Abstract
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.
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