扫描电化学显微镜在光电化学研究中的应用

Applications of scanning electrochemical microscopy in photoelectrochemistry

深入研究各种光电化学反应过程的机理和反应动力学性质等对提升光电转换效率、发展绿色高效光伏能源器件具有重要意义.扫描电化学显微镜(SECM)是一种具有高时空分辨率的电化学扫描探针显微镜技术,不仅可以研究光电催化反应的机理和动力学性质,还可以通过光电流反馈模式进行组合成像,实现光电催化剂的性能评估和优选,近年来逐渐成为光电化学研究领域微区观测和反应动力学研究的重要技术手段.本综述系统介绍了SECM在光电化学研究中的应用,首先介绍用于光电化学研究的SECM的实验装置、工作原理和工作模式,然后对SECM在光合作用、光诱导电荷转移、电致化学发光、光解水、太阳能电池等光电化学研究领域的应用进行了详细介绍,最后展望了SECM在光电化学研究领域中的应用发展方向.

Investigation of the mechanism and reaction kinetics of photoelectrochemical reaction processes is significantly important for accelerating the conversion efficiency of light to electric and the developments of new high efficient green photovoltaic devices. Scanning electrochemical microscopy （SECM）, a kind of electrochemical scanning probe microscopy with high spatio-temporal resolution, can provide photoelectrochemical current of samples, study the reaction mechanism and kinetics of photoelectrochemical reactions, and evaluate and optimize the activities of photoelectrochemical catalysts. It has become an important characterization technique in studies of various interfacial photoelectrochemical processes in recent years. This review introduces the applications of SECM in the photoelectrochemistry field. First, the experimental system, working principle and working modes of SECM in the photoelectrochemical studies are introduced. Then the applications of SECM in investigations of photosynthesis, photoinduced electron transfer, electrogenerated chemiluminescence, water splitting and solar cells are summarized in detail. Final, the outlook of the future applications and developments of SECM in the photoelectrochemical field are discussed.