Topography Mapping with Scanning Electrochemical CellMicroscopy br

High-resolution scanning electrochemical cell mi-croscopy (SECCM), synchronously visualizing the topography andelectrochemical activity, could be used to directly correlate thestructure and activity of materials nanoscopically. However, itstopographical measurement is largely restricted by the size andstability of the meniscus droplet formed at the end of thenanopipette. In this paper, we report a scheme that could reliablygain several tens nanometer resolution (>= 65 nm) of SECCM usinghomemade similar to 50 nm inner diameter probes. Furthermore, thetopography and hydrogen evolution reaction (HER) activity of similar to 45 nm self-assembled Au nanoparticles monolayer weresimultaneously recorded successfully. This scheme could makemapping of both topologic and chemical properties of samples in the nanometer regime with SECCM routinely, which potentiallycan largely expand thefield of SECCM applications.