Abstract
Kinetic heterogeneity on highly ordered pyrolytic graphite (HOPG) electrodes was characterized by using electrogenerated chemiluminescence imaging. The reaction of luminol in alkaline peroxide was used with a sensitive microscope-based imaging system to monitor the course of electron transfer at various regions on the HOPG surface. The ability to image with temporal resolution provided for the construction of local voltammograms, so that estimates of kinetic differences between plane and defect-rich HOPG could be obtained. Electrochemical pretreatment of basal plane HOPG produced a surface electrochemically similar to a defect-rich surface
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