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

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.
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Submitted on : Thursday, September 20, 2018 - 10:48:27 AM
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Manon Oliot, Benjamin Erable, Marie-Line De Solan, Alain Bergel. Increasing the temperature is a relevant strategy to form microbial anodes intended to work at room temperature. Electrochimica Acta, Elsevier, 2017, 258, pp.134-142. ⟨10.1016/j.electacta.2017.10.110⟩. ⟨hal-01877656⟩



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