A gas breathing hydrogen/air biofuel cell comprising a redox polymer/hydrogenase-based bioanode

Julian Szczesny, Nikola Marković, Felipe Conzuelo, Sónia Zacarias, Inês A. C. Pereira, Wolfgang Lubitz, Nicolas Plumeré, Wolfgang Schuhmann () and Adrian Ruff ()
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Julian Szczesny: Ruhr-Universität Bochum
Nikola Marković: Ruhr-Universität Bochum
Felipe Conzuelo: Ruhr-Universität Bochum
Sónia Zacarias: Universidade Nova de Lisboa
Inês A. C. Pereira: Universidade Nova de Lisboa
Wolfgang Lubitz: Max-Planck-Institut für Chemische Energiekonversion
Nicolas Plumeré: Ruhr-Universität Bochum
Wolfgang Schuhmann: Ruhr-Universität Bochum
Adrian Ruff: Ruhr-Universität Bochum

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Hydrogen is one of the most promising alternatives for fossil fuels. However, the power output of hydrogen/oxygen fuel cells is often restricted by mass transport limitations of the substrate. Here, we present a dual-gas breathing H2/air biofuel cell that overcomes these limitations. The cell is equipped with a hydrogen-oxidizing redox polymer/hydrogenase gas-breathing bioanode and an oxygen-reducing bilirubin oxidase gas-breathing biocathode (operated in a direct electron transfer regime). The bioanode consists of a two layer system with a redox polymer-based adhesion layer and an active, redox polymer/hydrogenase top layer. The redox polymers protect the biocatalyst from high potentials and oxygen damage. The bioanodes show remarkable current densities of up to 8 mA cm-2. A maximum power density of 3.6 mW cm-2 at 0.7 V and an open circuit voltage of up to 1.13 V were achieved in biofuel cell tests, representing outstanding values for a device that is based on a redox polymer-based hydrogenase bioanode.

Date: 2018
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DOI: 10.1038/s41467-018-07137-6

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