Journal
BIOELECTROCHEMISTRY
Volume 93, Issue -, Pages 23-29Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2012.05.002
Keywords
Microbial bioelectrochemical systems; Microbial fuel cells; Bacterial electron transfer; Shewanella putrefaciens; Cyclic voltammetry
Funding
- DAAD
- Fonds der Chemischen Industrie (FCI)
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Shewanellaceae are among the most widely studied electroactive microorganisms. In this report, we studied the influence of the applied electrode potential on the anodic current production of Shewanella putrefaciens NCTC 10695 under anoxic conditions. Furthermore, we used cyclic voltammetry (CV) and confocal laser scanning microscopy (CLSM) to investigate the microbial electron transfer and biofilm formation. It is shown that the chronoamperometric current density is increasing with increasing electrode potential from 3 mu A cm(-2) at -0.1 V up to similar to 12 mu A cm(-2) at +0.4 V (vs. Ag/AgCl), which is accompanied by an increasing amount of biomass deposited on the electrode. By means of cyclic voltammetty we demonstrate that direct electron transfer (DET) is dominating and the planktonic cells play only a minor role. (C) 2012 Elsevier B.V. All rights reserved.
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