Publications

An Air-breathing Carbon Cloth-based Screen-printed Electrode for Applications in Enzymatic Biofuel Cells

Marković, N. and Conzuelo, F. and Szczesny, J. and González García, M.B. and Hernández Santos, D. and Ruff, A. and Schuhmann, W.

ELECTROANALYSIS
Volume: Pages:
DOI: 10.1002/elan.201800462
Published: 2018

Abstract
We report a prototype air-breathing carbon cloth-based electrode that was fabricated starting from a commercially available screen-printed electrode equipped with a transparent ITO working electrode (DropSens, ref. ITO10). The fabrication of the air-breathing electrodes is straightforward, shows satisfactory reproducibility and a good electrochemical response as evaluated by means of [Fe(CN)6]3−/4− voltammetry. The gas-diffusion electrodes were successfully modified with the O2 reducing enzyme bilirubin oxidase from Myrothecium verrucaria in a direct electron transfer regime. The enzyme modified electrodes showed a remarkable high current density for O2 reduction in passive air-breathing mode of up to 5 mA cm−2. Moreover, the enzyme modified electrodes were applied as O2 reducing biocathodes in a glucose/air enzymatic biofuel cell in combination with a high current density glucose oxidase/redox polymer bioanode. The biofuel cell provides a high maximum power density of (0.34±0.02) mW cm−2 at 0.25 V. The straightforward design, low cost and the high reproducibility of these electrodes are considered as basis for standardized measurements under gas-breathing conditions and for high throughput screening of gas converting (bio-)catalysts. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

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