石墨烯/聚苯胺复合阳极的制备及在MFC中的应用

采用化学氧化还原法制备高纯度石墨烯（GR），利用电化学修饰法得到石墨烯/聚苯胺（GR/PANI）膜阳极，采用红外光谱（FI-IR）、X射线衍射（XRD）、场发射扫描电镜（FESEM）对所制备复合电极进行了表征，采用循环伏安法（CV）、交流阻抗法（EIS）考察了复合电极的电化学性能。将GR/PANI膜阳极应用于固定床微生物燃料电池（MFC），考察了电池的产电性能。均匀地附着在石墨烯表面，GR/PANI膜电极具有良好可逆性，其电阻小、导电性良好。GR/PANI膜阳极应用于MFC，最大功率密度和开路电压分别为230.2 mW·m^-2和834.6 mV，比未修饰阳极的最大功率密度和开路电压分别提高了110.6%和34.8%，GR/PANI膜阳极的表观内阻也由未修饰阳极的843.2Ω降低为469.4 Ω，且电池启动时间大大缩短，产电稳定性增强。结果表明，GR/PANI复合物是一种优良的电极材料，GR/PANI膜阳极MFC具有良好的产电性能。

Preparation and application of GR/PANI composite anode for MFC

Graphene (GR) was synthesized from natural graphene powder by chemical oxidation-reduction method. Graphene/polyaniline (GR/PANI) film anode was prepared by electrochemical modification and used in fixed-bed microbial fuel cell (MFC) to examine the electrochemical performance of the prepared anodes. The prepared anodes were characterized by IR spectrum, X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM), respectively. The electrochemical properties were studied by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Polyaniline evenly attached to graphene and GR/PANI film electrode had good reversibility, small resistance and good electrical conductivity. When the GR/PANI film anode was used in MFC, maximum output power density and open circuit voltage were up to 230.2 mW·m^-2 and 834.6 mV respectively, 110.6% and 34.8% higher than those of unmodified anode. The resistance of GR/PANI film anode also decreased from 843.2 Ω of the unmodified anode to 469.4 Ω. The experiment results indicated that, the GR/PANI composite was an excellent electrode material, and the MFC with GR/PANI film anode showed good electricity production performance.