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Synthèse de nanocatalyseurs métalliques supportés pour l'électrooxydation du glucose : application en pile implantable

Abstract : Supplying durable power to implanted electronic devices is a major challenge in medicine and bio-monitoring fields. Due to glucose renewability and presence in biological organisms, Glucose/Oxygen fuel cell is a power source adapted to these applications. In this work, catalysts made of gold and platinum nanoparticles, dispersed on carbon supports such as Vulcan, graphene oxide (GO) and reduced graphene oxide (rGO), were synthesized by two methods (Bromide Anion Exchange - BAE and polyol). These mono- (Pt, Au) and bi-metallic (AuxPty) catalysts were used as fuel cell anode to be implanted in an animal for powering a health monitoring device. Physico-chemical characterizations (Raman, MET, DRX, XPS) of materials permitted to determine their structure, their surface composition, and the metal-support interactions. Then, electrochemical techniques (voltammetry, CO-stripping and chronoamperometry) permitted to reveal their activity towards glucose oxidation and oxygen reduction reactions and their stability in alkaline and phosphate media. During glucose/O2 fuel cell testings with anion exchange membrane, Pt/rGO was the most efficient catalyst, and Pt-rich bimetallic materials were the most stable. In PBS buffer, fuel cell performances depicted by open circuit voltage (OCV) and power density (Pj) reached 0.7 V and 28 microW.cm-2 respectively. Without membrane, the mixing of reactants, near-implantation conditions, caused an inhibition effect on OCV (0.4 V) and power density (8 µW.cm-2).Chromatographic analysis and mass spectrometry permitted to identify gluconate and glucuronate as sole glucose oxidation products, which are non-toxic and value-added chemicals.
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Charly Lemoine. Synthèse de nanocatalyseurs métalliques supportés pour l'électrooxydation du glucose : application en pile implantable. Catalyse. Université de Poitiers, 2019. Français. ⟨NNT : 2019POIT2309⟩. ⟨tel-02864515⟩

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