To illuminate the effects of eutectic structure on the de-/hydrogenation properties of Mg-based alloy, Mg-9Ni, Mg-12Cu and Mg-6Ni-3Cu (at. %) alloys with nearly the same primary Mg proportion are prepared. Mg₂Ni and Mg₂Cu respectively form a eutectic structure with Mg and tunable eutectic is obtained via Cu partial substituting Ni. Mg-6Ni-3Cu alloy shows excellent activation performance and rapid absorption rates without any sacrifice of desorption rates, leading to a maximum hydrogen capacity of 6.5 wt% H₂ under 300 °C 3 MPa. Different from the independent de-/hydriding behavior of Mg->12Cu alloy, Mg-6Ni-3Cu alloy shows perfectly wide pressure-composition-isotherm plateau with minimal slope. The dehydrogenation models of experimental hydrides are determined. Owing to Cu substitution, the dehydrogenation activation energy reduces from 95.82 to 67.34 kJ mol⁻¹ H₂, the onset/peak desorption temperature also reduces significantly. It is the spatial connected eutectic and its increased boundaries that facilitate the activation and H diffusion process, which greatly compensate the negative impacts of reduced hydrogenation driving force caused by Mg₂Cu. The rapid H diffusion coupled with the increased dehydrogenation driving force collectively facilitates its dehydriding process.

为了阐明共晶结构对Mg基合金的脱氢/加氢性能的影响，制备了具有几乎相同的主Mg比例的Mg-9Ni，Mg-12Cu和Mg-6Ni-3Cu（原子％）合金。Mg ₂ Ni和Mg ₂ Cu分别与Mg形成共晶结构，并且通过Cu部分替代Ni获得可调谐的共晶。Mg-6Ni-3Cu合金具有出色的活化性能和快速吸收速率，而不会牺牲任何解吸速率，从而导致最大氢容量为6.5 wt％H ₂在300°C下3 MPa。与Mg-> 12Cu合金的独立脱/氢化行为不同，Mg-6Ni-3Cu合金表现出非常宽的压力组成-等温线平稳区，斜率最小。确定了实验氢化物的脱氢模型。由于Cu的取代，脱氢活化能从95.82降低至67.34kJ mol ^-1 H ₂，起始/峰解吸温度也显着降低。是空间连接的共晶及其增加的边界，促进了活化和氢扩散过程，极大地补偿了由Mg ₂引起的加氢驱动力降低带来的负面影响。铜 快速的H扩散和增加的脱氢驱动力共同促进了其脱水过程。