A carbon material doped with both porous FeOx and N as an efficient catalyst for oxygen reduction reactions
To replace precious metal oxygen reduction reaction(ORR)electrocatalysts,many transition metals and N-doped car-bon composites have been proposed in the last decade resulting in their rapid development as promising non-precious metal catalysts.We used Ketjenblack carbon as the precursor and mixed it with a polymeric ionic liquid(PIL)of[Hvim]NO3 and Fe(NO3)3,which was thermally calcined at 900 ℃ to produce a porous FeOx,N co-doped carbon material denoted FeOx-N/C.Because the PIL of[Hvim]NO3 strongly combines with and disperses Fe3+ions,and NO3-is thermally pyrolyzed to form the porous structure,the FeOx-N/C catalyst has a high electrocatalytic activity for the ORR in both 0.1 mol L-1KOH and 0.5 mol L-1 H2SO4 electrolytes.It was used as the catalyst to assemble a zinc-air battery,which had a peak power density of 185 mW·cm 2.Its superior electrocatalytic activity,wide pH range,and easy preparation make FeOx-N/C a promising electrocatalyst for fuel cells and metal-air batteries.
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