Comparison of Quinone‐Based Catholytes for Aqueous Redox Flow Batteries and Demonstration of Long‐Term Stability with Tetrasubstituted Quinones
- Department of Chemistry University of Wisconsin–Madison 1101 University Avenue Madison WI 53706‐1322 USA
- Department of Chemical and Biological Engineering University of Wisconsin–Madison 1415 Engineering Drive Madison WI 53706 USA
- Electrosynthesis Company, Inc 72 Ward Road Lancaster NY 14086 USA
- Department of Chemical and Biological Engineering Iowa State University 2114 Sweeney Hall, 618 Bissell Road Ames IA 50011‐2230 USA
Abstract
Quinones are appealing targets as organic charge carriers for aqueous redox flow batteries (RFBs), but their utility continues to be constrained by limited stability under operating conditions. The present study evaluates the stability of a series of water‐soluble quinones, with redox potentials ranging from 605–885 mV versus NHE, under acidic aqueous conditions (1 m H 2 SO 4 ). Four of the quinones are examined as cathodic electrolytes in an aqueous RFB, paired with anthraquinone‐2,7‐disulfonate as the anodic electrolyte. The RFB data complement other solution stability tests and show that the most stable electrolyte is a tetrasubstituted quinone containing four sulfonated thioether substituents. The results highlight the importance of substituting all C–H positions of the quinone in order to maximize the quinone stability and set the stage for design of improved organic electrolytes for aqueous RFBs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1615062
- Alternate ID(s):
- OSTI ID: 1706729
- Journal Information:
- Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 20 Vol. 10; ISSN 1614-6832
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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