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

Authors
Chang, ZhenjunHenkensmeier, DirkChen, Ruiyong
Issue Date
2019-04
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v.418, pp.11 - 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.
Keywords
IONIC LIQUID; HIGH-CAPACITY; HIGH-VOLTAGE; ELECTROLYTES; EFFICIENT; DENSITY; SURFACE; POINT; PH; Redox flow battery; Energy storage; 4-hydroxy-TEMPO; Redox-active organic molecule; Imidazolium grafting
ISSN
0378-7753
URI
https://pubs.kist.re.kr/handle/201004/120151
DOI
10.1016/j.jpowsour.2019.02.028
Appears in Collections:
KIST Article > 2019
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