Synergistic catalytic effects of ZIF-67 and transition metals (Ni,Cu, Pd,and Nb) on hydrogen storage properties of magnesium |
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| Affiliation: | 1. Center on Nanoenergy Research, School of Physical Science and Technology, Guangxi University, Nanning 530004, PR China;2. School of Physics, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian 116024, PR China;3. Department of Mechanical Engineering, Iowa State University, 271 Applied Science Complex II, Ames, IA 50011, USA |
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| Abstract: | MgTM/ZIF-67 nanocomposites were prepared by the deposition-reduction method using ZIF-67, MgCl2, and TMClx (TM = Ni, Cu, Pd, Nb) as raw materials. The dehydrogenation activation energies of MgTM/ZIF-67 (TM = Ni, Cu, Pd, Nb) nanocomposites were calculated to be 115.4 kJ mol?1 H2, 115.7 kJ mol?1 H2, 113.6 kJ mol?1 H2, and 75.8 kJ mol?1 H2, respectively; hence, the MgNb/ZIF-67 nanocomposite manifested the best comprehensive hydrogen storage performance. The hydrogen storage capacity of the MgNb/ZIF-67 nanocomposite was hardly attenuated after the 100th hydrogen absorption-desorption cycle. The dehydrogenated enthalpies of MgH2 and CoMg2H5 in MgNb/ZIF-67 hydride were calculated to be 72.4 kJ mol?1 H2 and 81.0 kJ mol?1 H2, respectively, which were lower than those of additive-free MgH2 and Mg/ZIF-67. The improved hydrogen storage properties of MgNb/ZIF-67 can be ascribed to the CoMg2–Mg(Nb) core-shell structure and the catalytic effects of NbH and niobium oxide nanocrystals. |
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| Keywords: | Magnesium Hydrogen storage properties Transition metals Cycling stability |
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