Redox-Polymer-Based High-Current-Density Gas-Diffusion H2-Oxidation Bioanode Using [FeFe] Hydrogenase from Desulfovibrio desulfuricans in a Membrane-free Biofuel Cell

Szczesny, J. and Birrell, J.A. and Conzuelo, F. and Lubitz, W. and Ruff, A. and Schuhmann, W.

Volume: 59 Pages: 16506-16510
DOI: 10.1002/anie.202006824
Published: 2020

The incorporation of highly active but also highly sensitive catalysts (e.g. the [FeFe] hydrogenase from Desulfovibrio desulfuricans) in biofuel cells is still one of the major challenges in sustainable energy conversion. We report the fabrication of a dual-gas diffusion electrode H2/O2 biofuel cell equipped with a [FeFe] hydrogenase/redox polymer-based high-current-density H2-oxidation bioanode. The bioanodes show benchmark current densities of around 14 mA cm−2 and the corresponding fuel cell tests exhibit a benchmark for a hydrogenase/redox polymer-based biofuel cell with outstanding power densities of 5.4 mW cm−2 at 0.7 V cell voltage. Furthermore, the highly sensitive [FeFe] hydrogenase is protected against oxygen damage by the redox polymer and can function under 5 % O2. © 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA

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