An oxo-verdazyl radical for a symmetrical non-aqueous redox flow battery

被引:38
|
作者
Korshunov, Aleksandr [1 ]
Milner, Matthew James [2 ]
Gruenebaum, Mariano [3 ]
Studer, Armido [2 ]
Winter, Martin [1 ,3 ]
Cekic-Laskovic, Isidora [3 ]
机构
[1] Univ Munster, MEET Battery Res Ctr, D-48149 Munster, Germany
[2] Westfalische Wilhelms Univ, Organ Chem Inst, Corrensstr 40, D-48149 Munster, Germany
[3] Forschungszentrum Julich, IEK 12, Helmholtz Inst Munster, D-48149 Munster, Germany
关键词
ENERGY-STORAGE; LITHIUM ION; ELECTRODE; DESIGN; STRATEGIES; MEMBRANES;
D O I
10.1039/d0ta07891c
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 their unique bipolar nature. The present work reports a preliminary screening of a selection of oxo-verdazyl compounds 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 to compare its electrochemical behavior in cyclic voltammetry (CV) to that within an actual battery. The symmetrical oxo-verdazyl non-aqueous electrolyte RFB provides a mean voltage of 1.42 V and demonstrates good stability as well as high coulombic (>97%) and energy efficiencies over more than 100 charge/discharge cycles. The redox electrolyte is characterized at different stages within a single cycle ('state of charge' experiments) independently for each half-cell. To address the specifics of the electrolyte transition to RFB cell setup an 'in-cell' CV flow-enabled electrochemical study has been conducted, introduced here as a new step towards standardization of the electrochemical description of RFB electrolytes. The electrochemical performance results highlight oxo-verdazyls as versatile materials for energy applications and indicate great promise for their further development and optimization in the field of RFBs.
引用
收藏
页码:22280 / 22291
页数:12
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