Metal Free Polymer/Graphite Electrode-Ferricyanides Catholyte System for MFC with High Performance  

作　　者：Jiang Bolong Ulrich Kunz 

机构地区：[1]Innovation Institute for Sustainable Maritime Architecture Research and Technology,Qingdao University of Technology,Qingdao 266000 [2]Clausthal University of Technology,Institute of Chemical and Electrochemical Process Engineering,Germany

出　　处：《China Petroleum Processing & Petrochemical Technology》2020年第3期9-18,共10页中国炼油与石油化工（英文版）

基　　金：The authors would like to thank the Federal Ministry of Education and Research(Bundesministerium für Bildung und Forschung),BMBF,Germany,for funding parts of this study under the contract No.02WER1317D.

摘　　要：A Microbial fuel cell(MFC)with metal free polymer/graphite electrodes(150 mm×150 mm)was constructed.The electrodes with flowing channels,which were different in roughness,were designed.No additional catalyst was coated on the electrode,therefore the MFC was cheaper and possessed good durability with high performance.The effect of roughness,K3Fe(CN)6 concentration and sprayed air on the performance of the constructed MFC was investigated.Results showed that the roughness of electrode can significantly affect the performance of MFC.The power density of MFC increased by 1.56 times owing to the arithmetic mean roughness which has increased by 1.41 times.With an increasing K3Fe(CN)6 concentration,the performance of MFC also improves.The MFC with K3Fe(CN)6 only(30 mM)showed the highest power density of 1260 mW/m2,which is by 21.4 times and 1.3 times higher than those of MFCs with spraying air only(59 mW/m2)and with K3Fe(CN)6+air(1005 mW/m2),respectively.This showed that the appropriate concentration of K3Fe(CN)6 can significantly improve the power density,while the air has a negative effect when it is sprayed onto K3Fe(CN)6 catholyte.A coulombic efficiency of 34.2%and an energy efficiency of 13.3%with a COD degradation rate of 73.5%were achieved with MFC using K3Fe(CN)6 only.The overpotentials of MFC were also calculated.It can be seen that both theηohmic andηconcentration were very low as compared to theηactivation,and theηconcentration can be ignored because its effect was less than 3 mV.The theoretical calculation suggested that with an increasing conversion rate of K3Fe(CN)6,the cathode potential decreased and reached 0.31 V at a conversion rate of 0.99.While the anode behaves differently for constant pH and changeable pH as the reaction progresses,which reveals that the buffer solution and removal of protons play an important role in maintaining the anode potential.

关 键 词：microbial fuel cell wastewater treatment potassium ferricyanide air power production electrochemical performance metal free polymer/graphite electrode 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O646.5[理学—物理化学]