Electrochemical and Transport Characteristics of V(II)/V(III) Redox Couple in a Nonaqueous Deep Eutectic Solvent: Temperature Effect
Publication: Journal of Energy Engineering
Volume 143, Issue 5
Abstract
Compared with conventional aqueous electrolytes, deep eutectic solvents (DES) have been used as the electrolytes of flow batteries for their unique merits, including a wide electrochemical window, ease in preparation, and low vapor pressure. However, the electrochemical and physical characteristics of DES are sensitive to the change of temperature, and there are few related studies. An urgent need exists for research into temperature adaptability of flow batteries with DES electrolytes before they can be utilized practically. This paper studies the electrochemical and transport characteristics of vanadium ions in a DES by varying the operating temperatures. The cyclic voltammetry curves indicate that vanadium ions show a quasi-reversible redox reaction in DES. With the rise of temperature from ambient temperature to 55°C, the gap between oxidation and reduction peaks decreases from 0.271 to 0.248 V at a scan rate of . Both the oxidation and the reduction peak current densities of V(II)/V(III) have a similar incremental trend. Conductivity increases from at ambient temperature to at 55°C, whereas the viscosity of DES with vanadium ions decreases sharply. The results prove that operating temperature has a vital effect on the electrochemical reaction and transport characteristics of V(II)/V(III) redox couple in DES, and it deserves further study in cell performance.
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Acknowledgments
The work described in this paper was fully supported by grants from the NSFC, China (Project Nos. 51306076, 21506081, and 51676092), a grant from the Chinese Postdoctoral Foundation (Project No. 2015M571685) and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Published In
Journal of Energy Engineering
Volume 143 • Issue 5 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Sep 29, 2016
Accepted: May 1, 2017
Published online: Jul 17, 2017
Published in print: Oct 1, 2017
Discussion open until: Dec 17, 2017
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