Huang Li-Hua, Li Xiu-Fen, Ren Yue-Ping, Wang Xin-Hua
Laboratory of Environmental Biotechnology, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China.
School of Life Science, Linyi University, Linyi 276005, China.
Huan Jing Ke Xue. 2017 Apr 8;38(4):1717-1725. doi: 10.13227/j.hjkx.201609062.
Microbial fuel cell (MFC) technology has potential in recovering bioelectricity from different types of waste, which attracts more and more attention in the field of environment and energy. However, low power density, high cost and low substrate degradation rate, closely associated with anode performance, limit its practical application. In this study, proportional polyaniline (PANI) together with graphene was chosen to obtain the PANI dopped graphene composite. The as-received composite was modified onto the surface of glassy carbon electrode. The results of electrochemical analysis showed that the optimal mass ratio of graphene was 20% for cyclic voltammetry (CV) and linear sweep voltammetry (LSV) analysis. The anodes with 5% graphene produced a peak power density of (831±45) mW·m, which was 1.2, 1.3, 1.3, 1.5, 1.8 times of those with 20% graphene, 1% graphene, graphene, PANI and carbon cloth, respectively. Moreover, 5% graphene reactors showed the maximum values in output voltage, open-circuit voltage (OCV), chemical oxygen demand (COD) removal rate, coulombic efficiency (CE), and biomass density. The polarization resistance was only (24±2)Ω in 5% graphene reactors,which was 19.8% of that of carbon cloth. The results of electrochemical analysis were not consistent with those of bioelectrochemical analysis, demonstrating that the biocompatibility of electrode was one of the important factors affecting MFC performance. 5% graphene anode showed full advantages of graphene and PANI, which improved the performance of MFC.
微生物燃料电池（MFC）技术在从不同类型的废物中回收生物电方面具有潜力，这在环境和能源领域引起了越来越多的关注。然而，与阳极性能密切相关的低功率密度、高成本和低底物降解率限制了其实际应用。在本研究中，选择比例聚苯胺（PANI）与石墨烯一起制备聚苯胺掺杂石墨烯复合材料。将所制备的复合材料修饰在玻碳电极表面。电化学分析结果表明，对于循环伏安法（CV）和线性扫描伏安法（LSV）分析，石墨烯的最佳质量比为20%。含5%石墨烯的阳极产生的峰值功率密度为(831±45) mW·m，分别是含20%石墨烯、1%石墨烯、石墨烯、聚苯胺和碳布的阳极的1.2、1.3、1.3、1.5、1.8倍。此外，5%石墨烯反应器在输出电压、开路电压（OCV）、化学需氧量（COD）去除率、库仑效率（CE）和生物量密度方面显示出最大值。5%石墨烯反应器中的极化电阻仅为(24±2)Ω，是碳布极化电阻的19.8%。电化学分析结果与生物电化学分析结果不一致，表明电极的生物相容性是影响MFC性能的重要因素之一。5%石墨烯阳极展现出石墨烯和聚苯胺的全部优势，提高了MFC的性能。
