Data for Synchronous electrical conductance- and electron tunnelling-scanning electrochemical microscopy measurements

At slow tip approach rates, the current shows an exponential dependence on tip‐substrate distance, as expected for electron tunnelling. For measurements in electrochemical environments, in order to overcome well‐known problems with leakage currents at coated‐wire tips used for electrochemical STM, Pt‐sensitised carbon nanoelectrodes are used as tips. The hydrogen evolution reaction on 2D Au nanocrystals serves as an exemplar system for the successful simultaneous mapping of topography and electrochemical activity.<br><br>Additional information on data collection methods: Data consist of CSV tables of current values sampled at every 1 ms at different X, Y and Z coordinates.

That processing by “in-painting” method was used in some figures and information regarding the method and where it was used can be found in the main manuscript and supporting information. Instrument information is detailed in the main manuscript.