Preparation and characterization of Fe and Zn co-doped polyaniline microbial fuel cell cathode catalysts
In order to address the issues of low durability,slow kinetics of the oxygen reduction reaction(ORR),and high cost of cathode catalysts for microbial fuel cells(MFC),a porous carbon co-doped with Fe,Zn,and N as an air cathode catalyst was prepared.The electrochemical studies demonstrated that the synthesised catalyst Fe/Zn-NC-0.9 exhibited excellent electrocatalytic activity for the oxygen reduction reaction.The charge transfer resistance and the exchange current density were measured at 5.6 Ω and 53.3 mV/dec,respectively,while the maximum power density was at(1 253±20)mW/m2.Additionally,the impact of the Fe doping level on the ORR reaction and maximum power density was assessed.It was found that a moderate Fe doping level is essential for enhancing catalytic activity.Furthermore,the cathode performance is improved through the synergistic effect of Fe and N co-doping.
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