摘要
三价锑常用作锌粉置换法除去硫酸锌电解液中钻杂质的活化剂。在此过程中三价锑本身也被还原。置换反应本质上是一个电化学过程。因此,研究三价锑的阴极还原行为是有意义的。关于三价锑的阴极还原,Koval等研究了酒石酸盐溶液中Sb（Ⅲ）的电沉积。Tomlinson曾指出,在高电流密度下电解时,阴极上会析出锑化氢（SbH3）。吴浩青等在研究酸性溶液中锑电极的电化学行为时,也曾指出了SbH3的生成。本文采用旋转电极上的动电位扫描、旋转环盘电极以及交流阻抗技术研究硫酸钠溶液中SbO+离子的阴极还原过程。
The cathodic reduction of SbO^+ ions in sodium sulphate solution at pH 4.0 has been investigated using potentiodynamic polarization at rotating disc electrode (RDE), rotating ring disc electrode(RRDE) and AC impedance techniques. Results show that SbO^+ ions can be eventually reduced to stibine SbH_3 through a 6-electron process, whose formation is confirmed by RRDE experiments. The reduction is diffusioncontrolled at potentials negative to -1.28V. The values of the diffusion coefficient of SbO^+ ions calculated on the basis of the experimental results for 3-electron and 6-electron reduction are very consistent; they are (1.45+0.15)×10^(-6)cm^2.s^(-1) and (1.47+0.15)×10^(-6)cm^2.s^(-1), respectively.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1991年第3期354-357,共4页
Acta Physico-Chimica Sinica
关键词
Sbo^+
阴极还原
活化剂
扩散系数
Antimonyl ion, Stibine, Cathodic reduction, Diffusion coefficient, Activator
