二甲基亚砜中Dy和Co的电化学行为

Eletrochemical Behaviour of Dysprosium and Cobalt in Dimethylsolfoxide

利用循环伏安法和计时电流法研究了室温下Dy和Co在二甲基亚砜中的电化学行为 :Dy (Ⅲ )和Co (Ⅱ )在Pt电极上分别为一步不可逆还原为Dy (0 ) ,Co (0 ) ;研究了不同浓度的支持电解质对Dy (Ⅲ )的传递系数的影响 ;测定并得到 0 0 1mol·dm-3 Dy (NO3 ) 3 +0 1mol·dm-3 LiClO4 +DMSO体系中Dy(Ⅲ )的扩散系数D0 =2 86× 10 -6cm2 ·s-1(2 98K)和传递系数α =0 14.在 0 0 2mol·dm-3 CoCl2 +0 486mol·dm-3LiClO4 +DMSO体系中Co(Ⅱ )的D0 =1 35× 10 -5cm2 ·s-1(2 98K)和α =0 2 4;并测出Dy(Ⅲ )和Co(Ⅱ )可在Pt电极上诱导共沉积生成Dy

The eletrochemical behaviours of Dy(Ⅲ) and Co(Ⅱ) at ambient temperature in DMSO were studied by cyclic voltammetry and chronoamperometry. At Pt eletrode Dy(Ⅲ) and Co(Ⅱ) were reduced to Dy(0) and Co(0) through one-step irreverible eletrode reaction respectively. The influence of different eletrolyte concentration on the transfer coefficient of Dy(Ⅲ) was also discussed. The diffusion coefficient D 0=2.86×10 -6 cm 2·s -1 (298 K) and transfer coefficient α=0.14 of Dy(Ⅲ) and the diffusion coefficient D 0=1.35×10 -6 cm 2·s -1(298 K) and transfer coefficient α=0.24 of Co(Ⅱ) were measured. The codeposition of Dy(Ⅲ) and Co(Ⅱ) on Pt electrode belongs to induced codeposition.