Glass-insulated platinum-iridium microelectrodes were used to measure the surface concentration of chemical specles generated by a spechen electrode as a functton of specimen electrode potentlai. The resultant surface concentration-potential curves contain information about the microscopically local electron-transfer kinetics of a reaction occurring at a klnetkaily heterogeneous electrode. The quaitty of the curves and the spatial resolution were measured as a function of spechen electrode scan rate using ferrocyanide as the electroactive species. Spatial resolution was on the order of tens of micrometers. However, when a chemlcaiiy unstable species was generated at the specimen electrode, resolution improved significantly due to the limited diffusional lifetime of the unstable species.

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