摘要
在（25±2）°C下,从含有50g/LRuCl3·nH2O、30.0g/L乙酸钠、30.0g/L二水合柠檬酸钠和15.0-50.0g/LNiSO4·6H2O的溶液（pH3.0）中,以10-90mA/cm2在铜基底上电沉积制备了Ru含量为5%-70%（原子分数）的Ni–Ru合金。采用X射线衍射（XRD）、扫描电子显微镜（SEM）和电化学方法,研究了镀液中NiSO4质量浓度和电流密度对沉积层组成、表面形貌、结构及电催化析氢活性的影响。结果表明,溶液中Ru优先析出并能促进Ni的沉积,镀层中Ru含量随着镀液中Ni2＋质量浓度的提高而降低,低电流密度有利于获得Ru含量高的镀层。随着镀液中Ni2＋质量浓度的降低或电流密度的提高,镀层表面形貌由较为平整、均匀变为多孔的颗粒状。镀层主要呈现面心立方Ni结构特征,且晶粒尺寸随镀层中Ru含量的增加而变小。Ni–Ru合金电极的析氢活性优于纯Ni,当镀层的Ru原子分数超过15%时,其析氢活性与纯Ru电极接近。
Ni-Ru alloys with 5% - 70% （atomic fraction） Ru were electrodeposited on Cu substrate from a bath （pH 3.0） containing 50 g/L RuCl3@·nH2O, 30.0 g/L CH3COONa, 30.0 g/L Na3C6H5O7· 2H2O, 15.0 - 50.0 g/L NiSO4· 6H2O at （25±2） ℃ and 10 -90 mA/cm^2. The effects of the mass concentration of NiSO4 in the electrolyte and current density on the composition, surface morphology, microstructure and hydrogen evolution electrocatalytic activity of the Ni-Ru alloys were studied by scanning electron microscopy （SEM）, X-ray diffraction （XRD） and electrochemical methods. The results showed that the content of Ru in the deposits are increased with decreasing mass concentration of NiSO4 in the electrolytes and low current density is favorable to obtain a deposit with high Ru content. SEM results revealed that the surface morphology of Ni-Ru alloy deposit is changed from uniform and smooth to granular and porous appearance with decreasing mass concentration of NiSO4 or increasing current density. XRD patterns of the deposit display mainly the （111） structure characteristics of the face-centered cubic OCcc） Ni alloy crystal structure, and the size of crystal grains is decreased with increasing Ru content in deposit. The cathodic polarization curves showed that the activity of Ni-Ru deposit for hydrogen evolution reaction in 1.0 mol/L NaOH is superior to that of pure Ni, and even similar to that of pure Ru when the atomic fraction of Ru in deposit is more than 15%.
出处
《电镀与涂饰》
CAS
CSCD
2007年第8期10-13,共4页
Electroplating & Finishing
基金
浙江省自然科学基金资助课题(Y404028)
关键词
Ni-Ru合金
电沉积
表面形貌
微观结构
极化曲线
析氢
电催化
nickel-ruthenium alloy
electrodeposition
surface morphology
microstructure
polarization curve
hydrogen evolution
electrocatalysis
