阳极修饰对微生物燃料电池性能的影响

Effect of Anode Modification on the Performance of Microbial Fuel Cell

利用PW_(12)/rGO复合材料负载于碳布表面制得PW_(12)/rGO修饰阳极并构建单室空气阴极微生物燃料电池(microbial fuel cells,MFC),考察了PW_(12)/rGO修饰阳极对MFC产电和高氯酸盐(ClO-4)还原性能的影响,并通过对阳极表面形态及其电化学特性的分析,探讨了PW_(12)/rGO修饰阳极改善MFC产电性能的机理。结果表明,当ClO-4浓度为700 mg/L时,PW_(12)/rGO修饰阳极MFC的最大输出电压和ClO-4平均去除速率分别为200.18 mV和1.15 kg/(m^(3)·d),分别是空白阳极MFC的4.4倍和1.06倍;扫描电镜(SEM)表征显示,PW_(12)/rGO修饰阳极表面附着的微生物量远高于空白阳极;Tafel曲线、循环伏安曲线(CV)和交流阻抗谱(EIS)测试表明,PW_(12)/rGO修饰阳极较空白阳极具有更高的交换电流密度、CV电活性面积以及更低的电荷转移电阻。PW_(12)/rGO修饰阳极提高了阳极电子产量和电子传递速率,进而改善了MFC的产电性能。

The PW_(12)/rGO composite material were deposited on the surface of carbon cloth to obtain PW_(12)/rGO modified anode,which was used to construct a single-chamber air microbial fuel cell(MFC).The effect of PW_(12)/rGO modified anode on electricity generation and perchlorate reduction performance in MFC was investigated.Based on the analysis of anode surface morphology and its electrochemical characteristics,the mechanism of PW_(12)/rGO modified anode to improve the electricity generation performance of MFC was discussed.The results show that,by feeding a medium of ClO-4(700 mg/L),the maximum output voltage and the average removal rate of ClO-4 of PW_(12)/rGO modified anode MFC are 200.18 mV and 1.15(kg/m^(3)·d),which are 4.4 and 1.06 times compared to blank anode MFC,respectively.Scanning electron microscopy(SEM)show that microorganisms attached to the surface of PW_(12)/rGO modified anode is more than that of blank anode;tafel curve,cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS)reveal that PW_(12)/rGO modified anode enhances the exchange current density,CV electroactive area,and decreases charge transfer resistance.The anode electron yield and electron transfer rate are increased by PW_(12)/rGO modified anode,thereby the electricity generation performance of MFC is improved.