Abstract
The development of highly efficient electrocatalysts requires a deeper understanding of their structure–activity relationship. Scanning electrochemical microscope (SECM) and scanning electrochemical cell microscope (SECCM) are powerful techniques for mapping surface activity site and investigating heterogeneous electrocatalytic processes down to the nanoscale in situ and even operando, thus playing a pivotal role in studying electrocatalytic mechanism. In this review, we introduce the fundamentals of SECM and SECCM, and the principles of the most frequently used operational modes. This review describes work done in SECM and SECCM since 2021 with a particular emphasis on emerging electrocatalytic applications and noteworthy trends.
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