ArticleChemical science2026
Rationalizing (in)stability of pyridinium ketones in aqueous organic flow batteries.
Article in Chemical science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Rationalizing the stability of organic molecules for aqueous flow battery applications is crucial for development of sustainable large scale energy storage technologies. Herein, the properties of two molecules featuring a pyridinium group next to a ketone either as an open structure (benzoylpyridinium) or as a fused ring structure (azoniafluorenone) were compared. The electrochemical investigations and flow battery experiments reveal that benzoylpyridinium electrolytes show very poor to poor stability depending on the pH while azoniafluorenones show good stability in neutral pH and poor stability in alkaline pH. The root of the problem appears to lie in the irreversible protonation of the benzylic position that takes place as the last step of the redox cycle of benzoylpyridinium electrolytes. The benzylic C-H proton of the doubly reduced molecule is readily protonated with a p
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