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Lowering the applied potential during successive scratching/re-inoculation improves the performance of microbial anodes for microbial fuel cells

Ketep, Stephanie F. and Bergel, Alain and Bertrand, Marie and Achouak, Wafa and Fourest, Eric Lowering the applied potential during successive scratching/re-inoculation improves the performance of microbial anodes for microbial fuel cells. (2013) Bioresource Technology, vol. 127. pp. 448-455. ISSN 0960-8524

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Official URL: http://dx.doi.org/10.1016/j.biortech.2012.09.008

Abstract

Microbial anodes were formed under polarisation at -0.2 V/SCE on smooth graphite plate electrodes with paper mill effluents. Primary, secondary and tertiary biofilms were formed by a successive scratching and re-inoculation procedure. The secondary and tertiary biofilms formed while decreasing the polarisation potential allowed the anodes to provide current density of 6 A/m² at -0.4 V/SCE. In contrast, applying -0.4 V/SCE initially to form the primary biofilms did not lead to the production of current. Consequently, the scratching/re-inoculation procedure combined with progressive lowering of the applied potential revealed an efficient new procedure that gave efficient microbial anodes able to work at low potential. The observed progressive pH drift to alkaline values above 9 explained the open circuit potentials as low as -0.6 V/SCE. The remarkable performance of the electrode at alkaline pH was attributed to the presence of Desulfuromonas acetexigens as the single dominant species in the tertiary microbial anodes.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF can be found at Bioresource Technology website: http://www.sciencedirect.com/science/article/pii/S0960852412013454
HAL Id:hal-00877380
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Centre Technique du Papier - CTP (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
Other partners > Université de la Méditerranée - Aix-Marseille II (FRANCE)
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Deposited By: Vincent GERBAUD
Deposited On:28 Oct 2013 12:37

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