为了研究镍磷纳米颗粒(Ni?P)的晶化对其催化析氢性能的影响,利用自催化还原反应及热处理工艺制备非晶Ni?P纳米颗粒及晶态Ni12P5.通过对样品进行电催化析氢性能分析,发现晶化的Ni12P5与晶化前的Ni?P相比,其催化析氢性能有了极大的提升.X射线衍射、透射电子显微镜及X射线光电子能谱分析结果表明,Ni12P5中形成了Ni?P键,使其中的Ni、P分别带有微弱的正、负电荷,[NiFe]氢化酶及其同系物的这种性质类似,会减少析氢过程中氢气脱离的能量消耗,Ni12P5的高效催化析氢性能可能与此有关.
In order to investigate the effect of nickel phosphide nanoparticles' (Ni?P NPs) crystallization on hydrogen evolution reaction (HER) catalytic performance, amorphous Ni?P NPs and crystalline Ni12P5 were synthesized by a simple and low-cost autocatalytic reduction method and heat treatment process. The result of electrochemical tests shows that crystalline Ni12P5 has much higher HER catalytic activity than the amorphous one. X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy revealed that Ni?P bond formed during crystallization, making Ni positively charged and P negatively charged. This charged nature of Ni12P5 is similar to [NiFe] hydrogenase and its analogous, which make the removal of H2 less energy-cost.
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