Trimesic acid-Ni based metal organic framework derivative as an effective destabilizer to improve hydrogen storage properties of MgH2
| Autor: | Jianxin Zou, Zhewen Ma, Jisheng Yang, Kemin Zhang, Tianping Huang, Subrata Panda, Xu Zhang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment Enthalpy Composite number Energy Engineering and Power Technology chemistry.chemical_element Condensed Matter Physics Hydrogen storage chemistry.chemical_compound Fuel Technology chemistry Chemical engineering Desorption Dehydrogenation Metal-organic framework Trimesic acid |
| Zdroj: | International Journal of Hydrogen Energy. 46:28134-28143 |
| ISSN: | 0360-3199 |
| Popis: | Herein, a new type of trimesic acid-Ni based metal organic framework (TMA-Ni MOF) was synthesized and then, its derivative Ni@C was introduced into MgH2 as destabilizer through high energy ball milling to prepare a Mg–Ni@C–H composite. X-ray diffraction analyses indicate the formation of Mg2Ni/Mg2NiH4 as major phases after dehydrogenation/rehydrogenation of the composite, respectively. Two hydrogen absorption plateaus are observed in the Mg–Ni@C–H composite, corresponding to the hydrogenation of Mg and Mg2Ni, with the enthalpy change values of −75.8 and −52.3 kJ mol−1 H2 respectively. Thus, it can be concluded that a destabilization effect is brought by Ni@C on thermodynamic properties of MgH2. In addition, the hydriding/dehydriding kinetics of MgH2 is notably accelerated with the addition of Ni-based MOF derivative. The activation energy values of both hydrogen absorption and desorption are significantly lowered down with the assistance of Ni@C. Moreover, stable hydrogen de/absorption capacity and kinetics are remained during 25 cycles of high-rate re/dehydrogenation, which can be ascribed to the carbon-wrapped structure of the composite, with which the aggregation of the nanosized particles can be evidently avioded. |
| Databáze: | OpenAIRE |
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