Wang Ying, Zhao Cui-E, Sun Dong, Zhang Jian-Rong, Zhu Jun-Jie
State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093 (P. R. China), Fax: (+86) 25-83594976.
Chempluschem. 2013 Aug;78(8):823-829. doi: 10.1002/cplu.201300102. Epub 2013 Jun 21.
A microbial fuel cell (MFC) is an innovative power-output device, which utilizes microorganisms to metabolize fuel and transfers electrons to the electrode surface. In this study, we decorated the surface of graphene (G) with a conducting polymer, poly(3,4-ethylenedioxythiophene) (PEDOT), through galvanostatic electropolymerization to fabricate a G/PEDOT hybrid anode for an Escherichia coli MFC. Cyclic voltammetry and electrochemical impedance spectroscopy analyses illustrated that the G/PEDOT hybrid anode possesses a larger active surface area and lower charge-transfer resistance than three other kinds of anodes, namely, carbon paper (CP), graphene-modified carbon paper (CP/G), and PEDOT-modified carbon paper (CP/PEDOT). Scanning electron microscopy was used to investigate the bacteria growth on the four anodes. A compact biofilm was formed on the hybrid anode owing to the electrostatic interaction between the negatively charged bacteria and positively charged PEDOT backbone. The constant-load (1 KΩ) discharge curves of MFCs with CP, CP/G, CP/PEDOT, and G/PEDOT anodes revealed that the G/PEDOT electrode had good stability and high voltage output. The G/PEDOT anode generated a maximum power density of 873 mW m , which is about 15 times higher than that of CP (55 mW m ) in an H-shaped dual-chamber MFC. All the experimental results suggest that the performance of the G/PEDOT hybrid anode is superior to the CP, CP/G, or CP/PEDOT anode.
微生物燃料电池（MFC）是一种创新的功率输出装置，它利用微生物代谢燃料并将电子转移到电极表面。在本研究中，我们通过恒电流电聚合用导电聚合物聚（3,4-乙撑二氧噻吩）（PEDOT）修饰石墨烯（G）表面，以制备用于大肠杆菌MFC的G/PEDOT复合阳极。循环伏安法和电化学阻抗谱分析表明，G/PEDOT复合阳极比其他三种阳极，即碳纸（CP）、石墨烯修饰碳纸（CP/G）和PEDOT修饰碳纸（CP/PEDOT），具有更大的活性表面积和更低的电荷转移电阻。利用扫描电子显微镜研究了四种阳极上细菌的生长情况。由于带负电荷的细菌与带正电荷的PEDOT主链之间的静电相互作用，在复合阳极上形成了致密的生物膜。采用CP、CP/G、CP/PEDOT和G/PEDOT阳极的MFC的恒负载（1 KΩ）放电曲线表明，G/PEDOT电极具有良好的稳定性和高电压输出。在H型双室MFC中，G/PEDOT阳极产生的最大功率密度为873 mW m ，约为CP（55 mW m ）的15倍。所有实验结果表明，G/PEDOT复合阳极的性能优于CP、CP/G或CP/PEDOT阳极。
