Catalytic Effect of Multi-Wall Carbon Nanotubes Supported Nickel on Hydrogen Storage Properties of Mg₉₉Ni Prepared by Hydriding Combustion Synthesis

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  • Wei Lingjun
    College of Materials Science and Engineering, Nanjing Tech University School of Mechanical Engineering, Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangnan University
  • Cui Zhengwei
    School of Mechanical Engineering, Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangnan University
  • Zhu Yunfeng
    College of Materials Science and Engineering, Nanjing Tech University
  • Li Liquan
    College of Materials Science and Engineering, Nanjing Tech University

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  • Catalytic Effect of Multi-Wall Carbon Nanotubes Supported Nickel on Hydrogen Storage Properties of Mg<sub>99</sub>Ni Prepared by Hydriding Combustion Synthesis

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Multi-wall carbon nanotubes supported nickel (Nano-nickel/MWCNT) is added to the hydriding combustion synthesis (HCS) product of Mg99Ni by mechanical milling to yield a designed composite for improving the hydrogen storage properties of magnesium. It is revealed that there is a synergistic effect of nano-Mg2NiH4 and MWCNT on the hydrogen storage properties of Mg99Ni, which improves the hydrogenation and dehydrogenation performance when compared to adding either nano-Ni or MWCNT alone. The composite requires only 80 s to reach its saturated hydrogen capacity of 6.79 mass% at 373 K and desorbs 97.2% hydrogen within 1800 s at 543 K. The dehydrogenation activation energy of this system is 105 kJ mol−1, which is much lower than that of as-received MgH2 (153 kJ mol−1). In addition, the composite preserves stable hydrogen storage capacity and kinetics in the hydrogenation/dehydrogenation cycles at 423 K.

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