Elucidating the role of surface states of BiVO4 with Mo doping and a CoOOH co-catalyst for photoelectrochemical water splitting
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27640%2F21%3A10247713" target="_blank" >RIV/61989100:27640/21:10247713 - isvavai.cz</a>
Alternative codes found
RIV/61989592:15640/21:73607282
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0378775320313756?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0378775320313756?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jpowsour.2020.229080" target="_blank" >10.1016/j.jpowsour.2020.229080</a>
Alternative languages
Result language
angličtina
Original language name
Elucidating the role of surface states of BiVO4 with Mo doping and a CoOOH co-catalyst for photoelectrochemical water splitting
Original language description
Bismuth vanadate (BiVO4) is a promising material for photoelectrochemical (PEC) water splitting, however, its PEC performance is limited by the high surface and bulk charge recombination rates. Here we present a comprehensive study to elucidate a recombination phenomenon of BiVO4 that arises with Mo doping. The Mo doping produces multiple effects including the formation of MoOx (reduced form of Mo6+) species and oxygen vacancies (V(O)s) on the surface of the BiVO4 that work in tandem with V4+ species (and MoOx) acting as surfaceactive intermediates (i-SS) providing improved hole transfer to the electrolyte. In contrast, in the absence of V4+ species, the V(O)s can act as recombination centers (r-SS). Further, CoOOH co-catalyst coating is used to minimize such recombination centers. Eventually, a photocurrent enhancement of similar to 37 times (1.1 mA/cm(2) at 1.23 V vs. RHE) and a cathodic shift in onset potential of similar to 500 mV compared to that of pristine BiVO4 (0.03 mA/cm(2) at 1.23 V vs. RHE) is obtained. We carried out in-depth PEC analysis using hole scavenger measurements, PEC impedance spectroscopy, and intensity-modulated photocurrent spectroscopy to elucidate the effect of the surface reduction process upon doping, the impact of Vos, MoOx species and CoOOH layer on the enhanced PEC performance.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10400 - Chemical sciences
Result continuities
Project
<a href="/en/project/EF15_003%2F0000416" target="_blank" >EF15_003/0000416: Advanced Hybrid Nanostructures for Renewable Energy Applications</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Power Sources
ISSN
0378-7753
e-ISSN
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Volume of the periodical
483
Issue of the periodical within the volume
31. 1. 2021
Country of publishing house
US - UNITED STATES
Number of pages
13
Pages from-to
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UT code for WoS article
000621294500001
EID of the result in the Scopus database
2-s2.0-85096224405