Study on catalytic effect and mechanism of MOF (MOF = ZIF-8, ZIF-67, MOF-74) on hydrogen storage properties of magnesium |
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| Affiliation: | 1. School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;2. Siyang Diesel Engine Manufacturing Co., Ltd, Zhenjiang 212003, China;3. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;4. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China |
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| Abstract: | Using a deposition-reduction method, Mg/MOF nanocomposites were prepared as composites of Mg and metal-organic framework materials (MOFs = ZIF-8, ZIF-67 and MOF-74). The addition of MOFs can enhance the hydrogen storage properties of Mg. For example, within 5000 s, 0.6 wt%, 1.2 wt%, 2.7 wt%, 3.7 wt% of hydrogen were released from Mg, Mg/MOF-74, Mg/ZIF-8, Mg/ZIF-67, respectively. Activation energy values of 198.9 kJ mol?1 H2, 161.7 kJ mol?1 H2, 192.1 kJ mol?1 H2 were determined for the Mg/ZIF-8, Mg/ZIF-67, Mg/MOF-74 hydrides, which are 6 kJ mol?1 H2, 43.2 kJ mol?1 H2, and 12.8 kJ mol?1 H2 lower than that of Mg hydride, respectively. Moreover, the cyclic stability characterizing Mg hydride was significantly improved when adding ZIF-67. The hydrogen storage capacity of the Mg/ZIF-67 nanocomposite remained unchanged, even after 100 cycles of hydrogenation/dehydrogenation. This excellent cyclic stability may have resulted from the core-shell structure of the Mg/ZIF-67 nanocomposite. |
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| Keywords: | Magnesium Metal-organic framework Hydrogen storage property |
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