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Increasing the temperature is a relevant strategy to form microbial anodes intended to work at room temperature

Oliot, Manon and Erable, Benjamin and Solan, Marie-Line de and Bergel, Alain Increasing the temperature is a relevant strategy to form microbial anodes intended to work at room temperature. (2017) Electrochimica Acta, 258. 134-142. ISSN 0013-4686

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Official URL: http://doi.org/10.1016/j.electacta.2017.10.110

Abstract

Reducing the time required for the formation of microbial anodes from environmental inocula is a great challenge. The possibility of reaching this objective by increasing the temperature during the bioanode preparation was investigated here. Microbial anodes were formed at 25 °C and 40 °C under controlled potential with successive acetate additions. At 25 °C, around 40 days were required to perform three acetate batches, which led to current density of 9.4 ± 2 A.m−2, while at 40 °C, 20 days were sufficient to complete three similar batches, leading to 22.9 ± 4.2 A.m−2. The bioanodes formed at 40 °C revealed three redox systems and those formed at 25 °C only one. The temperature also impacted the biofilm structure, which was less compact at 40 °C. When the bioanodes formed at 40 °C were switched to 25 °C, they produced current densities similar to those of bioanodes formed at 25 °C; they recovered the single redox system that was developed by the bioanodes formed at 25 °C and the difference in biofilm structures was mitigated. It is consequently fully appropriate to accelerate the formation of microbial anodes by increasing the temperatures to 40 °C even if they are finally intended to operate at room temperature.

Item Type:Article
HAL Id:hal-01877656
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)
Laboratory name:
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Agence Nationale de la Recherche (ANR)
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Deposited By: Loetitia MOYA
Deposited On:20 Sep 2018 08:48

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