Electroactivity of PIPO Nitroxide Radical Polymer Films

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Abstract

Nitroxide radical polymers (NRPs) are widely used as electroactive materials in a range of electrochemical applications, however, their preparation can be complex. Polyamine Immobilised Piperidinyl Oxyl (PIPO) is a commercially available, well-defined, NRP whose electrochemical properties have not been explored to date. Cyclic voltammetric (CV) studies demonstrate the electroactivity of PIPO in a range of organic electrolytes, displaying quasi-reversible redox waves, characteristic of a nitroxide radical / oxoammonium couple, with midpoint potentials in the range of 0.2 to 0.3 V vs. Fc+ / Fc. When immobilised at a graphite electrode surface, PIPO maintains its electroactivity, forming stable, swellable films in acetonitrile-based electrolyte. Voltammetric and potentiometric analyses indicate that films can undergo repeated charge / discharge cycling, possibly facilitated by a diffusional controlled ‘electron hopping’ process. Furthermore, CV studies indicate that PIPO is an effective surface confined electrocatalyst for oxidation reactions of relevance to organic electrosynthesis and to lithium-air battery development. Such insights establish the basis for further investigations of PIPO as an accessible, cost-effective, and adaptable electroactive material for electrocatalytic and energy storage applications.
Original languageEnglish
JournalElectrochimica Acta
Early online date06 Aug 2021
DOIs
Publication statusEarly online date - 06 Aug 2021

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