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

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 osmium-ba...

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Bibliographic Details
Published in:Electrochimica acta 2017-04, Vol.232, p.581-585
Main Authors: Suzuki, Aimi, Mano, Nicolas, Tsujimura, Seiya
Format: Article
Language:English
Subjects:
biofuel cell
Catalysis
Chains (polymeric)
Chemical Sciences
Crosslinking
Current density
Density
Electric currents
Electrodes
Glucose oxidase
High current
Magnesium oxide
Material chemistry
Osmium
Oxidation
porous carbon
redox hydrogel
Studies
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Summary: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 osmium-based redox polymer with a low formal potential (−0.03V 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 15mAcm−2 was measured at 0V vs. Ag|AgCl at 37°C and pH 7, with a plateau value of 50mAcm−2 at 0.3V. 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.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2017.03.007