Nanostructuring and catalyzing are effective methods for improving the hydrogen storage properties of MgH₂. In this work, transition-metal-carbides (TiC, ZrC and WC) are introduced into Mg–Ni alloy to enhance its hydrogen storage performance. 5 wt% transition-metal-carbide containing Mg₉₅Ni₅ (atomic ratio) nanocomposites are prepared by mechanical milling pretreatment followed by hydriding combustion synthesis and mechanical milling process, and the synergetic enhancement effects of Mg₂NiH₄ and transition-metal-carbides are investigated systematically. Due to the inductive effect of Mg₂NiH₄ and charge transfer effect between Mg/MgH₂ and transition-metal-carbides, Mg₉₅Ni₅-5 wt.% transition-metal-carbide samples all exhibit excellent hydrogen storage kinetic at moderate temperature and start to release hydrogen around 216 °C. Among them, 2.5 wt% H₂ (220 °C) and 4.7 wt% H₂ (250 °C) can be released from the Mg₉₅Ni₅-5 wt.% TiC sample within 1800 s. The unique mosaic structure endows the Mg₉₅Ni₅-5 wt.% TiC with excellent structural stability, thus can reach 95% of saturated hydrogen capacity within 120 s even after 10 cycles of de-/hydrogenation at 275 °C. And the probable synergistic enhancement mechanism for hydrogenation and dehydrogenation is proposed.

纳米结构化和催化是提高MgH ₂储氢性能的有效方法。在这项工作中，将过渡金属碳化物（TiC，ZrC和WC）引入Mg-Ni合金中，以增强其储氢性能。通过机械研磨预处理，然后氢化燃烧合成和机械研磨工艺，制备了含Mg ₉₅ Ni ₅（原子比）纳米复合材料的5 wt％过渡金属碳化物，以及Mg ₂ NiH ₄和过渡金属碳化物的协同增强作用。被系统地调查。由于Mg ₂ NiH ₄的感应效应和Mg / MgH ₂之间的电荷转移效应和过渡金属碳化物，Mg ₉₅ Ni ₅ -5 wt。％过渡金属碳化物样品在中等温度下均表现出优异的储氢动力学，并在216°C附近开始释放氢。其中，可以在1800 s的时间内从Mg ₉₅ Ni ₅ -5 wt。％TiC样品中释放出2.5 wt％的H ₂（220°C）和4.7 wt％的H ₂（250°C）。独特的镶嵌结构使Mg ₉₅ Ni ₅ -5 wt。％TiC具有出色的结构稳定性，因此即使在275°C进行10次脱氢/加氢循环后，也可以在120 s内达到95％的饱和氢容量。并提出了可能的加氢和脱氢协同增效机理。