Abstract
Scanning electrochemical cell microscopy (SECCM) is a unique tool for nanoscale electrochemical imaging for characterizing sample reactivity. It uses a mobile meniscus state electrochemical cell between the nanopipette and the sample.The chapter describes the method setup and principles as well as its reported applications in materials sciences. SECCM was successfully used to image various types of reactions such as hydrogen/oxygen evolution, oxygen/CO2 reduction, corrosion, photocatalysis, and charge/discharge processes in battery materials. The studied objects included carbon phases: diamond and graphite with their derivatives; polymers; transitional metal dichalcogenides; metals; Li complex oxides. SECCM demonstrated site-dependent electrochemical activity, particularly, the role of defects and grain boundaries. Combination of SECCM with EBSD provided the information about the correlation between electrochemical reactivity and terminating facet in multiple kinds of 3D materials.Moreover, SECCM can be used not only to image but also to build new patterned on-surface (sub)microstructures by loading the precursors into the pipette or by site-dependent electrooxidation/reduction of the surface. Thus, the advantages and goals of SECCM for various applications are described in the chapter.
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