Electricity Production and Anode Capacitive Characteristics of Microbial Fuel Cell with Mn₃O₄-Coated Anode

Mn₃O₄-coated electrodes were prepared.They were used as the anodes of the microbial fuel cells (MFC) to study the effect of Mn₃O₄ on electricity production and anode capacitive characteristics.The results showed that the maximum power density of the MFC with Mn₃O₄-coated anode was 255 mW/m²,25% higher than that of the bare anode.Cyclic voltammetry tests showed that the specific capacitance of Mn₃O₄-coated anode was 14.7 mF/cm²,88% larger than that of the bare anode.The R(Q(R(QR)))(QR) model was created to analysis the formation and figure of internal resistance and capacitive in EIS test.Tests showed that Mn₃O₄-coated electrodes reduced the internal resistance of charge transfer and increased the pseudo capacitance between biofilm and electrode interface,and thus improved the power production capacity of MFC and the energy efficiency of batch mode MFC.