氨络合物体系中镍在玻璃碳上电化学成核机理.pdfVIP

第2 1卷 　第6 期 材 　料 　科 　学 　与 　工 　程 　学 　报 总第8 6 期 Vol 2 1 　No 6 Journal of Materials Science Engineering Dec . 2 0 0 3 文章编号 :1004793X( 2003) 氨络合物体系中镍在玻璃碳上的电化学成核机理 郑利峰 ,郑国渠 ,曹华珍 ,张九渊 ( 浙江工业大学材料科学与工程研究所 ,浙江 杭州 　310014) 　　【摘 　要】　采用循环伏安法和计时电流法研究了氨络合物体系中镍在玻璃碳上电结晶的初期行为 。结果表 明 ,镍在该基体上的沉积没有经历 UPD 过程 ,镍的电沉积经历了晶核形成过程 ,在所研究的外加电位范围内其电 结晶按连续成核和三维生长方式进行 ,外加电位对晶体生长具有显著的影响 。通过分析恒电位暂态曲线 ,求出镍 离子的扩散系数 D , 以及不同外加电位下的饱和晶核数密度 N sat ,探讨了外加电位对成核作用的影响 。 【关键词】　镍电沉积 ; 电结晶;氨络合物 ,成核 中图分类号 :TQ 53 　　　　文献标识码 :A Electrochemical Nucleation of Nickel on Vitreous Carbon in Leaching Solution Containing Ammonia and Chloride ZHENG Lifeng , ZHENG Guoqu , CAO Huazhen , ZHANG Jiuyuan ( Department of materials science and engineering ,zhejiang university of technology , Hangzhou 　310014 , China) 【Abstract 】　Initial stages of electrocrystallization of nickel on vitreous carbon from a leaching solution containing ammonia and chloride were investigated by means of cyclic voltammetric and chronoamperometric technique . The results show that the deposition of nickel on the substrate did not undergo UPD process ,but undergoes nucleation process. In the experimental conditions ,the electrocrystallization of nickel follows the mechanism of three dimensional progressive nucleation and growth . By analyzing of the potentiostatic transients , the diffusion coefficient D of the depositing nickel ions and saturated nuclear number density Nsat were estimated ,the effects of applied potential on nucleation and growth were also discussed. 【Key words】　nickel electrodeposition ; electrocrystallization ; nucleation ; ammon