Pseudocapacitive Redox Polymers as Battery Materials: A Proof-of-Concept All-Polymer Aqueous Battery

Dieckhöfer, S. and Medina, D. and Ruff, A. and Conzuelo, F. and Schuhmann, W.

Volume: 8 Pages: 2308-2314
DOI: 10.1002/celc.202100450
Published: 2021

Redox polymers with distinct redox units have been long recognized for their pseudocapacitive and reversible charge storage behaviour. Many systems investigated so far have utilized organic electrolytes and/or have coupled a redox polymer half-cell to a non-polymer counter electrode. However, due to safety and sustainability considerations, aqueous electrolyte based charge storage in all-polymer configurations is considered a promising option for possible future applications. We present a strategy based on pseudocapacitive charge storage in Osmium-complex and viologen-modified redox polymers with specifically designed poly(vinylimidazole)- and poly(vinylpyridine)-based backbones. We couple both redox polymers in an aqueous battery configuration, demonstrating Nernst-potential driven energy storage. Electrochemical characterization in a concentric three-electrode Swagelok cell and coin cells reveals stable reversible capacities over more than 1800 cycles, with nearly quantitative coulombic efficiencies (>99.4 %) for the coin cells. © 2021 The Authors. ChemElectroChem published by Wiley-VCH GmbH

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