The influence of uncompensated solution resistance in large-amplitude potential step chronoamperometry involving reversible redox systems was investigated. By means of additional external resistors, the system-imminent resistance could be deliberately changed. The observed current-transients show significant deviations from the ideal "Cottrell" behaviour. It is shown by means of digital simulation experiments that already small uncompensated resistance values give rise to distorted current-transients particularly in systems with high charging or faradaic currents. This effect manifests itself in particular in electrochemical reactions on polymer-coated electrodes. © 1989.
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