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Molecular Engineering Strategies for Symmetric Aqueous Organic Redox Flow Batteries

preprint
submitted on 12.11.2019 and posted on 20.11.2019 by Rocco Peter Fornari, Murat Mesta, Johan Hjelm, Tejs Vegge, Piotr de Silva

Symmetric aqueous organic redox flow batteries (RFBs) are potentially a cheap, durable and safe energy storage technology. Unlike normal asymmetric flow batteries, they are based on electrolytes that exist in at least three oxidation states and can undergo a minimum of two distinct redox processes. We compute the redox potentials of selected electrolytes intending to understand how the interaction between the redox units affects the potentials. We find that electronic interaction between redox units and intramolecular hydrogen bonding can both be exploited to tune the difference between the redox potentials, i.e. the theoretical voltage of the battery. The redox potentials can be further fine-tuned in either direction by adding substituents. Starting from these observations we formulate a set of rules which will help finding ideal candidates for symmetric RFBs.

Funding

Innovation Fund Denmark

History

Email Address of Submitting Author

pdes@dtu.dk

Institution

Technical University of Denmark

Country

Denmark

ORCID For Submitting Author

0000-0002-4985-7350

Declaration of Conflict of Interest

No conflict of interest

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