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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (16): 1858-1864. 上一篇    下一篇

研究论文

钒电解液的制备及其电化学和热力学分析

吴雄伟*,1，李厦1，黄可龙*,1，丁正平1，姜志成1，刘素琴1，李晓刚2   

  1. (1中南大学化学化工学院 长沙 410083)
    (2湖南农业大学生物安全科学技术学院 长沙 410128)
  • 投稿日期:2010-12-13 修回日期:2011-03-16 发布日期:2011-04-13
  • 通讯作者: 黄可龙 E-mail:klhuang@lsioc.cn
  • 基金资助:

    国家重点基础研究发展计划 (973计划);高能密度全钒液流储能系统活性物稳定机制的研究;湖南省自然科学基金

Preparation, Thermodynamic and Electrochemical Properties of Vanadium Solution

Wu Xiongwei*,1 Li Sha1 Huang Kelong*,1 Ding Zhengping1 Jlang Zhicheng1 Liu Suqin1 Li Xiaogang2   

  1. (1 School of Chemistry and Chemical Engineering, Central South University, Changsha 410083)
    (2 College of Bio-safty Science and Technology, Hunan Agricultural University, Changsha 410128)
  • Received:2010-12-13 Revised:2011-03-16 Published:2011-04-13
  • Supported by:

    ;The Scientific Research Foundation of Hunan Province

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1309

被引次数

15

以冶金级V2O3和V2O5为原料, 采用混合加热和自催化强化溶解相结合的方法制备钒电解液. 通过热力学分析, 从理论上计算并确定了V2O5和V2O3溶解过程中在硫酸溶液中的离子存在形式, 从而计算了钒电解液VOSO4过程的吉布斯自由能变化?rGm, 以及相应的反应生成焓?rHm. 结果表明: 反应为放热反应, 且为自发过程(?rGm＜0). 同时通过UV-Vis光谱对所制备的电解液存在形式进行表征, 证实了理论分析的正确性|使用循环伏安和充放电对其电化学性能予以分析, 所得钒电解液具有很好的电化学性能.

关键词: 钒液流电池, 电解液, 热力学

The vanadium solution was prepared by heating the mixture of vanadium trioxide and vanadium pentoxide in sulfuric acid solution, which utilized the autocatalytic effect of vanadium with mixed valence, to intensify the dissolving of the mixture of vanadium trioxide and vanadium pentoxide. The formations of vanadium ions were theoretically determined. Moreover, negative ?rGm and ?rHm of the reactions were calculated by thermomechanical analysis. The reactions was proved to be a spontaneous process (?rGm＜0). The results were confirmed by the UV-Vis analysis for the formation of ions. Its electrochemical performance was characterized by cyclic voltammetry and charge-discharge. The results showed that the prepared vanadium solution had an excellent electrochemical behavior, which indicated that the method was suitable for the industrial application. Our work may serve as the theoretical basis for industrial production of the electrolyte of vanadium redox-flow batteries.

Key words: redox-flow battery, vanadium solution, thermodynamic