Shifting redox potential of nitroxyl radical by introducing an imidazolium substituent and its use in aqueous flow batteries

Title
Shifting redox potential of nitroxyl radical by introducing an imidazolium substituent and its use in aqueous flow batteries
Authors
헨켄스마이어디억Zhenjun ChangRuiyong Chen
Keywords
Redox flow battery; Energy storage; 4-hydroxy-TEMPO; Redox-active organic molecule; Imidazolium grafting
Issue Date
2019-04
Publisher
Journal of power sources
Citation
VOL 418-16
Abstract
Imidazolium-grafted nitroxyl radical is synthesized through a simple two-step reaction route, and studied as redox-active catholyte for redox flow batteries. A discharge cell voltage of 1.64  V against a Zn2+/Zn anodic couple in aqueous electrolyte has been achieved. Compared to the commercial 4-OH-TEMPO and previous work, the excellent chemical and electrochemical stability of the newly synthesized compound has been confirmed from the enhanced and steady Coulombic efficiency over charge/discharge cycling. Moreover, stable cycling efficiencies and good capacity retention over long-term cycling have been observed.
URI
http://pubs.kist.re.kr/handle/201004/69071
ISSN
0378-7753
Appears in Collections:
KIST Publication > Article
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