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The electrochemical properties of the Co 3 C carbide have been studied. In contrast to metallic cobalt, its carbide is characterized by higher electrocatalytic activity in the hydrogen evolution reaction and low rate of anodic oxidation in acidic sulfate solutions. The oxidation in borate solutions (pH=6.3-9.0) results in the formation of oxide films different in phase composition. In the case of metallic cobalt, a passive film consisting of CoO and Co(OH) 2 forms, while the cobalt carbide oxidation results in the formation of the Co 3 O 4 film. The oxidation of cobalt carbide is an irreversible process accompanied by the accumulation of carbon on the surface.

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