Journal
ELECTROANALYSIS
Volume 31, Issue 2, Pages 217-221Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201800462
Keywords
Gas-breathing electrodes; enzymatic biofuel cells; screen-printed electrodes; carbon cloth; redox polymers
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Funding
- Cluster of Excellence RESOLV - Deutsche Forschungsgemeinschaft (DFG) [EXC 1069]
- European Commission [PITN-GA-2013-607793]
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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 O-2 reducing enzyme bilirubin oxidase from Myrothecium verrucaria in a direct electron transfer regime. The enzyme modified electrodes showed a remarkable high current density for O-2 reduction in passive air-breathing mode of up to 5mAcm(-2). Moreover, the enzyme modified electrodes were applied as O-2 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)mWcm(-2) at 0.25V. 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.
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