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Title: Near Neutral pH Redox Flow Battery with Low Permeability and Long-Lifetime Phosphonated Viologen Active Species

Journal Article · · Advanced Energy Materials

A highly stable phosphonate-functionalized viologen is introduced in this work as the redox-active material in a negative potential electrolyte for aqueous redox flow batteries (ARFBs) operating at nearly neutral pH. The solubility is 1.23 m and the reduction potential is the lowest of any substituted viologen utilized in a flow battery, reaching –0.462 V versus SHE at pH = 9. The negative charges in both the oxidized and the reduced states of 1,1'-bis(3-phosphonopropyl)-[4,4'-bipyridine]-1,1'-diium dibromide (BPP–Vi ) effect low permeability in cation exchange membranes and suppress a bimolecular mechanism of viologen decomposition. A flow battery pairing BPP–Vi with a ferrocyanide-based positive potential electrolyte across an inexpensive, non-fluorinated cation exchange membrane at pH = 9 exhibits an open-circuit voltage of 0.9 V and a capacity fade rate of 0.016% per day or 0.00069% per cycle. Overcharging leads to viologen decomposition, causing irreversible capacity fade. Our research introduces extremely stable, extremely low-permeating and low reduction potential redox active materials into near neutral ARFBs.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Harvard Univ., Cambridge, MA (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF)
Contributing Organization:
Massachusetts Clean Energy Center
Grant/Contract Number:
AC05-76RL01830; CBET‐1914543; 428977
OSTI ID:
1608418
Alternate ID(s):
OSTI ID: 1608377
Journal Information:
Advanced Energy Materials, Vol. 10, Issue 20; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 98 works
Citation information provided by
Web of Science

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