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The current provided by oxygen-reducing microbial cathodes is related to the composition of their bacterial community

Rimboud, Mickaël and Desmond-Le Quemener, Elie and Erable, Benjamin and Bouchez, Théodore and Bergel, Alain The current provided by oxygen-reducing microbial cathodes is related to the composition of their bacterial community. (2015) Bioelectrochemistry, vol. 102. pp. 42-49. ISSN 1567-5394

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Official URL: http://dx.doi.org/10.1016/j.bioelechem.2014.11.006

Abstract

Oxygen reducing biocathodes were formed from sludge under constant polarization at − 0.2 and + 0.4 V/SCE. Under chronoamperometry at pH 10.3 ± 0.3, current densities of 0.21 ± 0.03 and 0.12 ± 0.01 A m− 2 were displayed at − 0.2 V/SCE by the biocathodes formed at − 0.2 and 0.4 V/SCE, respectively. Voltammetry revealed similar general characteristics for all biocathodes and higher diffusion-limited current densities (0.84 ± 0.26 A m− 2) than chronoamperometry. Up to 3.7 A m− 2 was reached under air bubbling. A theoretical model was proposed to show the consistency of the chronoamperometric and voltammetric data. The biocathodes formed at − 0.2 V/ECS that gave the highest electrochemical performance showed a homogeneous selection of Deinococcus–Thermus and Gemmatimonadetes, while the biocathodes formed at 0.4 V/SCE were enriched in different bacteria. The biocathode that led to the worst electrochemical characteristics, while formed at − 0.2 V/SCE, showed the largest bacterial diversity. The biocathode performance was consequently related to the enrichment in specific microbial phyla. Moreover, the strong presence of bacteria parented to Deinococci may also have some interest in biotechnology.

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 Bioelectrochemistry website : http://www.sciencedirect.com/science/article/pii/S1567539414001923
HAL Id:hal-01149734
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut national de Recherche en Sciences et Technologies pour l'Environnement et l'Agriculture - IRSTEA (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
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Deposited By: Benjamin ERABLE
Deposited On:07 May 2015 13:41

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