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Forming microbial anodes under delayed polarisation modifies the electron transfer network and decreases the polarisation time required.

Pocaznoi, Diana and Erable, Benjamin and Etcheverry, Luc and Délia, Marie-Line and Bergel, Alain Forming microbial anodes under delayed polarisation modifies the electron transfer network and decreases the polarisation time required. (2012) Bioresource technology, vol. 114 . pp. 334-341. ISSN 1873-2976

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Official URL: http://dx.doi.org/10.1016/j.biortech.2012.03.042

Abstract

Microbial anodes were formed from compost leachate on carbon cloth electrodes. The biofilms formed at the surface of electrodes kept at open circuit contained microorganisms that switched their metabolism towards electrode respiration in response to a few minutes of polarisation. When polarisation at -0.2 V/SCE (+0.04 V/SHE) was applied to a pre-established biofilm formed at open circuit (delayed polarisation), the bacteria developed an extracellular electron transport network that showed multiple redox systems, reaching 9.4 A/m(2) after only 3-9 days of polarisation. In contrast, when polarisation was applied from the beginning, bacteria developed a well-tuned extracellular electron transfer network concomitantly with their growth, but 36 days of polarisation were required to get current of the same order (6-8 A/m(2)). The difference in performance was attributed to the thinner, more heterogeneous structure of the biofilms obtained by delayed polarisation compared to the thick uniform structure obtained by full polarisation.

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 Bioresource technology website : http://dx.doi.org/10.1016/j.biortech.2012.03.042
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Bioprocédés et systèmes microbiens (BioSyM)
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Deposited By:Benjamin ERABLE

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