阳极修饰对微生物燃料电池性能的影响

利用PW12/rGO复合材料负载于碳布表面制得PW12/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PW12/rGO修饰阳极对MFC产电和高氯酸盐(ClO4-)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PW12/rGO修饰阳极改善MFC产电性能的机理.结果 表明,当ClO4-浓度为700 mg/L时,PW12/rGO修饰阳极MFC的最大输出电压和ClO4-平均去除速率分别为200.18 mV和1.15 kg/(m3·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,PW12/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,PW12/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.PW12/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.

Effect of PW12/rGO modified anode on electricity generation and perchlorate reduction performance of microbial fuel cell

In this study, the PW₁₂/rGO composite material were deposited on the surface of carbon cloth to obtain PW₁₂/rGO modified anode, which was used to construct a single-chamber air microbial fuel cell (MFC). The Effect of PW₁₂/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 PW₁₂/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^_-1), the maximum output voltage and the average removal rate of ClO_4^- of PW₁₂/rGO modified anode MFC are 200.18 mV and 1.15 kg.m^_-3.d^_-1, 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 PW₁₂/rGO modified anode is more than that of blank anode; tafel curve, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) reveal that PW₁₂/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 PW₁₂/rGO modified anode, thereby the electricity generation performance of MFC is improved.