铈离子对镍电结晶过程的影响

为了解铈离子对镍电沉积电极过程的影响,采用线性扫描伏安法、单电位阶跃计时电流法、交流阻抗谱等方法,对镍在玻碳电极上的电沉积进行了研究。实验结果表明：CeCl3的加入使镍离子的扩散系数下降、电荷传递电阻增大,加大了镍沉积的阴极极化,同时使电结晶成核速率常数增大,晶体向外生长速度下降。这些变化可能与Ce^3＋及在沉积过程中形成的Ce^3＋多核配离子吸附在阴极表面有关。但铈离子的加入没有改变镍在玻碳电极上的电结晶成核机理。

Effects of Cerium Ions on the Electrocrystallization of Nickel

To understand the cathodic process of nickel electrodeposition,linear sweep voltammetry,single potential step chronoamperometry and electrochemical impedance spectroscopy were employed to comparatively study the electrocrystallization of nickel in watts bath and watts bath containing cerium ions.The experimental results show that the addition of CeCl3 decreases the diffusion coefficient of Ni2+ and enhances charge transfer resistance,resulting in the increase in cathodic polarization;Simultaneously,it incre...