期刊
BIORESOURCE TECHNOLOGY
卷 138, 期 -, 页码 353-358出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.03.187
关键词
Microbial fuel cell; Power overshoot; Capacitance; Exoelectrogenic biofilm
资金
- National Natural Science Foundation of China (NSFC) [21107053, 21037002]
- Tianjin Research Program of Application Foundation and Advanced Technology [13JCQNJC08000]
- National Science & Technology Program of China on Water Pollution Control and Treatment [2012ZX07501002]
Power overshoot commonly makes the performance evaluation of microbial fuel cells (MFCs) inaccurate. Here, three types of carbon with different capacitance (ultracapacitor activated carbon (UAC), plain activated carbon (PAC) and carbon black (CB)) rolled on stainless steel mesh (SSM) as anodes to investigate the relationship between overshoot and anodic capacitance. It was not observed in all cycles of UAC-MFCs (from Cycle 2 to 4) due to the largest abiotic capacitance (C-m(abiotic)) of 2.1 F/cm(2), while this phenomenon was eliminated in PAC-MFCs (C-m(abiotic) = 1.6 F/cm(2)) from Cycle 3 and in CB-MFCs (C-m(abiotic) = 0.5 F/cm(2)) from Cycle 4, indicated that the C-m(abiotic) of the anode stored charges and functioned as electron shuttle to overcome the power overshoot. With bacterial colonization, the transient charge storage in biofilm resulted in a 0.1-0.4 F/cm(2) increase in total capacitance for anodes, which was the possible reason for the elimination of power overshoot in PAC/CB-MFCs after multi cycle acclimation. (C) 2013 Elsevier Ltd. All rights reserved.
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