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 ele...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.展开更多
The Ni-W gradient deposit with nano-structure was prepared by an electrochemical deposition method.X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDXA) indicate that the crystallite size of the deposit ...The Ni-W gradient deposit with nano-structure was prepared by an electrochemical deposition method.X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDXA) indicate that the crystallite size of the deposit decreases from 10.3nm to 1.5nm and the crystal grating aberrance increases with the increase of W content in the growing direction of the deposit. The structure of deposit changes from crystalline to amorphous stepwise with associated increase of crystal grating aberrance, and presents gradient distribution. These show that the deposit isgradient with nano-structure.展开更多
基金financial support from the Science and Technology Project of Hunan Province,China(No.2018TP1012)。
文摘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.
基金Supported by the National Natural Science Foundation of China (No.59671058)
文摘The Ni-W gradient deposit with nano-structure was prepared by an electrochemical deposition method.X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDXA) indicate that the crystallite size of the deposit decreases from 10.3nm to 1.5nm and the crystal grating aberrance increases with the increase of W content in the growing direction of the deposit. The structure of deposit changes from crystalline to amorphous stepwise with associated increase of crystal grating aberrance, and presents gradient distribution. These show that the deposit isgradient with nano-structure.
