文档介绍：2011 年第 69 卷化学学报 Vol. 69, 2011
第 16 期, 1858~1864 ACTA CHIMICA SINICA No. 16, 1858~1864
·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*,a 李厦 a 黄可龙*,a 丁正平 a
姜志成 a 刘素琴 a 李晓刚 b
(a 中南大学化学化工学院长沙 410083)
(b 湖南农业大学生物安全科学技术学院长沙 410128)
摘要以冶金级 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
Preparation, Thermodynamic and Electrochemical Properties of
Vanadium Solution
Wu, Xiongwei*,a Li, Shaa Huang, Kelong*,a Ding, Zhengpinga
Jiang, Zhichenga Liu, Suqina Li, Xiaogangb
(a School of Chemistry and Chemical Engineering, Central South University, Changsha 410083)
(b College of Bio-safty Science and Technology, Hunan Agricultural University, Changsha 410128)
Abstract 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 cal-
culated by thermomechanical analysis. The re