Oxygen reduction reaction (ORR) kinetics were investigated on different copper surface conditions in 10-2 M Na 2 SO 4 solution. On pre-reduced and passivated copper surfaces, the ORR is suggested to occur by a parallel pathway involving HO 2 − formation followed by its diffusion to the solution or rapid reduction to OH −. A significant difference in ORR activity is observed in the kinetic and mixed control regions as copper surface becomes more oxidized. On a surface covered by ammonium pyrrolidine dithiocarbamate (PDTC), ORR rate is inhibited due to the adsorption of PDTC and formation of a protective film, which limits O 2 deposition on copper surface regardless of pH values and oxygen concentration in the solution.

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