Lowering the potential of electroenzymatic glucose oxidation on redox hydrogel-modified porous carbon electrode

Aimi Suzuki (1) , Nicolas Mano (2, 3) , Seiya Tsujimura (1)

1 Division of Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba
2 CRPP - Centre de Recherche Paul Pascal
3 CRPP - Centre de recherches Paul Pascal

Herein, we demonstrate high current densities per projected surface area for the electroenzymatic oxidation of glucose at low potential using a hierarchically structured electrode based on MgO-templated carbon. The modified electrode was prepared by assembling glucose oxidase (GOx) with an osmiumbased redox polymer with a low formal potential (-0.03 V vs. Ag|AgCl), in which Os complexes are tethered to the polymer backbone via a 13-atom alkyl chain and a crosslinker. A glucose oxidation current density of 15 mA cm-2 was measured at 0 V vs. Ag|AgCl at 37 °C and pH 7, with a plateau value of 50 mA cm-2 at 0.3 V. The hydrogel electrodes composed of the same redox polymer and FAD-dependent glucose dehydrogenase delivered only 10% of the current densities obtained with the GOx electrode.

Mots clés: Glucose oxidase; Redox hydrogel; Porous carbon; Biofuel cell

Domaines: Matériaux; Catalyse

Aimi Suzuki, Nicolas Mano, Seiya Tsujimura. Lowering the potential of electroenzymatic glucose oxidation on redox hydrogel-modified porous carbon electrode. Electrochimica Acta, 2017, 232, pp. 581-585. ⟨10.1016/j.electacta.2017.03.007⟩. ⟨hal-01512668⟩