泡沫镍基镍硫合金涂层形貌、结构和析氢性能研究

功能材料, 2006, 37(1): 87-91.

泡沫镍基镍硫合金涂层形貌、结构和析氢性能研究

何捍卫 ^1, , 刘红江 ^2, , 刘芳 ^3, , 周科朝 ^4,

1.中南大学,粉末冶金国家重点实验室,湖南,长沙,410083

2.中南大学,粉末冶金国家重点实验室,湖南,长沙,410083

3.中南大学,粉末冶金国家重点实验室,湖南,长沙,410083

4.中南大学,粉末冶金国家重点实验室,湖南,长沙,410083

基金项目: 国家科技攻关项目(2003AA305980)

关键词：镍硫涂层 , 电沉积 , 镍泡沫 , 析氢电极

Study on micro-appearance, structure and properties of hydrogen evolution reaction of nickel-sulphur alloy coatings electrodeposited on the nickel foam substrate

在含有柠檬酸、硫脲和少许糖精的Watt镀液中,用电沉积的方法在镍泡沫基体上制备了镍硫合金涂层.各层涂层的形貌用SEM分析,各层硫量的分布用EDX测量.第1层涂层的结构用XRD测定.对各种电极包括镍泡沫基、镍网基上镍硫涂层电极,空白镍泡沫、镍网电极等的极氢电位进行了测量,研究了不同温度下镍泡沫基镍硫涂层电极的析氢活性.结果表明,镍泡沫基Ni-S涂层电极的析氢活性比镍网基Ni-S涂层电极活性高得多.镍泡沫各层硫量呈梯度的分布规律,由表及里硫含量逐步降低,中心层硫含量最低.各层表面微细颗粒大小及其均一性不相同,第1层的颗粒尺寸大于其它层的颗粒,其大小均一性也较其它层差.镍硫涂层是镍和Ni3S2组成的非晶态,使涂层具有丰富的表面积和氢气析出反应的活性中心.在加热的电解液中,在60℃以下和60℃以上的温区内电极析氢反应的机制不完全一样,受温度影响的程度也不一样.4000A/m2、90℃时,这种电极的析氢电位比15℃时析氢电位低180mV.

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