An Oxidizable Anion‐Excluding Polymer‐Overlayer for Oxygen Electrodes |
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Authors: | Chan Kang Sangeun Cho Hyosul Shin Adam Heller |
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Affiliation: | 1. Department of Chemistry, Research Institute of Physics and Chemistry Chonbuk National University, Jeonju, Jeonbuk 561‐756, South Korea;2. Department of Chemical Engineering, University of Texas, Austin TX 78712, USA |
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Abstract: | Here we describe an anion excluding ion‐permeable membrane, which we evaluate on an O2‐electroreducing cathode poised at a strongly oxidizing potential, near the reversible potential of the O2/H2O half cell. The bioelectrocatalyst of the O2 cathode consists of the cross‐linked electrostatic adduct of a polycationic redox hydrogel and bilirubin oxidase (BOD), a polyanion at neutral at pH 7.3. If an uncured Nafion dispersion is applied on this bioelectrocatalyst, the polyanionic Nafion displaces the BOD in the electrostatic adduct, de‐wiring the BOD. We show here that insertion of a polycationic poly(acrylamide‐co‐vinylimidazole) (PAA‐PVI) between the bioelectrocatalyst and the Nafion prevents the dewiring of BOD. The resulting bi‐layer membrane effectively excludes the urate, thiocyanate and NADH anions. |
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Keywords: | Membrane Electrode Oxygen Anion Enzyme Hydrogel |
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