Thermal Modulation of Rotating Disk Electrodes: Frequency and Transient Response

Publisher Website
Google Scholar
Abstract
A theoretical analysis is presented for the periodic thermal modulation of a rotating disk electrode heated from the back (nonelectrolyte) side with a chopped laser beam. Experimental measurements of the corresponding modulation in open‐circuit potentials and mass‐transfer limited currents were made as a function of both modulation and disk rotation frequencies and compared with theoretical predictions. The peak‐to‐peak amplitude of these electrochemical perturbations depends primarily on the temperature at the electrode surface and decreases markedly for increasing values of the ratio of modulation to rotation frequencies. Experimental deviations from a theory based on ideal thermal conduction and convection processes are related to electrode structure and the influence of energy transport to regions other than the electrode/electrolyte interface. Temperature relaxation experiments confirm the occurrence of thermal losses. An improved thermal design has been implemented to ameliorate this condition.

This publication has 0 references indexed in Scilit: