详细信息
KCl-NaCl-MgCl_2熔盐中镁在铂电极上的阴极还原
The Cathodic Reduction of Magnesium in KCl-NaCl-MgCl_2 Melts on a Platinum Electrode
文献类型:期刊文献
中文题名:KCl-NaCl-MgCl_2熔盐中镁在铂电极上的阴极还原
英文题名:The Cathodic Reduction of Magnesium in KCl-NaCl-MgCl_2 Melts on a Platinum Electrode
作者:刘江宁[1];孙泽[1];晋心文[1];李冰[1];宋兴福[1];于建国[1]
机构:[1]华东理工大学盐湖工业技术研究中心,上海200237
年份:2007
期号:6
起止页码:35
中文期刊名:有色金属(冶炼部分)
外文期刊名:Nonferrous Metals(Extractive Metallurgy)
收录:CSTPCD;;北大核心:【北大核心2004】;
语种:中文
中文关键词:氯化镁;熔盐;循环伏安法;计时电位法;扩散控制
外文关键词:Magnesium chloride; Molten salts;Cyclic voltammetry; Chronopotentiometry; Diffusion controlled
摘要:采用循环伏安法、计时电流法和计时电位法研究了KCl-NaCl-MgCl2熔盐中镁在Pt电极上电解沉积的电化学还原机理及其控制步骤。结果表明:镁在Pt电极上析出,先与Pt形成合金,然后才以纯镁的形式存在;镁的析出过程是包含两个电子的受扩散过程控制的准可逆反应;并测定了不同温度下镁离子在熔盐中的扩散系数,结果表明扩散系数与反应温度之间的关系服从Arrhenius方程,即D=D0exp(-E/RT),其中E=36.1 kJ/mol,D0=0.0041 cm2/s。
Cyclic voltammetry, chronopotentiometry and chronoamperometry were used to study the electroreduction mechanism and controlling step of magnesium electrodepositing on Pt electrode from KCl- NaCl-MgCl2 molten salts. It was found that magnesium deposited on Pt cathode formed boundary alloy with Pt firstly, then existing in pure magnesium. The electroreduction process of magnesium depositing is a quasi-reversible diffusion controlled reaction including two electrons transfer. The relation between diffusion coefficient of magnesium ion in molten salts and temperature is expressed by the Arrhenius equation:D=Doexp(-E/RT), where E=36.1 kJ/mol, Do=0. 0041 cm2/s.
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