Preparation of CeNi_2 intermetallic compound by direct electroreduction of solid CeO_2 -2NiO in molten LiCl  

作　　者：张宇 尹华意 张生栋 汤迪勇 袁中伟 晏太红 郑卫芳 汪的华 

机构地区：[1]Department of Radiochemistry,China Institute of Atomic Energy [2]School of Resource and Environmental Science,Wuhan University

出　　处：《Journal of Rare Earths》2012年第9期923-927,共5页稀土学报（英文版）

基　　金：Project supported by National High Technology Research and Development Program ("863" Program) of China (2009AA050702);National Natural Science Foundation of China (20873093, 50934001);the Program for New Century Excellent Talents in University, Ministry of Education of China (NCET-08-0416);the International Cooperation Foundation, Ministry of Science and Technology of China (2009DFA62190)

摘　　要：Electrochemical reduction of solid CeO2-2NiO to produce CeNi2 was conducted in molten LiCI at 650℃. The electrochemical re- duction behaviors of NiO, CeO2 and their mixture were investigated by cyclic voltammetric measurements. Moreover, a series of electrolysis experiments of different electrolysis cell voltages and electrolysis duration were performed to evaluate the reduction mechanism of the mixed oxides pellet cathode as well as the energy efficiency of the process. Homogeneous CeNi2 was prepared by electrolysis at the constant cell voltage of 3.5 V with a graphite anode. The results demonstrated that the NiO was preferentially reduced to Ni and it subsequently promoted the reduction of CeO〉 The electrolysis energy consumption for preparation of the CeNi2 could be as low as 6.5 kWh/kg-CeNi2.Electrochemical reduction of solid CeO2-2NiO to produce CeNi2 was conducted in molten LiCI at 650℃. The electrochemical re- duction behaviors of NiO, CeO2 and their mixture were investigated by cyclic voltammetric measurements. Moreover, a series of electrolysis experiments of different electrolysis cell voltages and electrolysis duration were performed to evaluate the reduction mechanism of the mixed oxides pellet cathode as well as the energy efficiency of the process. Homogeneous CeNi2 was prepared by electrolysis at the constant cell voltage of 3.5 V with a graphite anode. The results demonstrated that the NiO was preferentially reduced to Ni and it subsequently promoted the reduction of CeO〉 The electrolysis energy consumption for preparation of the CeNi2 could be as low as 6.5 kWh/kg-CeNi2.

关 键 词：spent nuclear fuel CeNi2 solid state electrochemistry molten LiCl rare earths 

分 类 号：O614.332[理学—无机化学]