Oxygen electrode kinetics in 85% orthophosphoric acid have been studied as a function of temperature and impurity level in the electrolyte. It is shown that the mechanism of reaction is the same as that in N perchloric acid, and that rate constants and Tafel slopes are dependent on impurity adsorption. Hydrogen peroxide is not a significant reaction product, at least at high temperatures. The activation energy of the reaction at the reversible potential was determined to be
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A.J. Appleby (1970) studied this question.