光电流
光电化学
催化作用
化学物理
电解质
电荷(物理)
电荷密度
电流密度
电极
分解水
材料科学
氢
纳米技术
化学
电化学
物理化学
光电子学
物理
生物化学
有机化学
光催化
量子力学
作者
Wei Nie,Xun Wang,Ziyuan Wang,Yuying Gao,Ruotian Chen,Yong Liu,Can Li,Fengtao Fan
标识
DOI:10.1021/acs.jpclett.1c03127
摘要
Understanding the role of surface charges in the catalytic reaction is of great importance to fundamental science in photoelectrochemistry (PEC). However, spatial heterogeneities of charge transfer sites and catalytic sites at the electrode/electrolyte interface obscures the surface reaction process. Herein, we quantified the relationship between the local catalytic current of the hydrogen evolution reaction (HER) and the surface charge density using operando spatially resolved photovoltage microscopy on the Pt/Ti array on the p-Si photoelectrode. We found that the Pt/Ti islands on the p-Si surface worked as the main charge collect areas but as the sole catalytic sites to drive the PEC hydrogen evolution. Based on the achievements of identifying the local photocurrent and photovoltage on a single Pt/Ti island, we found that the local HER current can be linearly regulated by the charge density at reactive sites by concurrently adjusting the bias potential and the spacings of the Pt/Ti islands. These results emphasize the significant impact of the surface charge density on the catalytic activity in photoelectrochemistry.
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