Yang Minji, He Huichao, Du Jinyan, Peng Huarong, Ke Gaili, Zhou Yong
State Key Laboratory of Environmental-Friendly Energy Materials, School of Materials Science and Engineering , Southwest University of Science and Technology , Mianyang 621010 , China.
College of Chemistry and Chemical Engineering , Chongqing University , Chongqing 400030 , China.
J Phys Chem Lett. 2019 Oct 17;10(20):6159-6165. doi: 10.1021/acs.jpclett.9b02365. Epub 2019 Oct 1.
Improvements to solar water oxidation performance for WO photoanodes due to oxygen vacancies have in general been ascribed to thermodynamic effects. Detailed insights into the water oxidation kinetics for WO photoanodes with oxygen vacancies are still lacking. Here, our experimental and computational investigations revealed that the water oxidation pathway on WO photoanodes with oxygen vacancies is more inclined to follow the four-hole pathway. This finding reasonably explained the common observations of higher faradaic efficiency for oxygen evolution, better stability, and faster kinetics for water oxidation usually achieved on the WO photoanodes with oxygen vacancies.
由于氧空位导致的WO光阳极太阳能水氧化性能的改善通常归因于热力学效应。目前仍缺乏对具有氧空位的WO光阳极水氧化动力学的详细见解。在这里，我们的实验和计算研究表明，具有氧空位的WO光阳极上的水氧化途径更倾向于遵循四孔途径。这一发现合理地解释了通常在具有氧空位的WO光阳极上实现的析氧法拉第效率更高、稳定性更好以及水氧化动力学更快的常见现象。
