Abstract
Oxygen reduction in alkaline solution on a wide range of carbon blacks, active carbons, and graphites has been studied using the ultra thin electrode technique. Results were obtained as a function of pH and KOH concentration, oxygen partial pressure, and temperature. Under all conditions, the pH dependence of the reaction ( vs nhe) at constant cd is zero, as pH (or KOH concentration) increases. In concentrated alkali, a change in mechanism is noted. The pH region for this change increases as BET area of the carbon increases. A mechanism is suggested to account for these observations, which do not involve a reversible O 2/O 2H − couple. For carbons exhibiting the second (∼2 RT/3 F Tafel slope) mechanism in 6 N KOH, activity is proportional to available surface area.
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