期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 12, 期 8, 页码 1140-1143出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2010.06.005
关键词
Fluorescence; Microbial fuel cells; Quinone; Shuttle; Confocal laser scanning microscopy
资金
- National Science Foundation of China [20876160]
- National High Technology Research and Development Program of China (863 Program) [2007AA05Z158]
In microbial fuel cells (MFCs), the electron transfer from microorganisms to the cell anode is a decisive factor on the power output. Though quinone derivatives can function as electron shuttles, the electron shuttle pathways have so far not been demonstrated. In this paper, the mechanism of electron shuttle via an exogenous mediator was studied in MFCs using Geobacter metallireducens (G. metallireducens). 1-hydroxy-4-aminoanthraquinone was labeled by fluorescamine and the product (HAQ-F) showed strong and stable fluorescence. The addition of HAQ-F into MFCs increased cell voltage from 170 mV to 290 mV, suggesting that the redox mediator could facilitate electron transfer from bacteria to anode. Further, confocal laser scanning microscopy imaging indicated that HAQ-F was present in microbial cells, demonstrating that the redox mediator shuttled across the membranes to get reduced within cells. (C) 2010 Elsevier B.V. All rights reserved.
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