Quantitative framework for the definition of planar spatial resolution in scanning electrochemical microscopy

This study presents a set of quantitative criteria for the definition of planar spatial resolution in scanning electrochemical microscopy (SECM) imaging using an effective diffusion ellipsoid (EDE) model. Experiments and simulations confirm that smaller electrodes improve imaging resolution, and the resolution-step-size equivalence holds across both feedback and generation-collection modes. The finding reported here enables the establishment of standardized conditions for surface activity mapping by SECM.