Figure 1

Schematic illustration of a standard (a) and the new (b) AFM electrochemical cells. In the standard cell the flat sample (a-1) is fixed and sealed at the bottom of the cell (a-2). The cell body is filled with the electrolyte and the cantilever is immersed in the electrolyte bath (a-3) for scanning. In the new cell the sample (b-1) is embedded into epoxy resin (b-2), polished/cross-sectioned (b-3), connected to the substrate by a conductive silver or carbon paint (b-4), and installed into an AFM. The cantilever is positioned above the sample (b-5), and the electrolyte is injected through the tubing to form the meniscus between the sample and the cantilever holder (b-6). The images were created in Blender 2.8 software (https://www.blender.org/).