(中山大学化学与化学工程学院物理化学研究所， 广州 510275)
摘 要: 利用线性扫描伏安法研究了Yb(Ⅲ)在等摩尔NaCl-KCl熔体中Cu电极上还原的电化学行为及扩散系数。结果表明: Yb(Ⅲ)第一步可逆还原为Yb(Ⅱ)，Yb(Ⅱ)进一步还原并与Cu形成合金： Yb3++e=Yb2+, Yb2++2e+nCu=YbCun。 测定了Yb(Ⅲ)和Yb(Ⅱ)在973K NaCl-KCl熔体中的扩散系数分别为1.5×10-5和1.0×10-5 cm2s-1。用自耗阴极法在1123K, 阴极电流密度20 Acm-2, KCl-YbCl3(30%)熔体中制取了YbCu合金。
关键字: 镱离子 Yb-Cu合金 电还原 熔盐 制备
（Institute of Physical Chemistry, School of Chemistry and Chemical Engineering,
Zhongshan University, Guangzhou 510275, P. R. China）
Abstract:Linear sweep voltammetry has been used to study the redox of Yb(Ⅲ) in equimolar NaCl-KCl melt on the Cu cathode. It is reasonable to presume that the reduction of Yb(Ⅲ) to Yb(Ⅱ) is reversible on Cu electrode at first step and Yb(Ⅱ) is reduced to form alloy with Cu on Cu electrode surface: Yb3++e=Yb2+, Yb2++2e+nCu=YbCun. The diffusion coefficients of Yb(Ⅲ) and Yb(Ⅱ) in NaCl-KCl melt at 973 K are 1.5×10-5 and 1.0×10-5 cm2·s-1, respectively. The Yb-Cu alloy was prepared by consumable cathode in molten chlorides. The Yb-Cu alloy contains about 15% of Yb.
Key words: Yb(Ⅲ) ion Yb-Cu alloy electroreduction molten salt preparation
