Effects of hydraulic pressure on the performance of single chamber air-cathode microbial fuel cells

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• 作者：Shaoan Cheng ; ^{shaoancheng@zju.edu.cn" class="auth_mail} ; Weifeng Liu ; Jian Guo ; Dan Sun ; Bin Pan ; Yaoli Ye ; Weijun Ding ; Haobin Huang ; Fujian Li
• 关键词：Microbial fuel cell ; Hydraulic pressure ; Water flooding ; Metabolism suppression
• 刊名：Biosensors and Bioelectronics
• 出版年：15 June, 2014
• 年：2014
• 卷：56
• 期：Complete
• 页码：264-270
• 全文大小：2351 K

文摘

Scaling up of microbial fuel cells (MFCs) without losing power density requires a thorough understanding of the effect of hydraulic pressure on MFC performance. In this work, the performance of an activated carbon air-cathode MFC was evaluated under different hydraulic pressures. The MFC under 100 mmH₂O hydraulic pressure produced a maximum power density of 1260卤24 mW m^-2, while the power density decreased by 24.4% and 44.7% as the hydraulic pressure increased to 500 mmH₂O and 2000 mmH₂O, respectively. Notably, the performance of both the anode and the cathode had decreased under high hydraulic pressures. Electrochemical impedance spectroscopy tests of the cathode indicated that both charge transfer resistance and diffusion transfer resistance increased with the increase in hydraulic pressure. Denaturing gradient gel electrophoresis of PCR-amplified partial 16S rRNA genes demonstrated that the similarity among anodic biofilm communities under different hydraulic pressures was 鈮?0%, and the communities of all MFCs were dominated by Geobacter sp. These results suggested that the reduction in power output of the single chamber air-cathode MFC under high hydraulic pressures can be attributed to water flooding of the cathode and suppression the metabolism of anodic exoelectrogenic bacteria.