物理化学学报 >> 2005, Vol. 21 >> Issue (12): 1422-1425.doi: 10.3866/PKU.WHXB20051220

研究简报 上一篇    下一篇

硫代硫酸盐在铂电极上的电化学氧化行为

徐良芹; 杜占合; 冯加民; 吕小丽; 高庆宇   

  1. 中国矿业大学化工学院, 江苏 徐州 221008
  • 收稿日期:2005-04-20 修回日期:2005-06-30 发布日期:2005-12-15
  • 通讯作者: 高庆宇 E-mail:gaoqy@cumt.edu.cn

The Behavior of Electrochemical Oxidation of Thiosulfate on Platinum Electrode

XU Liang-Qin; DU Zhan-He; FENG Jia-Min; LÜ Xiao-Li; GAO Qing-Yu   

  1. School of Chemical Engineering, China University of Mining and Technology, Xuzhou 221008
  • Received:2005-04-20 Revised:2005-06-30 Published:2005-12-15
  • Contact: GAO Qing-Yu E-mail:gaoqy@cumt.edu.cn

PDF

4045

赞

摘要： 用循环伏安法测定了硫代硫酸盐在铂电极上的电化学氧化行为, 结果表明, 其电化学氧化行为与体系的pH和扫描速度密切相关. 当pH为5~6时, 硫代硫酸盐的循环伏安曲线出现三个氧化峰, 峰电位分别在0.05 V、0.58 V和1.02 V附近, 随pH值升高和扫描速度的降低, 0.05 V附近的氧化峰逐渐变得明显, 同时各氧化峰的峰电位与扫描速度的对数, 峰电流与扫描速度的平方根均成很好的线性关系；当pH为8~9时, 硫代硫酸盐的循环伏安曲线出现三个明显的氧化峰, 峰电位分别在0.05 V、0.91 V和1.22 V附近. 随扫描速度降低, 循环伏安曲线出现交叉, 体系呈现明显的电化学振荡行为；但当pH=10时, 1.22 V附近的氧化峰消失. 硫代硫酸盐的电化学氧化行为非常复杂, 电化学氧化机制随体系pH的变化而变化.

关键词: 硫代硫酸盐, 铂电极, 循环伏安法, 电化学氧化, 电化学振荡

Abstract: The electrochemical oxidation of thiosulfate on platinum electrode was investigated by cyclic voltammetry. The results of experiments indicate that the behavior of electrochemical oxidation of thiosulfate depends on the pH and scan rate. When the pH value is 5 or 6, the cyclic voltammograms show three oxidation peaks at about 0.05 V, 0.58 V, and 1.02 V. With increasing pH value and decreasing the scan rate, the first oxidation peak becomes vary clear at about 0.05 V. Moreover the potential and the current of peaks have linear relationship with the logarithm and the square root of scan rate, respectively. When the pH value is 8~9, there are three obvious oxidation peaks at about 0.05 V, 0.91 V, and 1.22 V. The curves of cyclic voltammogram are crossed when decreasing the scan rate, and the system exhibits obvious electrochemical oscillations. But when the pH is over 10, the third oxidation peak disappears. The behavior of electrochemical oxidation of thiosulfate is very complicated and the mechanism varies along with the pH of the system.

Key words: Thiosulfate, Platinum electrode, Cyclic voltammetry, Electrochemical oxidation, Electrochemical oscillations