Systematic Investigation of the Physical and Electrochemical Characteristics of the Vanadium (III) Acidic Electrolyte With Different Concentrations and Related Diffusion Kinetics

doi:10.3389/fchem.2020.00502

IMR OpenIR

	Systematic Investigation of the Physical and Electrochemical Characteristics of the Vanadium (III) Acidic Electrolyte With Different Concentrations and Related Diffusion Kinetics
	Jing, Minghua; Li, Chengjie; An, Xinyu; Xu, Zeyu; Liu, Jianguo; Yan, Chuanwei; Fang, Dawei; Fan, Xinzhuang
	2020-07-14
发表期刊	FRONTIERS IN CHEMISTRY
卷号	8
摘要	Owing to the lack of systematic kinetic theory about the redox reaction of V(III)/V(II), the poor electrochemical performance of the negative process in vanadium flow batteries limits the overall battery performance to a great extent. As the key factors that influence electrode/electrolyte interfacial reactivity, the physicochemical properties of the V(III) acidic electrolyte play an important role in the redox reaction of V(III)/V(II), hence a systematic investigation of the physical and electrochemical characteristics of V(III) acidic electrolytes with different concentrations and related diffusion kinetics was conducted in this work. It was found that the surface tension and viscosity of the electrolyte increase with increasing V(III) concentration, while the corresponding conductivity shows an opposite trend. Both the surface tension and viscosity change slightly with increasing concentration of H2SO4, but the conductivity increases significantly, indicating that a lower V(III) concentration and a higher H(2)SO(4)concentration are conducive to the ion transfer process. The electrochemical measurements further show that a higher V(III) concentration will facilitate the redox reaction of V(III)/V(II), while the increase in H(2)SO(4)concentration only improves the ion transmission and has little effect on the electron transfer process. Furthermore, the diffusion kinetics of V(III) have been further studied with cyclic voltammetry and chronopotentiometry. The results show that an elevated temperature facilitates the V(III)/V(II) redox reaction and gives rise to an increased electrode reaction rate constant (k(s)) and diffusion coefficient [D-V(III)]. On this basis, the diffusion activation energy (13.7 kJ center dot mol(-1)) and the diffusion equation of V(III) are provided to integrate kinetic theory in the redox reaction of V(III)/V(II).
DOI	10.3389/fchem.2020.00502
WOS记录号	WOS:000556841800001
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/155688
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Jing, Minghua,Li, Chengjie,An, Xinyu,et al. Systematic Investigation of the Physical and Electrochemical Characteristics of the Vanadium (III) Acidic Electrolyte With Different Concentrations and Related Diffusion Kinetics[J]. FRONTIERS IN CHEMISTRY,2020,8.
APA	Jing, Minghua.,Li, Chengjie.,An, Xinyu.,Xu, Zeyu.,Liu, Jianguo.,...&Fan, Xinzhuang.(2020).Systematic Investigation of the Physical and Electrochemical Characteristics of the Vanadium (III) Acidic Electrolyte With Different Concentrations and Related Diffusion Kinetics.FRONTIERS IN CHEMISTRY,8.
MLA	Jing, Minghua,et al."Systematic Investigation of the Physical and Electrochemical Characteristics of the Vanadium (III) Acidic Electrolyte With Different Concentrations and Related Diffusion Kinetics".FRONTIERS IN CHEMISTRY 8(2020).