Elucidating the role of surface states of BiVO4 with Mo doping and a CoOOH co-catalyst for photoelectrochemical water splitting

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/61989592:15640/21:73607282

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Elucidating the role of surface states of BiVO4 with Mo doping and a CoOOH co-catalyst for photoelectrochemical water splitting

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Elucidating the role of surface states of BiVO4 with Mo doping and a CoOOH co-catalyst for photoelectrochemical water splitting

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10400 - Chemical sciences

Projekt

<a href="/cs/project/EF15_003%2F0000416" target="_blank" >EF15_003/0000416: Pokročilé hybridní nanostruktury pro aplikaci v obnovitelných zdrojích energie</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Power Sources

ISSN

0378-7753

e-ISSN

—

Svazek periodika

483

Číslo periodika v rámci svazku

31. 1. 2021

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

—

Kód UT WoS článku

000621294500001

EID výsledku v databázi Scopus

2-s2.0-85096224405