Roles of oxygen vacancies in surface plasmon resonance photoelectrocatalytic water oxidation
Roles of oxygen vacancies in surface plasmon resonance photoelectrocatalytic water oxidation
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DOI：
10.1016/j.xcrp.2023.101386
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发表时间：
2023-04
影响因子：
8.9
通讯作者：
Hao Li;Shengyang Wang;Jianbo Tang;Huichen Xie;Jiangping Ma;H. Chi;Canbing Li
中科院分区：
文献类型：
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作者：
Hao Li;Shengyang Wang;Jianbo Tang;Huichen Xie;Jiangping Ma;H. Chi;Canbing Li
等离激元诱导电荷的极短寿命是表面等离激元共振光催化水氧化的巨大挑战。在这里，我们报告说，增加 Au/TiO2-x 中的氧空位 (VO) 可以大大提高等离激元诱导的水氧化的外量子效率，在 520 nm 处从 0.03% 提高到 1.52%。增加的VO可以在TiO2-x的导带中实现等离子体电子的有效传输，并增强电导率，并可以提高Au/TiO2-x的析氧动力学。带间跃迁衍生的等离子体电子动力学表明，Au纳米粒子（NPs）d带中的空穴可以转移到TiO2-x价带附近的缺陷态，这些缺陷态源自Au/TiO2-x界面处的VO。这个过程可以丰富界面处的空穴，从而可以收集多个空穴进行水氧化。空穴捕获和水分子吸附的同步功能使VO成为等离子体诱导水氧化的有效催化位点。
The extremely short lifetime of plasmon-induced charges is a huge challenge to surface plasmon resonance photocatalytic water oxidation. Here, we report that increasing oxygen vacancies (VO) in Au/TiO2-xcan greatly enhance the external quantum efficiency of plasmon-induced water oxidation from 0.03% to 1.52% at 520 nm. The increasedVOcan achieve efficient transportation of plasmonic electrons in the conduction band of TiO2-xwith enhanced conductivity and can boost the oxygen evolution kinetics of Au/TiO2-x. The dynamics of plasmonic electrons derived from interband transition reveal that holes in the d-band of Au nanoparticles (NPs) can transfer to the defect states near the valence band of TiO2-x, which originate fromVOat the interface of Au/TiO2-x. This process could enrich holes at the interface, making it possible to collect multiple holes for water oxidation. The synchronous functions in hole capture and water molecule adsorption enableVOto be efficient catalytic sites for plasmon-induced water oxidation.