Premium
An Oxidizable Anion‐Excluding Polymer‐Overlayer for Oxygen Electrodes
Author(s) -
Kang Chan,
Cho Sangeun,
Shin Hyosul,
Heller Adam
Publication year - 2009
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200900310
Subject(s) - nafion , oxidizing agent , chemistry , adduct , membrane , ion exchange , cathode , thiocyanate , inorganic chemistry , polymer , redox , electrode , ion , polymer chemistry , electrochemistry , organic chemistry , biochemistry
Here we describe an anion excluding ion‐permeable membrane, which we evaluate on an O 2 ‐electroreducing cathode poised at a strongly oxidizing potential, near the reversible potential of the O 2 /H 2 O half cell. The bioelectrocatalyst of the O 2 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.