Research Article

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2020, 13(8): 2063–2071

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https://doi.org/10.1007/s12274-020-2808-7

Synergy between metallic components of MoNi alloy for catalyzing highly efficient hydrogen storage of MgH2

Meng Chen1,2,§, Yanhui Pu1,§, Zhenyang Li1, Gang Huang1, Xiaofang Liu1 (✉), Yao Lu1, Wukui Tang1, Li Xu3, Shuangyu Liu3, Ronghai Yu1 (✉), and Jianglan Shui1 (✉)

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1 School of Materials Science and Engineering, Beihang University, Beijing 100191, China
2 Beijing Key Laboratory of Civil Aircraft Structures and Composite Material, COMAC Beijing Aircraft Technology Research Institute, Beijing 102211, China
3 Material Laboratory of State Grid Corporation of China, Global Energy Interconnection Research Institute Beijing, Beijing 102211, China
§ Meng Chen and Yanhui Pu contributed equally to this work.

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/MgH2 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 MgH2 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/MgH2 system. The MoNi-catalyzed Mg/MgH2 system can absorb and release 6.7 wt.% hydrogen within 60 s and 10 min at 300 oC, 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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Synergy between metallic components of MoNi alloy for catalyzing highly efficient hydrogen storage of MgH2. Nano Res. 2020, 13(8): 2063–2071 https://doi.org/10.1007/s12274-020-2808-7

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