Effect of Molecular Structure and Coordinating Ions on the Solubility and Electrochemical Behavior of Quinone Derivatives for Aqueous Redox Flow Batteries

Title
Effect of Molecular Structure and Coordinating Ions on the Solubility and Electrochemical Behavior of Quinone Derivatives for Aqueous Redox Flow Batteries
Authors
헨켄스마이어디억김상원Zhifeng HuangJongwook LeeRolf HempelmannRuiyong Chen
Keywords
flow battery; membrane; quinones; ionic liquids; energy storage
Issue Date
2020-12
Publisher
Journal of the Electrochemical Society
Citation
VOL 167, NO 16, 160502
Abstract
Water soluble organic redox-species have been studied in redox flow batteries as promising alternatives to overcome the limitation of current vanadium chemistry such as low energy density and high cost. Herein, a comparative physicochemical and electrochemical study of several structurally similar quinones in different molalities of imidazolium-based aqueous electrolytes highlights the importance of the molecular structure of organic solutes and their coordination with the imidazolium cations in electrolytes. A quinone derivative of 2-methoxyl-hydroquinone with a record solubility of 7.9 M at room temperature is obtained in the aqueous imidazolium-based supporting electrolyte. This is close to a maximum value of 8.13 M in its molten state, suggesting a new approach to dissolving organic-active materials. In addition, strong coordination imposes a significant effect on the chemical/electrochemical stability and redox potential of the organic quinones. The reaction kinetics and cycling performance of the 2-methoxyl-hydroquinone as catholyte in a redox flow battery have been investigated by pairing it with a vanadium anolyte (V3+/V2+ redox pair), showing a high cycling efficiency and structural stability
URI
http://pubs.kist.re.kr/handle/201004/72487
ISSN
0013-4651
Appears in Collections:
KIST Publication > Article
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