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@ARTICLE{Korshunov:1019527,
author = {Korshunov, Aleksandr and Milner, Matthew James and
Grünebaum, Mariano and Studer, Armido and Winter, Martin
and Cekic-Laskovic, Isidora},
title = {{A}n oxo-verdazyl radical for a symmetrical nonaqueous
redox flow battery},
journal = {Journal of materials chemistry / A},
volume = {8},
issn = {2050-7488},
address = {London [u.a.]},
publisher = {RSC},
reportid = {FZJ-2023-05474},
pages = {22280–22291},
year = {2020},
abstract = {Verdazyl free radical compounds are promising candidates
for symmetrical all-organic redox flow batteries(RFBs) due
to their redox stability, the ease with which their chemical
structure can be varied, and theirunique bipolar nature. The
present work reports a preliminary screening of a selection
of oxo-verdazylcompounds for key redox electrolyte
parameters. Of the considered candidates, the
1,5-diphenyl-3-isopropyl-6-oxo-verdazyl radical performed
best and is investigated in extensive RFB experiments
tocompare its electrochemical behavior in cyclic voltammetry
(CV) to that within an actual battery. Thesymmetrical
oxo-verdazyl non-aqueous electrolyte RFB provides a mean
voltage of 1.42 V anddemonstrates good stability as well as
high coulombic $(>97\%)$ and energy efficiencies over more
than100 charge/discharge cycles. The redox electrolyte is
characterized at different stages within a singlecycle
(‘state of charge’ experiments) independently for each
half-cell. To address the specifics of theelectrolyte
transition to RFB cell setup an ‘in-cell’ CV
flow-enabled electrochemical study has beenconducted,
introduced here as a new step towards standardization of the
electrochemical description ofRFB electrolytes. The
electrochemical performance results highlight oxo-verdazyls
as versatile materialsfor energy applications and indicate
great promise for their further development and optimization
in thefield of RFBs.},
cin = {IEK-12},
ddc = {530},
cid = {I:(DE-Juel1)IEK-12-20141217},
pnm = {1221 - Fundamentals and Materials (POF4-122) / SFB 858 B11
- Kooperativität in organischen spintragenden Materialien
und ihren Hybridsystemen: Steuerung magnetischer
Eigenschaften durch Orientierung von Radikalen (B11)
(159705466)},
pid = {G:(DE-HGF)POF4-1221 / G:(GEPRIS)159705466},
typ = {PUB:(DE-HGF)16},
url = {https://juser.fz-juelich.de/record/1019527},
}