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Steering Electron–Hole Migration Pathways Using Oxygen Vacancies in Tungsten Oxides to Enhance Their Photocatalytic Oxygen Evolution Performance
Author(s) -
Wei Zhen,
Wang Wenchao,
Li Wenlu,
Bai Xueqin,
Zhao Jianfeng,
Tse Edmund C. M.,
Phillips David Lee,
Zhu Yongfa
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202016170
Subject(s) - oxygen evolution , photocatalysis , oxygen , catalysis , photochemistry , water splitting , ultrafast laser spectroscopy , tungsten , materials science , oxide , absorption spectroscopy , chemistry , spectroscopy , optics , electrochemistry , physics , biochemistry , organic chemistry , electrode , quantum mechanics , metallurgy
The overall water splitting efficiency is mainly restricted by the slow kinetics of oxygen evolution. Therefore, it is essential to develop active oxygen evolution catalysts. In this context, we designed and synthesized a tungsten oxide catalyst with oxygen vacancies for photocatalytic oxygen evolution, which exhibited a higher oxygen evolution rate of 683 μmol h −1 g −1 than that of pure WO 3 (159 μmol h −1 g −1 ). Subsequent studies through transient absorption spectroscopy found that the oxygen vacancies can produce electron trapping states to inhibit the direct recombination of photogenerated carriers. Additionally, a Pt cocatalyst can promote electron trap states to participate in the reaction to improve the photocatalytic performance further. This work uses femtosecond transient absorption spectroscopy to explain the photocatalytic oxygen evolution mechanism of inorganic materials and provides new insights into the design of high‐efficiency water‐splitting catalysts.