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Insights on the resistance,capacitance and bioelectricity generation of microbial fuel cells by electrochemical impedance studies
Affiliation:1. Electrochemical Systems Laboratory, SRM Research Institute, SRM Institute of Science and Technology, Kattankulathur, 603203, India;2. Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, 603203, India;3. Department of Chemistry, SRM University, Kattankulathur, 603203, India;1. The Biosensor and Bioelectronics Technology Centre, The Research and Technology Center for Renewable Products and Energy, King Mongkut''s University of Technology North Bangkok, Bangkok, 10800, Thailand;2. Department of Agro-Industrial, Food and Environmental Technology, Faculty of Applied Science, King Mongkut''s University of Technology North Bangkok, Bangkok, 10800, Thailand;3. Key Laboratory of Development and Application of Rural Renewable Energy, Biomass Energy Technology Research Centre, Biogas Institute of Ministry of Agriculture, Chengdu, 610041, China;1. China University of Petroleum (East China), Qingdao 266580, China;2. Research Institute of Petroleum Engineering of Shengli Oilfield, Sinopec, Dongying 257000, China;3. Shanghai Witsun Jetdrill Enhancement Services Co., Ltd, Shanghai 200000, China;4. Well Testing Company of CNPC Daqing Oilfield, Daqing 163000, China;1. Xi''an University of Technology, Xi''an, Shaanxi, 710048, China;2. Key Laboratory of Thermo-Fluid Science and Engineering of MOE, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, China;1. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;2. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China
Abstract:Electrochemical Impedance Spectroscopy is employed to understand the role of anodic capacitance and individual component resistance in the bioelectricity generation of microbial fuel cells.The anodic capacitance during initial bacterial growth and biofilm formation (1–9 days) is 6 times higher than the literature data.The power density calculated on day 24 being 0.497 W/m2 which is approximately 3 times higher than the literature data.The maximum columbic efficiency obtained is 30.8% which is 2.8 times higher than literature. These results demonstrate that the mixed culture bacteria is more efficient in bioelectricity generation in microbial fuel cells and the anodic capacitance due to biofilm growth on anode plays an important role in the power generation of microbial fuel cells. The electrode resistance dominates over solution resistance due to Hydrogen Evolution and Oxygen Reduction Reactions.
Keywords:Microbial fuel cells  Biofilm capacitance  Coulombic efficiency  Power density  Biofilm formation  Anodic polarization resistance  Solution Resistance (SR)  Anode Polarization Resistance (APR)  Cathode Polarization Resistance (CPR)  Anode Capacitance (AC)  Cathode Capacitance (CC)
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