Journal
NANO RESEARCH
Volume 13, Issue 8, Pages 2063-2071Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-2808-7
Keywords
hydrogen storage; Mg hydride; catalyst; synergetic effect; MoNi alloy
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Catalysts play a critical role in improving the hydrogen storage kinetics in Mg/MgH(2)system. Exploring highly efficient catalysts and catalyst design principles are hot topics but challenging. The catalytic activity of metallic elements on dehydrogenation kinetics generally follows a sequence of Ti>Nb>Ni>V>Co>Mo. Herein, we report a highly efficient alloy catalyst composed of low-active elements of Mo and Ni (i.e. MoNi alloy) for MgH(2)particles. MoNi alloy nanoparticles show excellent catalytic effect, even outperforming most advanced Ti-based catalysts. The synergy between Mo and Ni elements can promote the break of Mg-H bonds and the dissociation of hydrogen molecules, thus significantly improves the kinetics of Mg/MgH(2)system. The MoNi-catalyzed Mg/MgH(2)system can absorb and release 6.7 wt.% hydrogen within 60 s and 10 min at 300 degrees C, respectively, and exhibits excellent cycling stability and low-temperature hydrogen storage performance. This study provides a strategy for designing efficient catalysts for hydrogen storage materials using the synergy of metal elements.
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