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Separator electrode assembly (SEA) with 3-dimensional bioanode and removable air-cathode boosts microbial fuel cell performance

Abstract : Separator electrode assemblies (SEAs) were designed by associating a microbial anode with an air-cathode on each side of three different kinds of separator: plastic grid, J-cloth and baking paper. The SEA was designed to allow the air-cathode be removed and replaced without disturbing the bioanode. Power densities up to 6.4 W m−2 were produced by the Grid-SEAs (on average 5.9 ± 0.5 W m−2) while JCloth-SEAs and Paper-SEAs produced 4.8 ± 0.3 and 1.8 ± 0.1 W m−2, respectively. Power densities decreased with time mainly because of fast deterioration of the cathode kinetics. They always increased again when the air-cathodes were replaced by new ones; the Grid-SEAs were thus boosted above 4 W m−2 after 7 weeks of operation. The theoretical analysis of SEA functioning suggested that the high performance of the Grid-SEAs was due to the combination of several virtuous phenomena: the efficient pH balance thanks to free diffusion through the large-mesh grid, the likely mitigation of oxygen crossover thanks to the 3-dimensional structure of the bioanode and the possibility of overcoming cathode fouling by replacing it during MFC operation. Finally, the microbial community of all bioanodes showed stringent selection of Proteiniphilum acetatigenes in proportion with the performance.
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https://hal.archives-ouvertes.fr/hal-01842360
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Submitted on : Wednesday, July 18, 2018 - 11:04:51 AM
Last modification on : Tuesday, May 4, 2021 - 3:41:00 PM
Long-term archiving on: : Friday, October 19, 2018 - 7:47:54 PM

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Manon Oliot, Luc Etcheverry, Annette Mosdale, Régine Basséguy, Marie-Line Délia-Dupuy, et al.. Separator electrode assembly (SEA) with 3-dimensional bioanode and removable air-cathode boosts microbial fuel cell performance. Journal of Power Sources, Elsevier, 2017, 356, pp.389-399. ⟨10.1016/j.jpowsour.2017.03.016⟩. ⟨hal-01842360⟩

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