Abstract
The irreversibility of the oxygen electrode reaction is the main cause of efficiency losses in water electrolysis cells, fuel cells, and some battery systems. At conditions typical for water electrolysis, the effectiveness of various metal oxide electrodes toward oxygen evolution decreased in the order. Poor activities were observed on V, Cr, Mo, W, Mn, and Re oxide electrodes. When mixed with 70 mole percent (m/o) , all metal oxides tested except ruthenium oxide were ineffective in catalyzing the oxygen evolution reaction. A catalyst‐loading study showed that films on Ti require about to mask the effect of the titanium substrate. Either a chemical step or a second electron transfer step appears to be rate determining for the oxygen evolution reaction on oxide electrodes with good electrocatalytic properties. Studies of the oxygen reduction reaction indicate that the activity of oxide electrodes in the cathodic direction is considerably less than in the anodic direction.
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