在LiCl-KCl-CeCl_3熔盐中铝电极上欠电位沉积制备Al-Ce合金（英文）  

Underpotential Deposition of Al-Ce Alloys at an Al Electrode from LiCl-KCl-CeCl_3 Melts

作　　者：张萌 李云娜 韩伟 张密林 薛云 王艳力 高杨 

机构地区：[1]哈尔滨工程大学核安全与仿真技术国防重点学科实验室,黑龙江哈尔滨150001 [2]哈尔滨工程大学超轻材料与表面技术教育部重点实验室,黑龙江哈尔滨150001

出　　处：《稀有金属材料与工程》2016年第8期1956-1960,共5页Rare Metal Materials and Engineering

基　　金：High Technology Research and Development Program of China(2011AA03A409);National Natural Science Foundation of China(51104050,91326113,21271054,21173060);Natural Science Foundation of Heilongjiang Province of China(E201413);China Postdoctoral Science Foundation(20110491029);Heilongjiang Postdoctoral Fund(LBH-Z10208);Heilongjiang Educational Commission Foundation(12513045);the Fundamental Research Funds for the Central Universities(HEUCF161501);the Scientific Technology Bureau of Harbin(2012RFQXS102);the Basic Research Foundation of Harbin Engineering University(HEUFT08031)

摘　　要：在843 K LiCl-KCl-CeCl_3熔盐中活性铝电极上,研究了Ce(Ⅲ)离子的电化学行为和欠电位沉积Al-Ce合金。对比循环伏安曲线发现,在Al电极上Ce(Ⅲ)/Ce反应的氧化还原电势比在Mo惰性电极上更正;开路计时电位在金属铝和铈的沉积平台之间出现2个平台,这表明Ce(Ⅲ)在A1活性电极上可以生成两种金属间化合物。以上结果在电化学机理上说明Ce(Ⅲ)离子可以在Al电极上欠电位沉积形成金属间化合物。在该实验条件下通过恒电位电解,在Al电极上得到了Al-Ce合金,验证了电化学分析的结果。经XRD表征,证实形成了AlCe和AlCe_3两种合金,结合Al-Ce合金相图分析了只产生这两种合金的原因;结合开路电位计算了生成这两种合金的标准吉布斯自由能变值。经SEM和EDS表征,证明了铈在Al电极表面分布,并形成厚度均一约28μm的Al-Ce合金镀层。Electrochemical behavior of Ce（Ⅲ） and underpotential deposition of Al-Ce alloys were investigated at an Al active electrode in LiCl-KCl-CeCl_3 melts.Compared with the cyclic voltammetry curves on a Mo electrode,the redox potential of Ce（Ⅲ）/Ce at the Al electrode is more positive;there are two new plateaus between the deposition plateau of Al and Ce metal by open circuit chronopotentiometry,which means two kinds of intermetallic compounds.All above show Ce（Ⅲ） forms intermetallic compound by underpotential deposition electrochemically.Furthermore,it is also confirmed by Al-Ce alloys,which are obtained at the Al active electrode in LiCl-KCl-CeCl_3 melts after potentiostatic deposition under the same condition.The formation of AlCe and AlCe_3 is illuminated by X-ray diffraction（XRD）.The reasons of AlCe and AlCe_3 formation were explained by XRD and phase diagram of Al-Ce.The standard Gibbs free energies of AlCe and AlCe_3 formation were calculated by XRD and open circuit chronopotentiometry.The analysis of scanning electron microscopy（SEM） and energy dispersive spectrometry（EDS） reveals that cerium exists at the surface of Al electrode to form an Al-Ce alloys layer,which is about 28 μm in thickness,and evenly coated the Al electrode.

关 键 词：LiC l-KCl熔盐 欠电位沉积 铝电极 Al-Ce合金 

分 类 号：TF821[冶金工程—有色金属冶金]