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采用计时电流方法和对恒电位电解得到的沉积产物进行SEM观察,研究稀溶液中铅在铜电极上的成核和生长过程。根据电沉积条件不同,铅的成核分为连续成核和瞬时成核两种形式。随着溶液中Pb(II)浓度和电沉积时超电势的增加,成核形式从连续成核转变为瞬时成核。无论是哪种成核形式,在恒电位电解的成核和早期生长阶段,生成的铅颗粒都是蛛网状的。根据蛛网状颗粒的形状和导致它们生成的电沉积条件,这些颗粒属于海绵状颗粒。对连续成核和瞬时成核条件下的铅沉积产物的形貌观察表明,存在两种成核极限。
The chronoamperometry and the deposition products obtained by potentiostatic electrolysis were observed by SEM to study the nucleation and growth of lead on copper electrode in dilute solution. According to different electrodeposition conditions, lead nucleation is divided into continuous nucleation and instantaneous nucleation two forms. With increasing concentrations of Pb (II) in the solution and overpotentials at electrodeposition, the nucleation pattern transforms from continuous nucleation to transient nucleation. Regardless of the form of nucleation, lead particles are cobweb-like during the nucleation and early growth stages of potentiostatic electrolysis. Depending on the shape of the cobweb particles and the electrodeposition conditions that led to them, these particles belong to spongy particles. The morphologies of the lead deposition products under continuous nucleation and transient nucleation show that there are two nucleation limits.