Quantification of Surface Reactive Oxygen Species at Co-Modified BiVO4 with Surface Interrogation Mode of Scanning Electrochemical Microscopy

Abstract

Ultrasensitive electrochemical and optical imaging approaches are critical for realizing local chemical information particularly for systems such as sustainable energy harvesting and conversion. Scanning electrochemical microscopy (SECM)-based electrochemical and spectroelectrochemical techniques will be described in this presentation to illustrate ultrasensitive quantitative analysis of catalytic surfaces and localized redox activities with improved spatial and spectral and temporal resolutions. Examples of SECM based on ultramicroelectrodes, nanoelectrodes, and optical fiber electrodes and optical imaging techniques will be discussed. These techniques help understanding fundamental aspects of an electrochemical process, such as local heterogeneities in catalytic reaction and stability issues of functional low-dimension metallic and semiconductor electrode materials with synergistic functions for sunlight harvesting, conversion, and storage into chemical fuels. These studies will provide insights into developing unique catalytic and photonic properties of nanostructured electrode materials for the efficient and selectivity of the solar-to-fuel conversion.