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Bioelectrocatalytic oxidation and reduction of different substrates using carbon nanostructured electrodes

Abstract : The aim of this thesis is to explore the formulations, characterizations and practical applications of buckypapers (BPs) as electrode material for enzymatic biofuel cells (EFCs). The thesis starts with a general introduction about EFCs in chapter 1. Chapter 2 concerns the comparison of commercial and laboratory-made BP. Commercial BP is macroporous and possesses higher oxygen content but more ordered and looser structure with significantly wider diameter nanotubes. Lab-made BP is mesoporous and possesses 9-times higher specific surface area. The latter also shows superior performance for oxygen reduction when immobilized with bilirubin oxidase (BOx). The third chapter investigates the effect of alginate hydrogel coating on bioanode stability for glucose oxidation. The hydrogel coating was prepared by drop-casting alginate/CaCO3 mixture, followed by addition of gluconolactone to form uniform hydrogel film by ionic cross-linking. Both operational and storage stability have been improved compared to the uncoated electrode. The fourth chapter describes a wearable lactate/O2 EFC by the integration of flexible buckypaper bioelectrodes and a screen-printed stretchable substrate. The assembled EFC was able to maintain its performance stability under stretching conditions and could power a LED in both pulse and continuous discharge mode. The last chapter presented the self-assembly, characterization of redox-active nanoparticles entrapped with mediators. The cathode could deliver a current density of 4 μA cm−2 with BOx and redox-active nanoparticles in solution.
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Xiaohong Chen. Bioelectrocatalytic oxidation and reduction of different substrates using carbon nanostructured electrodes. Inorganic chemistry. Université Grenoble Alpes, 2019. English. ⟨NNT : 2019GREAV076⟩. ⟨tel-03365929⟩

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