二甲基亚砜中Co^(2+)、Ni^(2+)和Fe^(2+)的电化学行为

Study on the electrochemical behaviors of Co^(2+)、Ni^(2+) and Fe^(2+) in dimethylsulfoxide

研究了二甲基亚砜中Co2+、Ni2+和Fe2+电化学行为.在1 00×10-2mol·L-1CoCl2-0 1mol·L-1LiClO4-DMSO、1 00×10-2mol·L-1NiCl2-0 1mol·L-1LiClO4-DMSO和1 00×10-2mol·L-1FeCl2-0 1mol·L-1LiClO4-DMSO体系中利用循环伏安法和计时电流法测定3种体系中Co2+、Ni2+和Fe2+的扩散系数DO.结果在304K时,循环伏安法测定3种体系中Co2+、Ni2+和Fe2+的扩散系数DO分别为1 31×10-5、1 27×10-5和1 59×10-5cm2·s-1;在299K时,计时电流法测定Co2+、Ni2+和Fe2+的扩散系数DO分别为:1 01×10-5、1 43×10-5和1 39×10-5cm2·s-1.

The electrochemical behaviors of Co^(2+), Ni^(2+) and Fe^(2+) on Pt electrode are studied by cyclicvoltammetry and chronoamperometry methods in 1.00×10^(-2) mol·L^(-1)FeCl_2-0.1 mol·L^(-1)LiClO_4-DMSO, 1.00×10^(-2) mol(L^(-1)CoCl_2-0.1 mol·L^(-1)LiClO_4-DMSO and 1.00×10^(-2) mol·L^(-1)NiCl_2-0.1 mol·L^(-1)LiClO_4-DMSO, respectively. The diffusion coefficients of Co^(2+), Ni^(2+) and Fe^(2+) are measured by two electrochemical methods. One of which is cyclicvoltammetry methods, the diffusion coefficients are 1.31×10^(-5),1.27×10^(-5) and 1.59×10^(-5) cm^2·s^(-1) at 304 K, respectively. The other is chronoamperometry methods, the diffusion coefficients are 1.01×10^(-5), 1.43×10^(-5) and 1.39×10^(-5) cm^2·s^(-1) at 299 K, respectively.