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Phosphoryl- and Phosphonium-Bridged Viologens as Stable Two- and Three-Electron Acceptors for Organic Electrodes

preprint
submitted on 24.07.2020 and posted on 27.07.2020 by Colin R. Bridges, Andryj M. Borys, Vanessa Béland, Joshua R. Gaffen, Thomas Baumgartner
Low molecular weight organic molecules that can accept multiple electrons at high
reduction potentials are sought after as electrode materials for high-energy sustainable batteries. To date their synthesis has been difficult, and organic scaffolds for electron donors significantly outnumber electron acceptors. Herein, we report two highly electron deficient phosphaviologen derivatives from a phosphorus-bridged 4,4-bipyridine and characterize their electrochemical properties. Phosphaviologen sulfide (PVS) and P-methyl phosphaviologen (PVM) accept two and three electrons at high reduction potentials, respectively. PVM can reversibly accept 3 electrons between 3-3.6 V vs. Li/Li+ with an equivalent molecular weight of 102 g/(mol e-) (262 mAh/g), making it a promising scaffold for sustainable organic electrode materials having high specific energy densities.

History

Email Address of Submitting Author

tbaumgar@yorku.ca

Institution

York University

Country

Canada

ORCID For Submitting Author

0000-0001-8066-0559

Declaration of Conflict of Interest

no conflict

Exports