Early Stages of CeO_(2) Thin-film Nucleation and Growth with Photo Irradiation
作者机构：College of Materials and ChemistryChina Jiliang UniversityHangzhou310018P.R.China Department of ChemistryZhejiang UniversityHangzhou310027P.R.China College of Chemistry and Chemical EngineeringHunan UniversityChangsha410082P.R.China
出 版 物：《Chemical Research in Chinese Universities》 (高等学校化学研究（英文版）)
年 卷 期：2021年第37卷第3期
页 面：696-703页
核心收录：
基 金：This work was supported by the National Natural Science Foundation of China(Nos.52001300 51771173 21171155 and 51471156).
主 题：Photo illumination Anodic electrodeposition CeO_(2)film Nucleation and growth
摘 要：In this paper,the early stages of nucleation and photoirradiation growth of CeO_(2) thin films have been studied.Cyclic voltammetry,chronoamperometry and scanning electron microscopy were used to analyze the nucleation process of CeO_(2) thin films deposited on the anode with photo irradiation.Experimental results show that the anodic deposition process with photo illumination is controlled by diffusion.Compared with the dark state,photo illumination mainly contributed to increase the current density of the three-dimensional nucleation process,because photo illumination is helpful to create active sites and accelerate the nucleation progress on the surface that a thin ceria film has been formed.Two-dimensional nucleation process mainly exists within the initial 2 s,and then only three-dimensional instantaneous nucleation process continues,which may be the main reason why the thickness of the CeO_(2) film can continue to grow with photo illumination but not in the dark state.Increasing the deposition overpotential can promote two-dimensional nucleation and growth rate,whilst when the potential exceeds 0.65 V,three-dimensional current density decreases.The limiting factor at that time may be the diffusion rate of cerium ions in the solution towards the electrode substrate.
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