首页|Synthesis of highly stable Ni nanoparticles via electrostatic self-assembly for enhanced hydrogen storage of MgH2

Synthesis of highly stable Ni nanoparticles via electrostatic self-assembly for enhanced hydrogen storage of MgH2

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Magnesium-based hydrides have been widely recognized as an appropriate choice for solid-state hydro-gen storage.However,its undesirable thermodynamics and sluggish hydrogenation/dehydrogenation kinetics are major bottlenecks for its application.Herein,a highly stable and highly dispersed Ni-based catalyst(Ni/Al2O3/GN)was fabricated to promote the hydrogen storage performance of MgH2 via the electrostatic effect of NiAl-LDH/GN pre-cursor with a co-calcination reduction process.MgH2-5 wt％Ni/Al2O3/GN exhibits excellent hydrogen storage performance,releasing about 5.7 wt％hydrogen in 3500 s at 250 ℃,and can reach a saturation hydrogen absorption of about 6.15 wt％in 3000 s at 100 ℃.Furthermore,it also shows low dehydrogenation apparent activation energy of 89.1 and 118.2 kJ·mol-1.Impressively,the catalyst ensures the stability of both the physical phase and structure during ball milling and cycling process.The role of each phase in Ni/Al2O3/GN on the hydrogen storage performance of MgH2 was also discussed through experiments and theo-retical calculation,and the synergistic catalytic mechanism of Ni/Al2O3/GN was clearly elaborated.This work pro-vides a unique perspective for the preparation of highly stable and highly dispersible catalysts.

Magnesium hydrideNi/Al2O3/GNHydrogen storage performanceCatalytic mechanism

Qin-Ke Tang、Jiang-Chuan Liu、Rui Shi、Yun-Feng Zhu、Ji-Guang Zhang、Ya-Na Liu、Jun Wang、Yao Zhang、Xiao-Hui Hu、Zhi-Bin Liu、Li-Quan Li

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College of Materials Science and Engineering,Jiangsu Collaborative Innovation Centre for Advanced Inorganic Function Composites,Nanjing Tech University,Nanjing 211816,China

School of Materials Science and Engineering,Southeast University,Nanjing 211189,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaPostgraduate Research Practice Innovation Program of Jiangsu ProvinceChina Postdoctoral Science FoundationJiangsu Funding Program for Excellent Postdoctoral TalentPriority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions

5207117752171214U2330111KYCX22-12892023M7316372023ZB102

2024

10.1007/s12598-024-02720-x

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(9)
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