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A Zn−Ce Redox Flow Battery with Ethaline Deep Eutectic Solvent
Author(s) -
Cao Xiaozhou,
Wang Song,
Xue Xiangxin
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202100077
Subject(s) - deep eutectic solvent , electrolyte , choline chloride , redox , flow battery , cyclic voltammetry , faraday efficiency , chemistry , electrochemistry , inorganic chemistry , ionic liquid , battery (electricity) , ethylene glycol , eutectic system , cerium , electrode , organic chemistry , catalysis , quantum mechanics , power (physics) , physics , alloy
Compared with conventional aqueous and ionic liquid electrolytes, deep eutectic solvent (DES) are considered as electrolyte for redox flow batteries because they have a wider electrochemical window and relatively low price. In this study, Ce IV /Ce III and Zn II /Zn redox couples are used as the positive and negative active materials, respectively, in an electrolyte consisting of choline chloride ethylene glycol (ethaline). The structure of Ce III in the positive electrolyte is inferred through spectrum detection. Ce IV /Ce III and Zn II /Zn redox couples show a stable potential difference of 2.2 V (vs. Ag) through cyclic voltammetry. The charge and discharge performance of battery was tested at different current densities. In addition, battery performance was evaluated at different temperatures and concentrations of cerium in the electrolyte. Consequently, at a current density of 0.5 mA cm −2 at room temperature and using 1.0 m Ce III , the battery performance reaches the best coulombic efficiency of 84 %.