The processes of nucleation and growth of lead from the dilute electrolytes on copper substrates were investigated bychronoamperometry and by scanning electron microscopic (SEM) analysis of the deposits obtained in th...The processes of nucleation and growth of lead from the dilute electrolytes on copper substrates were investigated bychronoamperometry and by scanning electron microscopic (SEM) analysis of the deposits obtained in the potentiostatic regime ofelectrolysis. In the dependence of electrodeposition conditions, the nucleation of Pb followed either progressive or instantaneoustype. The type of nucleation changed from progressive to instantaneous one with increasing the concentration of Pb(II) ions and theoverpotential of electrodeposition. Regardless of the type nucleation, a novel type of Pb particles like cobweb was formed by thepotentiostatic electrodeposition in the moment of nucleation and at the early stages of growth. On the basis of the shape ofcobweb-like particles and the electrodeposition conditions leading to their formation, these particles were situated in the group ofspongy-like ones. Also, comparative morphological analysis of Pb deposits obtained in the conditions of progressive andinstantaneous nucleation confirmed the existence of two limiting types of nucleation.展开更多
基金supported by the Ministry of Education,Science and Technological Development of the Republic of Serbia under the research project:“Electrochemical synthesis and characterization of nanostructured functional materials for application in new technologies”(Project No.172046)
文摘The processes of nucleation and growth of lead from the dilute electrolytes on copper substrates were investigated bychronoamperometry and by scanning electron microscopic (SEM) analysis of the deposits obtained in the potentiostatic regime ofelectrolysis. In the dependence of electrodeposition conditions, the nucleation of Pb followed either progressive or instantaneoustype. The type of nucleation changed from progressive to instantaneous one with increasing the concentration of Pb(II) ions and theoverpotential of electrodeposition. Regardless of the type nucleation, a novel type of Pb particles like cobweb was formed by thepotentiostatic electrodeposition in the moment of nucleation and at the early stages of growth. On the basis of the shape ofcobweb-like particles and the electrodeposition conditions leading to their formation, these particles were situated in the group ofspongy-like ones. Also, comparative morphological analysis of Pb deposits obtained in the conditions of progressive andinstantaneous nucleation confirmed the existence of two limiting types of nucleation.
