Journal
EXTREMOPHILES
Volume 15, Issue 6, Pages 633-642Publisher
SPRINGER JAPAN KK
DOI: 10.1007/s00792-011-0394-z
Keywords
Electricity generation; MFC; Escherichia coli; Haloferax volcanii; Natrialba magadii; Nafion
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Funding
- National Council for Scientific and Technical Research (CONICET)
- Agency for Scientific and Technical Promotion (AGENCIA)
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In this work, two archaea microorganisms (Haloferax volcanii and Natrialba magadii) used as biocatalyst at a microbial fuel cell (MFC) anode were evaluated. Both archaea are able to grow at high salt concentrations. By increasing the media conductivity, the internal resistance was diminished, improving the MFC's performance. Without any added redox mediator, maximum power (P (max)) and current at P (max) were 11.87/4.57/0.12 mu W cm(-2) and 49.67/22.03/0.59 mu A cm(-2) for H. volcanii, N. magadii and E. coli, respectively. When neutral red was used as the redox mediator, P (max) was 50.98 and 5.39 mu W cm(-2) for H. volcanii and N. magadii, respectively. In this paper, an archaea MFC is described and compared with other MFC systems; the high salt concentration assayed here, comparable with that used in Pt-catalyzed alkaline hydrogen fuel cells, will open new options when MFC scaling up is the objective necessary for practical applications.
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