电沉积制备PMo12/rGO/PPy阳极及其在微生物燃料电池中的应用

微生物燃料电池(MFC)阳极材料的电化学特性影响其产电性能和污染物还原能力。采用电化学沉积法得到了磷钼酸/还原氧化石墨烯/聚吡咯(PMo₁₂/rGO/PPy)阳极,并对PMo₁₂/rGO/PPy阳极进行形貌表征和电化学特性分析,最后考察了PMo₁₂/rGO/PPy阳极MFC在不同浓度高氯酸盐(ClO₄-)下的产电和还原性能。结果表明:PMo₁₂/rGO/PPy阳极较对照阳极为微生物的附着提供了更大的比表面积,为电子传递提供更多的活性位点;使得MFC阳极表面的电荷转移量增加493%,电荷转移阻抗降低83.3%,交换电流密度提高53.4%。同时,当ClO₄-浓度为420 mg/L时,PMo₁₂/rGO/PPy阳极MFC产电性能最好,最大输出电压可达到148.47 mV。

PREPARATION OF PMo12/rGO/PPy ANODE BY ELECTRODEPOSITION FOR MICROBIAL FUEL CELLS

The electrochemical characteristics of anode materials for microbial fuel cells (MFC) affect their electrical performance and pollutant reduction capacity. In this experiment, the phosphomolybdic acid/reduced graphene oxide/polypyrrole (PMo₁₂/rGO/PPy) anode was obtained by electrochemical deposition method. Then the morphology and electrochemical characteristics of PMo₁₂/rGO/PPy anode were analyzed. Finally, the electricity generation and reduction performance of PMo₁₂/rGO/PPy anode MFC at different concentrations of perchlorate (ClO₄-) were investigated. The results showed that the PMo₁₂/rGO/PPy anode provided a larger specific surface area than the control for the attachment of microorganisms, thus providing more active sites for electron transport. The use of PMo₁₂/rGO/PPy anode resulted in an increase of charge transfer amount by 493%, a decrease of charge transfer impedance by 83.3%, and an increase of exchange current density by 53.4%. At the same time, when the concentration of ClO₄- was 420 mg/L, PMo₁₂/rGO/PPy anode MFC had the best power generation performance, and the maximum output voltage reached 148.47 mV.