When deposited on graphite, ferric phthalocyanine has been found to be a good catalyst for electrochemical oxygen reduction in near neutral isotonic saline electrolytes (pH 7.22). In this study, the electrochemical reduction of oxygen and hydrogen peroxide at the ferric phthalocyanine‐graphite electrode was investigated over a wide range of pH‐values by linear sweep voltammetry in order to characterize the catalyst system. The results are compared with those at platinized platinum and graphite electrodes. The activity of the ferric phthalocyanine‐graphite electrode is approximately equal to that of the platinized platinum electrode in . In acid solution, the ferric phthalocyanine‐graphite electrode has a fair activity but becomes inactive once a fairly negative potential is imposed.