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| Electrical performance of soil microbial fuel cells with a graphite-inorganic silica gel composite anode |
| Received:June 02, 2020 |
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| KeyWord:bioelectrochemistry;exoelectrogenic bacteria;paddy soil;new energy;microbial fuel cells |
| Author Name | Affiliation | E-mail | | LU Yu | School of Environment, Nanjing Normal University, Nanjing 210023, China
Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, Nanjing 210023, China | | | ZHOU Feng-wu | School of Geography Science, Nanjing Normal University, Nanjing 210023, China
Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, Nanjing 210023, China | | | ZHONG Wen-hui | School of Geography Science, Nanjing Normal University, Nanjing 210023, China
Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, Nanjing 210023, China | | | LIU Li | School of Environment, Nanjing Normal University, Nanjing 210023, China
Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, Nanjing 210023, China | | | LI Xiao-fang | Center for Agricultural Resources Research, IGDB, CAS, Shijiazhuang 050022, China | | | DENG Huan | School of Environment, Nanjing Normal University, Nanjing 210023, China
Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, Nanjing 210023, China | hdeng@njnu.edu.cn |
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| Abstract: |
| Soil microbial fuel cells(MFC)generate electrical energy through the conversion of chemical energy that originates from the decomposition of organic matter by soil exoelectrogenic bacteria. The aim of this study was to improve the electrical performance of soil MFC, so as to utilize them as a new energy source to power electronic devices in situ. A novel composite material containing graphite, carbon felt, and titanium wire was invented as the anode of soil MFC in paddy soil. Two soil MFCs were serially connected to obtain adequate voltage and power output to run an electronic timer. Maximum power density was evaluated using polarization curve, and anodic charge transfer resistance was determined via electrochemical impedance spectroscopy. RNA was extracted from soil samples on the anode surface, and the cDNA produced by reverse transcription of 16S rRNA was sequenced. High-throughput sequencing was used to characterize the diversity and composition of the active exoelectrogenic bacteria-associated genera in the soil. The soil MFCs produced a voltage in the range of 1 403.3~1 579.9 mV and steadily ran the electronic timer for 30 days. Then, the timer was removed to electrochemically test the soil MFCs. The power density curve showed that the maximum power density and output power of the serially-connected soil MFCs were 5.45 mW·m-2 and 158.42 μW, respectively. Electrochemical impedance spectroscopy analysis showed that the anodic charge transfer resistances of the two individual soil MFCs were 16.46 Ω and 16.80 Ω. High-throughput sequencing revealed 14 active exoelectrogenic bacteria-associated genera on the anode. The amount of 16S rRNA generated by Geobacter, Bacillus, Clostridium, Pseudomonas, or Desulfobulbus accounted for more than 10% of all exoelectrogenic bacteria-associated genera, and they were therefore the most active exoelectrogenic bacteria-associated genera. |
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