CaO在CaCl_2和等摩尔CaCl_2-X(X=NaCl，BaCl_2，LiCl)熔盐中的阴极行为  

CATHODIC BEHAVIORS OF CaO IN MOLTEN SALTS CaCl_2 AND EQUIMOLAR CaCl_2-X(X=NaCl, BaCl_2,LiCl)

作　　者：王淑兰[1] 王伟[1] 王川华[1] 张丽君[1] 

机构地区：[1]东北大学理学院,沈阳110004

出　　处：《金属学报》2008年第6期735-738,共4页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目资助50674027

摘　　要：采用循环伏安方法研究了1173 K时Cacl_2-0.5%CaO(摩尔分数)和等摩尔CaCl_2-X-0.5%caO(X=NaCl,BaCl_2,LiCl)熔盐中CaO在Mo电极上的阴极行为,研究结果表明,CaCl_2与CaO电离的Ca^(2+)具有不同的离子结构和还原电势,在1173 K时其还原峰电势分别为-2.15和-1.51 V.等摩尔混合熔盐CaCl_2-X-0.5%CaO(Z=NaCl,BaCl_2)中,CaO诱发电解质产生低电位沉积,降低了混合熔盐的电化学稳定性,通过阴极扫描电流峰密度与扫描速率的关系,计算出1173 K时CaO电离的Ca^(2+)在CaCl_2 0.5%CaO,等摩尔的CaCl_2-NaCl-0.5%Ca0,CaCl_2-BaCl_2-0.5%CaO和CaCl_2-LiCl-0.5%CaO熔盐中的扩散系数,分别为6.42×10^(-5),1.56×10^(-5),1.20×10^(-5)和6.79×10^(-5) cm^2/s。Cathodic behaviors of CaO at 1173 K on molybdenum electrode in molten salts CaCl2 0.5%CaO （molar fraction） and equimolar CaCl2-X-0.5%CaO （X=NaCl, BaCl2, LiCl） were studied by cyclicvoltamme technique. At 1173 K the ion structures and reduced potentials of Ca^2＋ from CaCl2 and CaO are different and their reduced peak potentials are -2.15 and -1.51 V, respectively. CaO induced the under-potential depositions of equimolar molten salts CaCl2-x （x=NaCl, BaCl2） and lowed their electrochemical stabilities. The diffusion coefficients of Ca^2＋ from CaO in CaCl2-0.5%CaO, equimolar CaCl2-NaCl-0.5%CaO, CaCl2-BaCl2-0.5%CaO and CaCl2-LiCl-0.5%CaO at 1173 K were obtained and are 6.42×10^-5, 1.56×10^-5, 1.20×10^-5, and 6.79×10^-5 cm2/s, respectively.

关 键 词：循环伏安 CAO CACL2 熔盐 还原电势 

分 类 号：TF803.2[冶金工程—有色金属冶金] TG832[金属学及工艺—公差测量技术]