期刊
NPG ASIA MATERIALS
卷 9, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/am.2016.195
关键词
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资金
- European Regional Development Fund (EFRE)
- Thuringian Ministry for Economic Affairs, Science and Digital Society (TMWWdG)
- Zentrales Innovationsprogramm Mittelstand (ZIM)
- Fonds der Chemischen Industrie (FCI)
An all-organic symmetric redox-flow battery (RFB) that employs nitronyl nitroxide (NN) units as a bipolar redox-active chargestorage material was designed and investigated. An organic molecule possessing two bipolar redox-active NN units connected via a tetraethylene glycol chain was synthesized for this purpose. Owing to the ethylene glycol chain, this molecule demonstrates good solubility in organic solvents. The electrochemical behavior of the obtained compound was investigated via cyclic voltammetry (CV) measurements and it features quasi-reversible redox reactions of the NN+/NN redox couple at E-1/2 = 0.37 V and the NN/NN(-)redox couple at E-1/2 =-1.25 V versus AgNO3/Ag, which led to a promising cell voltage of 1.62 V in a subsequent battery application. A static solution- based battery exhibits a stable charge/discharge performance over 75 consecutive cycles with a high energy efficiency of 82% and an overall energy density of the electrolyte system of 0.67 W h l(-1). In addition, a pumped RFB test demonstrates an overall energy density of the electrolyte system of 4.1 W h l(-1) and an energy efficiency of 79%.
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