期刊
BIOSENSORS & BIOELECTRONICS
卷 24, 期 4, 页码 900-905出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2008.07.034
关键词
Microbial fuel cells (MFCs); Acidity; Shewanella oneidensis; Mediated electron transfer
类别
资金
- Office of Naval Research [62123N]
- Air Force Office of Scientific Research [FA9550-06-1-0292]
- US Air Force Research Laboratory
- Materials Science Directorate (AFRL-RX)
- National Research Council
Microbial fuel cells (MFCs) traditionally operate at pH values between 6 and 8. However, the effect of pH on the growth and electron transfer abilities of Shewanella oneidensis MR-1 (wild-type) and DSP10 (spontaneous mutant), bacteria commonly used in MFCs, to electrodes has not been examined. Miniature MFCs using bare graphite felt electrodes and nanoporous polycarbonate membranes with MR-1 or DSP10 cultures generated >8 W/m(3) and similar to 400 mu A between pH 6-7. The DSP10 strain significantly outperformed MR-1 at neutral pH but underperformed at pH 5. Higher concentrations of DSP10 were sustained at pH 7 relative to that of MR-1, whereas at pH 5 this trend was reversed indicating that cell count was not solely responsible for the observed differences in current. S. oneidensis MR-1 was determined to be more suitable than DSP10 for MFCs with elevated acidity levels. The concentration of riboflavin in the bacterial cultures was reduced significantly at pH 5 for DSP10, as determined by high performance liquid chromatography (HPLC) of the filter sterilized growth media. In addition, these results suggest that mediator biosynthesis and not solely bacterial concentration plays a significant role in current output from S. oneidensis containing MFCs. Published by Elsevier B.V.
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