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Substituent Pattern Effects on the Redox Potentials of Quinone‐Based Active Materials for Aqueous Redox Flow Batteries
Author(s) -
Schwan S.,
Schröder D.,
Wegner H. A.,
Janek J.,
Mollenhauer D.
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.202000454
Subject(s) - redox , substituent , chemistry , quinone , intramolecular force , steric effects , photochemistry , aqueous solution , benzoquinone , combinatorial chemistry , computational chemistry , organic chemistry
Quinone‐based, aqueous redox flow batteries are a promising technology for large‐scale, low‐cost energy storage. To understand the influence of substituent and substituent pattern effects of quinone‐based derivatives on the redox potential, a screening study was performed that included benzoquinone, naphtaquinone, and anthraquinone derivatives. The order of substituent influence is −OH>−Me/−OMe for decreasing the redox potential and −F<−SO 3 − <−CN, −NO 2 for increasing the redox potential, which is in agreement with general expectations. We found that the consideration of resonance and inductive effects design strategies of redox‐active materials can be extended by the ability of intramolecular hydrogen bond formation, steric hindrance, and energetic differences of conformers for oxidized and reduced species. Due to the complexity and overlap of these effects, theoretical screening studies can provide guidance for the design of new molecular materials. In addition to the redox potential, other parameters such as stability, solubility, and kinetic rate constant or synthetic accessibility are crucial to consider.