Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 12, Issue 4, Pages 505-508Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2010.01.026
Keywords
Oxygen reduction; Electrochemically active bacteria; Gram-positive bacteria; Cyclic voltammetry
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Funding
- FERMaT federative structure
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Most bacteria known to be electrochemically active have been harvested in the anodic compartments of microbial fuel cells (MFCs) and are able to use electrodes as electron acceptors. The reverse phenomenon, i.e. using solid electrodes as electron donors, is not so widely studied. To our knowledge, most of the electrochemically active bacteria are Gram-negative. The present study implements a transitory electrochemical technique (cyclic voltammetry) to study the microbial catalysis of the electrochemical reduction of oxygen. It is demonstrated that a wide range of aerobic and facultative anaerobic bacteria are able to catalyze oxygen reduction. Among these electroactive bacteria, several were Gram-positive. The transfer of electrons was direct since no activity was obtained with the filtrate. These findings, showing a widespread property among bacteria including Gram-positive ones, open new and interesting routes in the field of electroactive bacteria research. (C) 2010 Elsevier B.V. All rights reserved.
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