Ni-S合金析氢阴极的制备研究

以硫脲作为硫源,在改进的瓦特镀液体系中用电沉积方法获得N i-S合金镀层,系统地研究了硫脲浓度、电流密度、电沉积时间、镀液温度、pH值、有机添加剂等实验条件对N i-S合金电极析氢活性的影响.用重量分析法测定电沉积层中硫的含量,X-射线衍射技术表征镀层的晶形结构,稳态恒流极化法研究N i-S合金层的电催化活性.实验结果表明,电沉积得到的析氢活性较好的镍硫合金为非晶态结构和弱晶结构,硫含量为11.59%(重量比)时,N i-S合金电极具有优良的电催化性能,且在长期电解条件下电极仍有良好的析氢活性.

Study on Preparation of Ni-S Alloys as Hydrogen Evolution Reaction Cathodes

The coating of nickel-sulfur alloys was obtained by electrodeposition method in a modified Watts bath with thiourea as the sulfur source.The effects of experimental conditions,such as concentration of thiourea,current density, electroplating time,temperature,pH,organic additives,on the catalytic activity of Ni-S alloys for hydrogen evolution reaction were systematically studied. The sulfur content in electrodeposition coatings was analyzed by gravimetric method,the structure of Ni-S alloys was characterized by X-ray diffraction technique,and the electrocatalytic activity of nickel-sulfur electrode was measured by constant current steady polarization method.The results show that Ni-S electro deposits which have better HER activity were amorphous,the Ni-S alloy ele ctrode with sulfur content of 11.59 wt% performed excellent electrocatalytic property and lasts good activity for hydrogen evolution reaction during long-term electrolysis.