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Enhanced Photocatalytic Water Splitting on Very Thin WO3 Films Activated by High-Temperature Annealing

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dc.abstract.enFurther advancement in sunlight-driven splitting of water as a means of producing hydrogen and oxygen is mainly hampered by the availability of easy-to-prepare, inexpensive n-type semiconductor materials able to operate as stable and efficient photoanodes in a water photoelectrolysis cell. Here, we demonstrate that photocatalytic water oxidation currents on thin-layer semitransparent WO3 electrodes, deposited by using a one-step sol–gel method on conductive oxide F-SnO2 substrates, are dramatically improved following additional higher-temperature (ca. 700 °C) annealing. Largely reduced recombination of charge carriers photogenerated in activated WO3 associated with enhanced light absorption yields at 1.23 V vs RHE, under simulated solar AM 1.5G irradiation (100 mW cm–2), water photo-oxidation currents close to 4.2 mA cm–2 on a 1.2-μm-thick photoanode—approximately 2 times larger than on the electrodes of the same thickness only annealed at 550 °C. The relative enhancement of the photocurrent induced by the further annealing at 700 °C scaled up with decreasing the film thickness with a 3-fold increase observed for the thinnest tested, 0.25-μm-thick WO3 electrode that reaches 2.75 mA cm–2. We obtained such high photocatalytic water splitting performance without depositing any additional water oxidation catalyst.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorStrawski, Marcin
dc.contributor.authorKurzydłowski, Dominik
dc.contributor.authorBieńkowski, Krzysztof
dc.contributor.authorJadwiszczak, Michał
dc.contributor.authorJelińska, Aldona
dc.contributor.authorSolarska, Renata
dc.contributor.authorPisarek, Marcin
dc.contributor.authorAugustyński, Jan
dc.date.accessioned2024-01-24T22:48:22Z
dc.date.available2024-01-24T22:48:22Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.description.number11
dc.description.volume8
dc.identifier.doi10.1021/ACSCATAL.8B03497
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/106221
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofACS Catalysis
dc.relation.pages10573–10580
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.entungsten trioxide
dc.subject.entin oxide
dc.subject.enwater photo-oxidation
dc.subject.enphotoanode
dc.subject.enphotoelectrochemistry
dc.subject.enphotocatalysis
dc.titleEnhanced Photocatalytic Water Splitting on Very Thin WO3 Films Activated by High-Temperature Annealing
dc.typeJournalArticle
dspace.entity.typePublication