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Multiple electron transfer systems in oxygen reducing biocathodes revealed by different conditions of aeration/agitation

Rimboud, Mickaël and Bergel, Alain and Erable, Benjamin Multiple electron transfer systems in oxygen reducing biocathodes revealed by different conditions of aeration/agitation. (2016) Bioelectrochemistry, vol. 110. pp. 46-51. ISSN 1567-5394

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Official URL: http://dx.doi.org/10.1016/j.bioelechem.2016.03.002

Abstract

Oxygen reducing biocathodes were formed at − 0.2 V/SCE (+ 0.04 V/SHE) from compost leachate. Depending on whether aeration was implemented or not, two different redox systems responsible for the electrocatalysis of oxygen reduction were evidenced. System I was observed at low potential (− 0.03 V/SHE) on cyclic voltammetries (CVs). It appeared during the early formation of the biocathode (few hours) and resisted the hydrodynamic conditions induced by the aeration. System II was observed at higher potential on CV (+ 0.46 V/SHE); it required a longer lag time (up to 10 days) and quiescent conditions to produce an electrochemical signal. The hydrodynamic effects produced by the forced aeration led to its extinction. From their different behaviors and examples in the literature, system I was identified as being a membrane-bound cytochrome-related molecule, while system II was identified as a soluble redox mediator excreted by the biofilm. This study highlighted the importance of controlling the local hydrodynamics to design efficient oxygen reducing biocathodes able to operate at high potential.

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/journal/15675394/110/supp/C
HAL Id:hal-01360003
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)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Benjamin ERABLE
Deposited On:22 Aug 2016 09:36

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