Effect of the Linker in Terephthalate-Functionalized Conducting Redox Polymers
(English)Manuscript (preprint) (Other academic)
The combination of high capacity redox active pendent groups and conducting polymers, realized in conducting redox polymers (CRPs), provides materials with high charge storage capacity that are electronically conducting whichmakes CRPs attractive for electrical energy storage applications. In this report, six polythiophene and poly(3,4-ethylenedioxythiophene)(PEDOT)-based CRPs with a diethyl terephthalate unit covalently bound to the polymer chain byvarious linkers have been synthesized and characterized electrochemically. The effects of the choice of polymer backboneand of the nature of the link on the electrochemistry, and in particular the cycling stability of these polymers, are discussed.All CRPs show both the doping of the polymer backbone as well as the redox behavior of the pendent groups and the redoxpotential of the pendent groups in the CRPs is close to that of corresponding monomer, indicating insignificant interactionbetween the pendant and the polymer backbone. While all CRPs show various degrees of charge decay upon electrochemical redox conversion, the PEDOT-based CRPs show significantly improved stability compared to the polythiophene counterparts. Moreover, we show that by the right choice of link the cycling stability of diethyl terephthalate substituted PEDOTbased CRPS can be significantly improved.
conducting redox polymers, PEDOT, polythiophene, terephthalate
IdentifiersURN: urn:nbn:se:uu:diva-304623OAI: oai:DiVA.org:uu-304623DiVA: diva2:1033250