Mediated biocatalytic cathodes operating on gas-phase air and oxygen in fuel cells

Nicholas S. Hudak, Joshua W. Gallaway, Scott Calabrese Barton

    Research output: Contribution to journalArticle

    • 21 Citations

    Abstract

    A biocatalytic fuel cell cathode operating with gas-phase air or oxygen is demonstrated. The cathode consisted of the oxygen-reducing enzyme laccase from Trametes versicolor and an osmium-based redox polymer mediator. These components were deposited with a small amount of citrate buffer solution onto a porous carbon-fiber support. The biocathode was combined with a Nafion electrolyte membrane and a conventional platinum anode to form a membrane-electrode assembly. The electrode reached current densities of 1 mA cm2 at 0.8 V (vs reference hydrogen electrode) when exposed to humidified oxygen or air but was unstable because of water loss from the cathode. Flow rate, humidification, and oxygen concentration of the cathode gas stream had a strong effect on stability but not on maximum current density. Cyclic voltammetry and electrochemical impedance experiments revealed that ionic conductivity in the cathode decreased as water was lost.

    Original languageEnglish (US)
    JournalJournal of the Electrochemical Society
    Volume156
    Issue number1
    DOIs
    StatePublished - 2009

    Profile

    cathodes
    oxygen
    Cathodes
    Coumestrol
    Oxygen
    electrodes
    air
    Electrodes
    Air
    Gases
    Amoxapine
    Autoradiography
    fuel cells
    vapor phases
    current density
    membranes
    Fuel cells
    Current density
    Membranes
    Water

    ASJC Scopus subject areas

    • Electrochemistry
    • Electronic, Optical and Magnetic Materials
    • Materials Chemistry
    • Surfaces, Coatings and Films
    • Renewable Energy, Sustainability and the Environment
    • Condensed Matter Physics

    Cite this

    Mediated biocatalytic cathodes operating on gas-phase air and oxygen in fuel cells. / Hudak, Nicholas S.; Gallaway, Joshua W.; Calabrese Barton, Scott.

    In: Journal of the Electrochemical Society, Vol. 156, No. 1, 2009.

    Research output: Contribution to journalArticle

    Hudak, Nicholas S.; Gallaway, Joshua W.; Calabrese Barton, Scott / Mediated biocatalytic cathodes operating on gas-phase air and oxygen in fuel cells.

    In: Journal of the Electrochemical Society, Vol. 156, No. 1, 2009.

    Research output: Contribution to journalArticle

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