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In this paper,we synthesized cathode catalysts(PANI-PPYR,Fe/PANI-PPYR,Co/PANI-PPYR and Fe-Co/PANI-PPYR)with high performance oxygen reduction by using a simple heat treatment process.These catalysts were fabricated by directly calcining the Fe and/or Co doped polyaniline(PANI)-polypyrrole(PPYR)composites.Their electrocatalytic activity for ORR both in acidic and in alkaline media was investigated by voltammetric techniques.Among the prepared catalysts,Co/PANI-PPYR presents the most positive ORR onset potential of 0.62 V(vs.SCE)in 0.5 mol/L H2SO4 solution or?0.09 V(vs.SCE)in 1 mol/L NaOH solution.In addition,the Co/PANI-PPYR catalyst shows the largest limiting-diffusion current density for ORR,which is 4.3 mA/cm2@0.2 V(vs.SCE)in acidic and 2.3 mA/cm2@?0.3 V(vs.SCE)in alkaline media.In acidic media,a four-electron reaction of ORR on the Co/PANI-PPYR and Fe/PANI-PPYR catalysts is more dominant than a two-electron reaction.In alkaline media,however,a four-electron and a two-electron mechanisms are co-present for the ORR on all the prepared catalysts.Co/PANI-PPYR catalyst also presents good electrocatalytic activity stability for ORR both in acidic and in alkaline media.
In this paper, we synthesized cathode catalysts (PANI-PPYR, Fe / PANI-PPYR, Co / PANI-PPYR and Fe-Co / PANI-PPYR) with high performance oxygen reduction by using a simple heat treatment process. by directly calcining the Fe and / or Co-doped polyaniline (PANI) -polypyrrole (PPYR) composites. Their electrocatalytic activity for ORR both in acidic and in alkaline media was investigated by voltammetric techniques. Among the prepared catalysts, Co / PANI- PPYR presents the most positive ORR onset potential of 0.62 V (vs.SCE) in 0.5 mol / L H2SO4 solution or 0.09 V (vs.SCE) in 1 mol / L NaOH solution.In addition, the Co / PANI-PPYR catalyst shows the maximum limiting-diffusion current density for ORR, which is 4.3 mA / cm 2 @ 0.2 V (vs.SCE) in acidic and 2.3 mA / cm 2 @@ 0.3 V (vs.SCE) in alkaline media. electron reaction of ORR on the Co / PANI-PPYR and Fe / PANI-PPYR catalysts is more dominant than a two-electron reaction. In alkaline media, however, a four-electron and two- isms are co-present for the ORR on all the prepared catalysts. Co / PANI-PPYR catalyst also presents good electrocatalytic activity stability for ORR both in acidic and in alkaline media.