Advances in measurement of interfacial chemical activity
National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, United Kingdom
The latest developments in interfacial mapping at NPL using scanning electrochemical microscopy (SECM) are reviewed. A suite of electrochemical imaging techniques has been developed that enable the multiscale mapping of electroactivity at solid-liquid interfaces, as demonstrated by a number of applications. Micron- scale imaging reveals non-uniform activity distribution across model catalyst films and microarray screening provides a convenient approach to compare the performance of electrocatalyst and photoactive materials for emerging energy conversion technologies. Imaging at the nanoscale is achieved using hybrid techniques that combine SECM with atomic force microscopy (AFM) and scanning ion conductance microscopy (SICM). Advances are demonstrated by topographical-electrochemical mapping of graphene flakes and imaging oxygen reduction electroactivity at the single nanoparticle level.
© Owned by the authors, published by EDP Sciences, 2015
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