脉冲电沉积制备非晶态Ni-Mo合金及析氢性能

电解水产氢具有原材料来源丰富、生产过程清洁、效率较高的优势,已经成为广泛研究的技术之一.通过脉冲电沉积技术,在不同的电流密度和占空比下,制备了不同的非晶态Ni-Mo合金镀层,研究了电流密度和占空比对镀层性能的影响.结果表明:随着占空比和电流密度的增大Mo含量减小,表面更加粗糙,在电流密度为2.5 A·dm^－2和占空比0.8下,可获得表面极为粗糙的非晶态Ni-Mo合金镀层,另外,占空比为0.6和电流密度为2.0 A·dm^－2下获得晶粒尺寸较小的合金镀层.粗糙表面结构的Ni-Mo合金在较大的过电位下表现出更好的析氢催化性能,而具有较高Mo含量和细小晶粒尺寸的合金镀层析氢催化活性较高.

Preparation of amorphous Ni-Mo alloy by pulse electrodeposition and its hydrogen evolution properties

Electrolytic aquatic hydrogen is one of the widely technologies to product hydrogen because of the advantages of abundant raw materials, clean production process and high efficiency. The different amorphous Ni-Mo alloy coatings were prepared by pulse electrodeposition under different current density and duty cycle, and the effects of current density and duty cycle on the properties of the coating were studied. The results showed that the Mo content is decreased and the surface become the rougher with the increase of the duty cycle and the current density, and the amorphous Ni-Mo alloy coating with very rough surface can be obtained under the current density of 2.5A·dm^－2 and the duty cycle of 0.8. In addition, the alloy coating possessed smaller grain size is prepared under the duty cycle of 0.6 and the current density of 2.0 A·dm^－2. The Ni-Mo alloy with the rough surface show better catalytic performance for hydrogen evolution under the large overpotential, and the alloy coating with the high Mo content and the fine grain size has good catalytic activity for hydrogen evolution.