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A New Conducting Copolymer Bearing Electro‐Active Nitroxide Groups as Organic Electrode Materials for Batteries
Author(s) -
Assumma L.,
Kervella Y.,
Mouesca J.M.,
Mendez M.,
Maurel V.,
Dubois L.,
Gutel T.,
Sadki S.
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201903313
Subject(s) - nitroxide mediated radical polymerization , electron paramagnetic resonance , copolymer , redox , carbazole , radical , electrochemistry , polymer chemistry , polymer , chemistry , materials science , electrode , conductive polymer , photochemistry , radical polymerization , organic chemistry , nuclear magnetic resonance , physics
To reduce the amount of conducting additives generally required for polynitroxide‐based electrodes, a stable radical (TEMPO) is combined with a conductive copolymer backbone consisting of 2,7‐bisthiophene carbazole (2,7‐BTC), which is characterized by a high intrinsic electronic conductivity. This work deals with the synthesis of this new polymer functionalized by a redox nitroxide. Fine structural characterization using electron paramagnetic resonance (EPR) techniques established that: 1) the nitroxide radicals are properly attached to the radical chain (continuous wave EPR) and 2) the polymer chain has very rigid conformations leading to a set of well‐defined distances between first neighboring pairs of nitroxides (pulsed EPR). The redox group combined with the electroactive polymer showed not only a very high electrochemical reversibility but also a perfect match of redox potentials between the de‐/doping reaction of the bisthiophene carbazole backbone and the redox activity of the nitroxide radical. This new organic electrode shows a stable capacity (about 60 mAh g −1 ) and enables a strong reduction in the amount of carbon additive due to the conducting‐polymer skeleton.