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The oxygen reduction reaction on platinum that has been anodized, followed by reduction at 500 mV, has been studied in 85% orthophosphoric acid over a wide temperature range. This anodized platinum surface is more active for oxygen reduction than annealed reduced platinum in the 850–950 mV potential range and has a higher Tafel slope (1.79 RT/F at 25°C, compared to 1.04 RT/F for the annealed surface). Activation energy at the reversible potential is . It is suggested that the rate‐determining step on this surface is
A.J. Appleby (Thu,) studied this question.