硫化物在铂电极上电化学氧化的硫沉积动力学  

Deposition dynamics of sulfur in the electrochemical oxidation of sulfide on Pt electrode

作　　者：胡雪凤[1] 解京选[1] 徐丽[1] 刘海苗[1] 吕小丽[1] 高庆宇[1] 

机构地区：[1]中国矿业大学化工学院,江苏徐州221008

出　　处：《中国科技论文在线》2009年第6期453-458,共6页

基　　金：国家自然科学基金(20573134);高等学校博士学科点专项科研基金(20050290512);江苏省自然科学基金(BK2007037)

摘　　要：运用了线性电流伏安法和计时电势法对不同浓度的硫化钠溶液在多晶铂电极上电化学氧化动力学行为和机理进行研究,并在此基础上找到生成单质硫的优化条件。从硫化钠电化学氧化线性电流伏安图中可以发现,电流扫描速率越低,溶液浓度越大,越有利于硫的沉积,硫的稳定沉积发生在电极电势为0V附近平台区域。低电流密度下改变电流值,计时电势曲线上发现了双阵发振荡等复杂振荡行为。随着电流密度的增大,最终形成一个氧气析出的不规则振荡区,这个区域对应着多硫离子的大量生成。The dynamical behavior and mechanism in the electrochemical oxidation of sulfide on a polycrystalline platinum electrode was studied under linear galvanic voltammetry （LGV） and chronopotentiometry （CP） methods with different sulfide concentrations. The optimal conditions of experiment for yielding sulfur were obtained based on these electrochemical methods. From the linear galvanic voltammograms, we found the lower current density scan rate and the larger sulfide concentration was favorable for producing sulfur. Sulfur formation and stable deposition occurred in the platform with potential around 0 V. Many complex oscillations such as double-burst oscillations and period-doubling oscillations were observed when current changed in low current density region. At the range of high current, there existed an irregular oscillatory region from oxygen evolution as well as the polysulfide production process.

关 键 词：物理化学 硫化钠 电化学氧化 线性电流伏安 计时电势 硫沉积 

分 类 号：O646[理学—物理化学]