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Biominéralisation d'oxydes de manganèse pour le stockage électrochimique de l'énergie

Abstract : In this study, we highlighted the ability of a bacterial strain to produce by biomineralization a material to store electrochemical energy. The study focused on the culture under different conditions of the Pseudomonas putida MnB1 strain, a Mn-oxidising bacterium, with the ability to produce a manganese oxide by Mn2+ oxidation. Under planktonic conditions (agitation of the culture medium), the Mn2+ added to the solution was entirely oxidised by the bacterial strain and led to the precipitation of a birnessite-type lamellar manganese oxide MnO2. The electrochemical tests of this biogenic birnessite indicate that this mineral has an electrochemical activity of intercalation of lithium ions and presents an electrochemical capacity close to the theoretical capacity of MnO2. The texture produced by biomineralization allows good electrochemical performances and this interesting property led us to explore the production of an electrode in a one-step process. For this purpose, we wanted to produce a biomineralized biofilm with the Pseudomonas putida strain directly grown on a current collector. The results show that it is possible to form an electrode in one-step, consisting of a biofilm with manganese oxides and exhibiting electrochemical activity. The absence of agitation, necessary for the formation of this biofilm, induces a decrease of bacterial oxidation rate and therefore a decrease in the precipitation of manganese in the biofilm. Then, the optimisation of the culture conditions (i.e. culture temperature, luminosity and polarisation of the support) made it possible to select a condition promoting the colonisation of the biofilm and the precipitation of highly textured manganese oxides. The electrochemical results of this optimised electrode show an improvement of cyclability. It would be interesting to use this biomineralization process to produce a ternary electrode material (i.e. containing an alkali ion) to form a complete battery electrode.
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Submitted on : Monday, December 6, 2021 - 3:57:11 PM
Last modification on : Tuesday, January 4, 2022 - 5:53:31 AM


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  • HAL Id : tel-03467610, version 1


Laura Galezowski. Biominéralisation d'oxydes de manganèse pour le stockage électrochimique de l'énergie. Science des matériaux [cond-mat.mtrl-sci]. Sorbonne Université, 2021. Français. ⟨NNT : 2021SORUS095⟩. ⟨tel-03467610⟩



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