Nucleation and growth mechanism of electrodeposited Ni−W alloy  

电沉积镍钨合金的成核与生长机理

作　　者：Meng-chao YE Ting-ting DING Hao ZHOU Feng-jiao HE 叶猛超;丁婷婷;周浩;何凤姣(湖南大学化学化工学院,长沙410082;湖南大学化学生物传感与计量学国家重点实验室,长沙410082)

机构地区：[1]College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,China [2]State Key Laboratory of Chemo/Biosensing and Chemometrics,Hunan University,Changsha 410082,China

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第6期1842-1852,共11页中国有色金属学报（英文版）

基　　金：financial support from the Science and Technology Project of Hunan Province,China(No.2018TP1012)。

摘　　要：The nucleation and growth mechanism of electrodeposited Ni−W alloy were investigated.Cyclic voltammetry(CV)and chronoamperometry(CA)were used to examine the electrochemical behavior and nucleation mechanism of the electrodeposited Ni−W alloy.The nucleation type and kinetic parameters of the electrodeposited Ni−W alloy were obtained from the CA analysis results.SEM,AFM,and TEM were also used to investigate the nucleation and growth process of the electrodeposition of Ni−W alloy.The results demonstrate that the nucleation and initial stages of the growth phase of the Ni−W alloy undergo the formation,movement,and aggregation of atoms,single crystals,and nanoclusters.When the size of single crystal increases up to approximately 10 nm and the average size of the crystal granules is approximately 68 nm,they no longer grow.Increasing the applied potential increases the number of nuclei but does not affect the size of the final crystal granules.Therefore,the electrodeposited Ni−W alloy shows a nanocrystalline structure.研究电沉积镍钨合金的成核与生长机理。采用循环伏安法和计时电流法研究电沉积镍钨合金的电化学行为和成核机理。从计时电流法得到的结果可以得到电沉积镍钨合金的成核模型和动力学参数。同时,采用扫描电子显微镜、原子力显微镜和透射电子显微镜研究电沉积镍钨合金的成核与生长过程。结果发现,镍钨合金的成核与早期生长阶段经历原子、单晶和纳米团簇的形成、移动和聚集过程。当单晶尺寸长到10 nm左右和晶体颗粒平均尺寸长到68 nm左右后,都不再长大。随着施加电位增大,晶核数目增加,但不影响最终晶体颗粒的尺寸。因此,电沉积的镍钨合金具有纳米晶结构。

关 键 词：Ni−W alloy ELECTRODEPOSITION NUCLEATION growth NANO-CRYSTALLINE 

分 类 号：TQ153.2[化学工程—电化学工业]