柠檬酸盐镀液中纳米晶镍沉积机理（英文）  

Mechanism of Nanocrystalline Nickel Electrodeposition from Novel Citrate Bath

作　　者：李超群[1] 李新海[1] 王志兴[1] 郭华军[1] 

机构地区：[1]中南大学,湖南长沙410083

出　　处：《稀有金属材料与工程》2015年第7期1561-1567,共7页Rare Metal Materials and Engineering

基　　金：National Key Basic Research Development Program of China("973"Program)(2007CB613607)

摘　　要：用电化学阻抗谱研究了在柠檬酸盐镀液中纳米晶镍沉积的电化学行为,确认了Ni(Ⅱ)离子是两步放电,其中吸附物Ni(OH)ads是通过第1步产生。通过分析阻抗谱,除了在高频端出现一个容抗弧,在低频端出现的感抗弧,是由于Ni(OH)ads在阴极驰豫过程引起的结果。实验过程中观察到的电化学行为和结果能够通过提出的机理得到解释,中间化合物Ni(OH)ads在电极表面消耗。通过定量分析和模拟,得到了镍沉积过程的阻抗参数。镀液中柠檬酸钠的加入,增加了电荷转移电阻,减小了双电层电容。The electrochemical behavior of nanocrystalline nickel deposition in citrate bath was investigated by electrochemical impedance spectroscopy（EIS）.The two-step discharge of Ni（Ⅱ） cations was confirmed, and an intermediate absorbate Ni（OH）ads originated from the reversible first step.The analysis of the impedance of nickel deposition showed that apart from the capacitive loop at the high frequency due to the double layer, the inductive loop at low-frequency was observed in a citrate bath which is ascribed to the relaxation of the electrode coverage by Ni（OH）ads.The electrochemical behavior observed in the experiment processes and results could be accounted for by the reaction mechanism implying two successive transfer reactions in which Ni（OH）ads acts as an intermediate compound consumed at the electrode.By quantitative analysis and simulation of the results of the cathodic impedance, the impedance parameters of nickel deposition in a bath with or without sodium citrate were obtained.The presence of sodium citrate in the bath increases the charge transfer resistance of nickel deposition and reduces the capacitance of the electrochemical double-layer.

关 键 词：机理 柠檬酸盐镀液 电化学阻抗谱 中间吸附物 镍沉积 

分 类 号：TQ153.12[化学工程—电化学工业]