钒电解液的绿色制备及其热力学分析

doi:10.3724/SP.J.1077.2011.00535

无机材料学报 ›› 2011, Vol. 26 ›› Issue (5): 535-539.DOI: 10.3724/SP.J.1077.2011.00535 CSTR: 32189.14.SP.J.1077.2011.00535

钒电解液的绿色制备及其热力学分析

吴雄伟¹, 彭穗¹, 冯必钧¹, 山村朝雄², 矢野贵², 佐藤伊佐務², 刘素琴¹, 黄可龙¹

(1. 中南大学化学化工学院, 长沙 410083; 2. 日本东北大学, 日本仙台 9808577）

收稿日期:2010-07-02 修回日期:2010-11-01 出版日期:2011-05-20 网络出版日期:2011-06-07
作者简介:吴雄伟(1980-), 男, 博士研究生. E-mail: wxwcsu@yahoo.cn
基金资助:
国家重点基础研究发展计划(2010CB227201); 国家自然科学基金(50972165)

Preparation, Thermodynamic and Electrochemical Properties of Vanadium Solution

WU Xiong-Wei¹, PENG Sui¹, FENG Bi-Jun¹, Yamamura Tomoo², Takashi Yano², Satoh Isamu², LIU Su-Qin¹, HUANG Ke-Long¹

(1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; 2. Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan)

Received:2010-07-02 Revised:2010-11-01 Published:2011-05-20 Online:2011-06-07
Supported by:
The National Basic Research Program of China (2010CB227201); National Natural Science Foundation of China (50972165)

摘要/Abstract

摘要： 以分析纯V₂O₅为原料, 利用双氧水还原的方法制备钒电解液, 并对五氧化二钒的溶解机理进行了研究. 通过UV-Vis光谱分析和ICP, 对钒电解液在电解过程中钒离子的价态变化和浓度变化进行表征. 通过计算, 得到了钒电解液制备的反应焓变和吉布斯自由能变化, 结果表明: 生成硫酸氧钒的反应为放热反应, 并且该反应促进了五价钒离子的溶解. 将所制备的电解液组装成动态电池, 在电流密度为2.4 mA/cm²时, 电池的电流效率、电压效率、能量效率分别为93.6%、98.1%和91.9%, 充放电结果表明: 所制备的电解液具有很好的活性, 可以应用于钒电池.

关键词: 钒液流电池, 电解液, 热力学

Abstract: The vanadium solution was prepared by the mixture of hydrogen peroxide and vanadium pentoxide in sulphuric acid solution. The solubility mechanism of vanadium pentoxide was investigated. The valence and concentration change of vanadium solution were characterized by UV-Vis and ICP measurement in the following electrolysis procedure. △H and △G of the reaction were calculated. The results showed that the reaction was exothermic. The electrochemical activity was characterized by the charging and discharging experiment. And the results showed that the high current efficiency, voltage efficiency and energy efficiency of 93.6%, 98.1% and 91.9% were obtained at the current density of 2.4 mA/cm², respectively. This indicated that the prepared vanadium solution was suitable for vanadium redox-flow battery.

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

中图分类号:

O642

吴雄伟, 彭穗, 冯必钧, 山村朝雄, 矢野贵, 佐藤伊佐務, 刘素琴, 黄可龙. 钒电解液的绿色制备及其热力学分析[J]. 无机材料学报, 2011, 26(5): 535-539.

WU Xiong-Wei, PENG Sui, FENG Bi-Jun, Yamamura Tomoo, Takashi Yano, Satoh Isamu, LIU Su-Qin, HUANG Ke-Long. Preparation, Thermodynamic and Electrochemical Properties of Vanadium Solution[J]. Journal of Inorganic Materials, 2011, 26(5): 535-539.

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钒电解液的绿色制备及其热力学分析

Preparation, Thermodynamic and Electrochemical Properties of Vanadium Solution

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