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Single Electron Trapped Oxygen Vacancy on Ultrathin WO3·0.33H2O {100} Facets Suppressing Backward Reaction for Promoted H2 Evolution in Pure Water Splitting.

08:00 EDT 16th May 2019 | BioPortfolio

Summary of "Single Electron Trapped Oxygen Vacancy on Ultrathin WO3·0.33H2O {100} Facets Suppressing Backward Reaction for Promoted H2 Evolution in Pure Water Splitting."

Solar water splitting to produce hydrogen is a promising solution for global energy issues. One of the main bottlenecks in this technology is the spontaneous fast backward reaction (2H2 + O2 → H2O, ΔG < 0), limiting the solar energy conversion efficiency. How to suppress backward reaction is vitally important but rarely reported. Here we found that single electron trapped oxygen vacancy (Vo•) can suppress spontaneous backward reaction in pure water splitting. Taking WO3·0.33H2O catalyst as an example, ultrathin WO3·0.33H2O {100} facets with large amount of surface Vo• realized a continuous H2 evolution from pure water splitting with a productivity of 9.9 μmol/g·h without the assistance of any sacrifice agent and noble metal co-catalyst. Quantum chemical calculations revealed that the backward reaction suppression ability of Vo• is attributed to the high concentration of localized electrons around Vo•, stimulating unidirectional simultaneous water dissociation into H and OH under light irradiation.

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Name: The journal of physical chemistry letters
ISSN: 1948-7185
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