Effect of multi-wall carbon nanotubes supported nano-nickel and TiF3 addition on hydrogen storage properties of magnesium hydride
| Autor: | Liquan Li, Jiguang Zhang, Yang Yang, Yana Liu, Yunfeng Zhu, Wei Su, Qifeng Mao |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Hydrogen Mechanical Engineering Inorganic chemistry Magnesium hydride Metals and Alloys chemistry.chemical_element 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis law.invention Hydrogen storage Nickel chemistry.chemical_compound chemistry Mechanics of Materials law Desorption Materials Chemistry Dehydrogenation 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 669:8-18 |
| ISSN: | 0925-8388 |
| Popis: | Multi-wall carbon nanotubes supported nano-nickel (Ni/MWCNTs) with superior catalytic effects was introduced to magnesium hydride by the process of hydriding combustion synthesis (HCS) and mechanical milling (MM). The effect of different Ni/MWCNTs contents (5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%) on the hydrogenation and dehydrogenation properties of the composite was investigated systematically. It is revealed that Mg85-(Ni/MWCNTs)15 composite shows the best comprehensive hydrogen storage properties, which absorbs 5.68 wt.% hydrogen within 100 s at 373 K and releases 4.31 wt.% hydrogen within 1800 s at 523 K under initial hydrogen pressures of 3.0 and 0.005 MPa, respectively. The in situ formed nano-Mg2Ni and MWCNTs have excellent catalytic effect on the hydrogenation and dehydrogenation performances of MgH2. To further improve the hydrogen absorption/desorption properties, TiF3 was added to the Mg–Ni/MWCNTs system. The result shows that TiF3 addition has little influence on the thermodynamic performance, but affects greatly the kinetic properties. The Mg85-(Ni/MWCNTs)15-TiF3 composite exhibits an appreciably enhanced hydrogen desorption performance at low temperature, and the hydrogen desorption capacity within 1800 s at 473 K for the TiF3-added composite is approximately four times the capacity of Mg85-(Ni/MWCNTs)15 under the same condition. The catalytic effects during hydrogenation and dehydrogenation have been discussed in the study. |
| Databáze: | OpenAIRE |
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