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Applied and Environmental Microbiology, July 2008, p. 4472-4476, Vol. 74, No. 14
0099-2240/08/$08.00+0     doi:10.1128/AEM.00209-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Preferential Use of an Anode as an Electron Acceptor by an Acidophilic Bacterium in the Presence of Oxygen{triangledown}

Moustafa Malki,1,2 Antonio L. De Lacey,1* Nuria Rodríguez,3 Ricardo Amils,2,3 and Victor M. Fernandez1

Instituto de Catálisis, CSIC, Madrid, Spain,1 Centro de Biología Molecular, Universidad Autónoma de Madrid, Madrid, Spain,2 Centro de Astrobiología, CSIC-INTA, Torrejón de Ardoz, Spain3

Received 23 January 2008/ Accepted 10 May 2008

Several anaerobic metal-reducing bacteria have been shown to be able to donate electrons directly to an electrode. This property is of great interest for microbial fuel cell development. To date, microbial fuel cell design requires avoiding O2 diffusion from the cathodic compartment to the sensitive anodic compartment. Here, we show that Acidiphilium sp. strain 3.2 Sup 5 cells that were isolated from an extreme acidic environment are able to colonize graphite felt electrodes. These bacterial electrodes were able to produce high-density electrocatalytic currents, up to 3 A/m2 at a poised potential of +0.15 V (compared to the value for the reference standard calomel electrode) in the absence of redox mediators, by oxidizing glucose even at saturating air concentrations and very low pHs.

* Corresponding author. Mailing address: Instituto de Catálisis, CSIC, c/Marie Curie 2, Cantoblanco, 28049 Madrid, Spain. Phone: 34-915854928. Fax: 34-915854760. E-mail: alopez{at}icp.csic.es

{triangledown} Published ahead of print on 16 May 2008.

Applied and Environmental Microbiology, July 2008, p. 4472-4476, Vol. 74, No. 14
0099-2240/08/$08.00+0     doi:10.1128/AEM.00209-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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Copyright © 2008 by the American Society for Microbiology. All rights reserved.