Redox Capacitor to Establish Bio-Device Redox-Connectivity

Authors

  • Eunkyoung Kim,

    1. Institute for Bioscience and Biotechnology Research and Fischell Department of Bioengineering, 5115 Plant Sciences Buildin, University of Maryland, College Park, MD 20742, USA
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  • Yi Liu,

    1. Institute for Bioscience and Biotechnology Research and Fischell Department of Bioengineering, 5115 Plant Sciences Buildin, University of Maryland, College Park, MD 20742, USA
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  • William E. Bentley,

    1. Institute for Bioscience and Biotechnology Research and Fischell Department of Bioengineering, 5115 Plant Sciences Buildin, University of Maryland, College Park, MD 20742, USA
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  • Gregory F. Payne

    Corresponding author
    1. Institute for Bioscience and Biotechnology Research and Fischell Department of Bioengineering, 5115 Plant Sciences Buildin, University of Maryland, College Park, MD 20742, USA
    • Institute for Bioscience and Biotechnology Research and Fischell Department of Bioengineering, 5115 Plant Sciences Buildin, University of Maryland, College Park, MD 20742, USA.
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Abstract

Electronic devices process information and transduce energy with electrons, while biology performs such operations with ions and chemicals. To establish bio-device connectivity, we fabricate a redox-capacitor film from a polysaccharide (i.e., chitosan) and a redox-active catechol. We report that these films are rapidly and repeatedly charged and discharged electrochemically via a redox-cycling mechanism in which mediators shuttle electrons between the electrode and film (capacitance ≈ 40 F/g or 2.9 mF/cm2). Further, charging and discharging can be executed under bio-relevant conditions. Enzymatic-charging is achieved by electron-transfer from glucose to the film via an NADPH-mediated redox-cycling mechanism. Discharging occurs by electron-donation to O2 to generate H2O2 that serves as substrate for peroxidase-mediated biochemical reactions. Thus, these films offer the capability of inter-converting electrochemical and biochemical inputs/outputs. Among potential applications, we anticipate that catechol–chitosan redox-capacitor films could serve as circuit elements for molecular logic operations or for transducing bio-based chemical energy into electricity.

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