voltage for 0.5W-2Mo-BVO. The H2 production was 19.5 μmol.cm-2 after 2 h at optimized W/
Mo co-doping. W/Mo co-doping into BiVO4 greatly improved the electron mobility, as demonstrated by photocurrent, Mott-Schottky, electrochemical impedance, open circuit potential (ΔOCP) and incident photon conversion efficiencies (IPCE) measurements. As compared to pure BVO, 0.5W-2Mo-BVO showed ∼2700-fold increase in the donor concentration (ND) and greatly decreased (1/60) space charge layer thickness (WSCL), which
induced efficient charge carrier mobility and enhanced the PEC performance.
Author(s)
이병규M. Tayebi
Issued Date
2021
Type
Article
Keyword
Photoelectrochemical (PEC)0.5W-2Mo-BVOHydrogen productionDonor concentrationSpace charge layer
DOI
10.1016/j.cattod.2020.03.066
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9258
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_crossref_primary_10_1016_j_cattod_2020_03_066&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,The%20effects%20of%20W%2FMo-co-doped%20BiVO4%20photoanodes%20for%20improving%20photoelectrochemical%20water%20splitting%20performance&offset=0&pcAvailability=true
Publisher
CATALYSIS TODAY
Location
네덜란드
Language
영어
ISSN
0920-5861
Citation Volume
361
Citation Number
1
Citation Start Page
183
Citation End Page
190
Appears in Collections:
Engineering > Civil and Environmental Engineering
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