化学还原法制备钒电池电解液中还原剂选择及性能

doi:10.16085/j.issn.1000-6613.2017.01.034

化工进展 ›› 2017, Vol. 36 ›› Issue (01): 274-281.DOI: 10.16085/j.issn.1000-6613.2017.01.034

化学还原法制备钒电池电解液中还原剂选择及性能

杨亚东^1,2, 张一敏^1,2,3, 黄晶^1,2,3, 刘涛^1,2,3, 郑秋实^1,2

1 武汉科技大学资源与环境工程学院, 湖北武汉 430081;
2 钒资源高效利用湖北省协同创新中心, 湖北武汉 430081;
3 湖北省页岩钒资源高效清洁利用工程技术研究中心, 湖北武汉 430081

收稿日期:2016-06-07 修回日期:2016-08-03 出版日期:2017-01-05 发布日期:2017-01-05
通讯作者: 张一敏,教授,研究方向为高效洁净矿物加工理论与工艺、湿法冶金、二次资源利用。E-mail:zym126135@126.com。
作者简介:杨亚东(1992-),男,硕士研究生。E-mail:yangyadong1016@sina.com。
基金资助:
国家自然科学基金（51474162），51404174）及教育部科学技术研究项目（213025A）。

Reducing agent selection and performance study of electrolyte for vanadium redox battery prepared by chemical reduction method

YANG Yadong^1,2, ZHANG Yimin^1,2,3, HUANG Jing^1,2,3, LIU Tao^1,2,3, ZHENG Qiushi^1,2

1 College of Resource and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;
2 Hubei Collaborative Innovation Center of High Efficient Utilization for Vanadium Resources, Wuhan 430081, Hubei, China;
3 Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource, Wuhan 430081, Hubei, China

Received:2016-06-07 Revised:2016-08-03 Online:2017-01-05 Published:2017-01-05

摘要/Abstract

摘要： 以V₂O₅为原料，采用化学还原法制备钒电池电解液。对比草酸、抗坏血酸、酒石酸、柠檬酸、双氧水、甲酸、乙酸制备所得钒电池电解液的转化率、还原率及电化学性能，发现草酸制得的电解液转化率及还原率较高，且其电化学活性明显优于其他还原剂。对草酸制备电解液的反应动力学进行分析，发现该反应为放热反应且在常温下能自发进行。对制备过程中的各项参数进行优化，在n（H₂C₂O₄）：n（V₂O₅）=1：1、反应温度90℃、反应时间100min、n（H₂SO₄）：n（V₂O₅）=5：1的条件下，电解液的转化率与还原率达到了94.80%和93.55%。草酸和VOSO₄制备的电解液电化学分析结果表明草酸制备的电解液能够抑制析氧副反应的发生，具有较大的扩散系数、交换电流密度、电极反应标准速率常数和较小的极化电阻，对电极反应的传质过程和传荷过程有促进作用，提高了电极反应速率。以草酸为还原剂能够在较低温度下高效地制备具有良好的电化学性能及稳定性的钒电池电解液。

关键词: 全钒液流电池, 电解液, 电化学

Abstract: The electrolyte for vanadium redox battery was prepared using chemical reduction method with vanadium pentoxide as raw materials. The conversion rate,reducing rate and electrochemical properties of electrolyte prepared by oxalic acid,ascorbic acid,tartaric acid,citric acid,hydrogen peroxide,formic acid,and acetic acid were compared. It was found that oxalic acid had higher conversion rate,higher reducing rate,and better electrochemical activity. The reaction kinetics analysis indicated that the reaction of oxalic acid reduction is exothermic reaction,and could proceed spontaneously at room temperature. The parameters of preparation process was optimized,under the conditions of n(H₂C₂O₄):n(V₂O₅)=1:1,reaction temperature 90℃,reaction time 100min and n(H₂SO₄):n(V₂O₅)=5:1,the conversion rate and reducing rate reached 94.8% and 93.55%,respectively. The electrochemical analysis of electrolyte showed that the electrolyte prepared by oxalic acid could inhibit the oxygen evolution reaction. It also showed that the mass transfer and charge transfer process and reaction rate were improved. Using oxalic acid as reducing agent could prepare electrolyte efficiently in lower temperature,and the prepared electrolyte has good electrochemical properties and stability.

Key words: vanadium redox battery, electrolyte, electrochemical

中图分类号:

O 642

杨亚东, 张一敏, 黄晶, 刘涛, 郑秋实. 化学还原法制备钒电池电解液中还原剂选择及性能[J]. 化工进展, 2017, 36(01): 274-281.

YANG Yadong, ZHANG Yimin, HUANG Jing, LIU Tao, ZHENG Qiushi. Reducing agent selection and performance study of electrolyte for vanadium redox battery prepared by chemical reduction method[J]. Chemical Industry and Engineering Progree, 2017, 36(01): 274-281.

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化学还原法制备钒电池电解液中还原剂选择及性能

Reducing agent selection and performance study of electrolyte for vanadium redox battery prepared by chemical reduction method

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