Abstract
Electrocatalytic and photo(electro)catalytic activities of 2D materials are highly heterogeneous with different active sites, e.g., structural defects and facet edges, contributing to the overall current. Scanning electrochemical microscopy (SECM) and related techniques have been extensively used for localized measurements of electrocatalytic activity; however, the progress is hindered by the difficulty in pinpointing the active sites, particularly when their size is on the atomic scale. We have recently reported the use of SECM for nanoscale imaging of electrocatalytic reactions at 2D materials and photoelectrochemical processes at semiconductor surfaces. In this paper, we present new approaches to surface reactivity mapping, including electrochemical and photoelectrochemical tunneling experiments at monolayers and nm-thick exfoliated flakes of MoS2.
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