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Electrochemical activity of Geobacter sulfurreducens biofilms on stainless steel anodes

Dumas, Claire and Basséguy, Régine and Bergel, Alain Electrochemical activity of Geobacter sulfurreducens biofilms on stainless steel anodes. (2008) Electrochimica Acta, vol. 5 (n° 16). pp. 5235-5241. ISSN 0013-4686

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Official URL: http://dx.doi.org/10.1016/j.electacta.2008.02.056

Abstract

Stainless steel was studied as anode for the biocatalysis of acetate oxidation by biofilms of Geobacter sulfurreducens. Electrodeswere individually polarized at different potential in the range−0.20V to +0.20V vs. Ag/AgCl either in the same reactor or in different reactors containing acetate as electron donor and no electron acceptor except the working electrode. At +0.20V vs. Ag/AgCl, the current increased after a 2-day lag period up to maximum current densities around 0.7Am−2 and 2.4Am−2 with 5mMand 10mM acetate, respectively. No current was obtained during chronoamperometry (CA) at potential values lower than 0.00V vs. Ag/AgCl, while the cyclic voltammetries (CV) that were performed periodically always detected a fast electron transfer, with the oxidation starting around −0.25V vs. Ag/AgCl. Epifluorescent microscopy showed that the current recorded by chronoamperometrywas linked to the biofilm growth on the electrode surface, while CVswere more likely linked to the cells initially adsorbed from the inoculum. A model was proposed to explain the electrochemical behaviour of the biofilm, which appeared to be controlled by the pioneering adherent cells playing the role of “electrochemical gate” between the biofilm and the electrode surface.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Electrochimica Acta website : Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Electrochimica Acta website : http://www.sciencedirect.com/science/journal/00134686
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Bioprocédés et systèmes microbiens (BioSyM)
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Deposited By: Regine BASSEGUY
Deposited On:24 Sep 2008 13:39

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