Sizes of Anode and Cathode Affect Electricity Generation in Rice Paddy-Field Microbial Fuel Cells
Sizes of Anode and Cathode Affect Electricity Generation in Rice Paddy-Field Microbial Fuel Cells作者机构：School of Life Sciences Tokyo University of Pharmacy and Life Sciences Tokyo Japan Technical Research Institute Maeda Corporation Tokyo Japan
出 版 物：《Journal of Sustainable Bioenergy Systems》 (可持续生物质能源系统（英文）)
年 卷 期：2016年第6卷第1期
页 面：10-15页
主 题：Root Exudates Polarization Analyses Pyrosequencing 16S rRNA Gene Geobacter
摘 要：Rice paddy-field microbial fuel cells (RPF-MFCs) are devices that exploit rhizosphere bacteria to generate electricity from soil organic matter, including those excreted from roots. Previous studies have examined factors affecting electric outputs from RPF-MFCs and demonstrated that RPFMFC was able to generate electricity up to 80 mW·m-2 (based on the projected area of anode). The present study operated RPF-MFCs with different sizes of anodes and cathodes and examined how electrode sizes affected electricity generation. We show that anodes are the limiting factor for electricity generation immediately after commencing the operation, while cathodes become the limiting factor after anode performances are sufficiently increased. RPF-MFC achieved the maximum power density of 140 mW·m-2 (based on the projected area of anode), when the cathode is sufficiently larger than the anode. Results suggest that the cathode needs to be improved for eliciting the maximum capacity of rhizosphere bacteria for electricity generation in RPF-MFC.
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