Abstract
In the realm of single-channel scanning electrochemical cell microscopy (SECCM), two primary methods are utilized for approaching the micropipette onto the substrate surface, specifically the chronoamperometric and chronopotentiometric methods. The chronoamperometric method is typically employed in corrosion studies utilizing SECCM, although it has been observed that negative approach potentials can influence subsequent microscale electrochemical measurements as a result of cathodic degradation of the metal oxide film. In this study, we investigated the practicality and stability of utilizing the chronopotentiometric approach method in SECCM-based corrosion research, and we found that the metal surface change during the approach process can be reduced by applying a 0 A approach signal, allowing for the acquisition of primitive electrochemical information of the surface.
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