低温熔盐中Ni(Ⅱ)、Co(Ⅱ)诱导稀土共沉积的电化学行为  

Electrochemical Behaviors of Inductive Rare Earths Codeposition of Ni(Ⅱ) and Co(Ⅱ) in Low Temperature Melt Salt

作　　者：陈必清[1] 刘青[1] 王建朝[1] 王金贵[1] 

机构地区：[1]青海师范大学化学系,青海西宁810008

出　　处：《青海师范大学学报（自然科学版）》2006年第3期64-67,共4页Journal of Qinghai Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50264004)

摘　　要：在353K的乙酰胺-尿素-NaBr熔体中,利用循环伏安法,研究了Pt、Cu电极上,Ni(Ⅱ)和Co(Ⅱ)的电还原为金属是一步完全不可逆反应,测得乙酰胺-尿素-NaBr中,Ni(Ⅱ)在Pt上,传递系数α=0.27,扩散系数D0=6.51×10-5cm2.s-1,Cu上α=0.26,D0=6.02×10-7cm2.s-1.Co(Ⅱ)在Pt上,传递系数α=0.28,扩散系数D0=4.68×10-5cm2.s-1,Cu上α=0.28,D0=4.06×10-7cm2.s-1.上述熔体中,稀土RE(Ⅲ)不能单独还原为RE(0),但可以被Ni(Ⅱ)和Co(Ⅱ)诱导共沉积,合金膜由X-射线能谱(EDS)证实.Electroreduction of Ni^2＋ and Co^2＋ in acetamide-urea-NaBr melt on Pt and Cu electrode at 353K by cyclic voltammetry is irreversible in one step. At Pt and Cu eletrode the diffusion coefficient and electron transfer coefficient of Ni^2＋ and Co^2＋ in acetamide-urea-NaBr melt were determined. Ni^2＋ , the transfer coefficient α = 0.27 and diffusion coefficient Do = 6.51 × 10^-5 cm^2 s^-1 on the Pt eletrode and transfer coefficient α = 0.26 and diffusion coefficient Do = 6.02 × 10^-7 cm^2·s^-1 on the Cu eletrode were measured. Co^2＋ , the transfer coefficient α = 0.28 and diffusion coefficient Do = 4.68 × 10^5 cm^2· s^-1 on the Pt eletrode and transfer coefficient α = 0.28 and diffusion coeffi- cient Do =4.06×10^7 cm^2·s^-1 on the Cu detrede were measured. Rare earth Re3~ is not reduced to Re alone , but can be inductively cedeposited with Ni^2＋ and Co^2＋ . The alloy films were proved by X-ray spectrum.

关 键 词：乙酰胺-尿素-NABR熔体 稀土 NI CO 传递系数 扩散系数 诱导共沉积 

分 类 号：O641.4[理学—物理化学]