氧化石墨烯与聚苯胺修饰阴极的微生物燃料电池电化学性能

Electrochemical performance of microbial fuel cell with graphene oxide and polyaniline modified cathode

利用聚苯胺(PANI)与氧化石墨烯(GO)来修饰微生物燃料电池(MFC)阴极电极,可以加强氧阴极还原速率并且降低阴极电势损失.本文利用扫描电镜(SEM)、元素分析(XRD)、红外光谱(FTIR)、CV曲线与EIS曲线分析等手段,考察PANI与GO联合修饰MFC阴极的方法及其电化学性能改善效果.结果表明在聚合修饰液中,当苯胺浓度为0.1M时,GO的最佳浓度为0.10~0.12g/L,此时修饰电极的氧还原峰电位最高,CV测试电活性面积最大,EIS的测试表明此时阴极传荷内阻达到最小.研究显示通过使用GO与PANI来共同修饰微生物燃料电池阴极可以使阴极的高电化学活性更高,可提高MFC的最大电压和最大电容.研究结果对优化,MFC的应用与运行具有借鉴意义.

In microbial fuel cells(MFC),the cathodic reaction rate of oxygen reduction as an electron acceptor is slow,causing a loss of cathode potential.Polyaniline and graphene oxide are used to modify the MFC cathode,which can enhance the oxygen reduction rate and decrease the cathode potential loss.Scanning Electron Microscopy(SEM),X-ray Diffraction Analysis(XRD),Fourier Transform Infrared Spectroscopy(FTIR),Cyclic Voltammetry(CV)and Electrochemical Impedance Spectroscopy(EIS)were used to investigate the modification of an MFC cathode by polyaniline and graphene oxide and to quantify the improvement if its electrochemical performance.The results show that the oxygen reduction peak potential of the modified electrode is the highest and the electroactive area of the CV text is the largest when the concentration of polyaniline is 0.1M and that the optimum concentration of graphene oxide is 0.1~0.12g/L.This indicates that the internal resistance of the modified cathode is minimized.It is concluded that by modifying the cathode with graphene and polyaniline,the MFC can exhibit higher electrochemical activity,higher output voltage and capacitance.The study is beneficial for ameliorating the application and operation of microbial fuel cells.