LiCl-KCl、NaCl-KCl和KCl熔盐体系中Ce(Ⅲ)的电化学行为  

Electrochemical Behavior of Ce(Ⅲ)in LiCl-KCl,NaCl-KCl and KCl Molten Salt

作　　者：张磊[1] 王有群[1,2] 谢书宝 王文涛[1] 郑卫芳 ZHANG Lei;WANG You-qun;XIE Shu-bao;WANG Wen-tao;ZHENG Wei-fang(China Institute of Atomic Energy,P.O.Box 275(26),Beijing 102413,China;School of Nuclear Science and Engineering,East China University of Technology,Nanchang 330013,China)

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413 [2]东华理工大学核科学与工程学院,江西南昌330013

出　　处：《核化学与放射化学》2021年第5期379-386,I0003,共9页Journal of Nuclear and Radiochemistry

摘　　要：对比了Ce(Ⅲ)在LiCl-KCl、NaCl-KCl和KCl熔盐体系中Mo电极上的电化学行为。结果表明:高温NaCl-KCl、KCl熔盐体系中由于Ce(Ⅲ)与Na(Ⅰ)和K(Ⅰ)的还原电位相近,会发生大量基体盐元素的还原,而低温LiCl-KCl熔盐体系中Ce(Ⅲ)未发生上述现象;LiCl-KCl熔盐体系中Ce(Ⅲ)的还原反应为一步三电子转移的可逆过程,采用循环伏安法和计时电位法计算得到扩散系数与温度的关系式分别为ln D=-4341.5/T-7.97和ln D=-4346.6/T-7.39;表观还原电位与温度的关系式为E,*(Ce(Ⅲ)/Ce)=0.00072 T-3.650。The electrochemical behaviors of Ce(Ⅲ)on Mo electrodes in LiCl-KCl,NaCl-KCl and KCl molten salt were compared at different temperatures.The results show that in the high-temperature NaCl-KCl and KCl molten salt systems,since Ce(Ⅲ),Na(Ⅰ)and K(Ⅰ)have similar reduction potentials,with a large amount of matrix element co-reduction will occur,while in low-temperature LiCl-KCl Ce(Ⅲ)does not occur as described above.The reduction reaction of Ce(Ⅲ)in the LiCl-KCl molten salt system is a one-step three-electron transfer reversible reaction.The relationship between the diffusion coefficient and temperature from CV and CP is calculated respectively.The formulas are ln D=-4341.5/T-7.97 and ln D=-4346.6/T-7.39,the relationship between apparent reduction potential and temperature is E,*(Ce(Ⅲ)/Ce)=0.00072 T-3.650.

关 键 词：Ce(Ⅲ) 熔盐 电化学行为 高温化学 

分 类 号：TL214.2[核科学技术—核燃料循环与材料]