Synergistic effects of transition metal halides and activated carbon nanofibers on kinetics and reversibility of MgH2
| Autor: | Puttimate Thongtan, Sophida Thiangviriya, Dechmongkhon Kaewsuwan, Rapee Utke, Palmarin Dansirima, Praphatsorn Plerdsranoy, Narong Chanlek |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Hydrogen chemistry.chemical_element Halide 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Catalysis Hydrogen storage Transition metal Chemical engineering chemistry medicine General Materials Science Dehydrogenation 0210 nano-technology Carbon Activated carbon medicine.drug |
| Zdroj: | Journal of Physics and Chemistry of Solids. 124:81-88 |
| ISSN: | 0022-3697 |
| Popis: | MgH2 doped with transition metal halides (TiF4, NbF5, and ZrCl4) and activated carbon nanofibers (ACNF) for reversible hydrogen storage is prepared by ball milling technique. Transition metal halides provide catalytic effects for de/rehydrogenation kinetics, while ACNF benefits thermal conductivity and hydrogen permeability as well as prevents particle agglomeration during cycling. Significant reduction of onset and main dehydrogenation temperatures of MgH2 (ΔT = 243 and 158 °C, respectively) are achieved by doping with 5–10 wt % of NbF5, ACNF-TiF4 and ACNF-NbF5. During the 1st cycle, the latter samples liberate 4.7–5.0 wt % H2 within 1 h 30 min, whereas MgH2 doped with ACNF reaches only 1.5 wt % H2. The reaction between MgF2 and NbHx (x |
| Databáze: | OpenAIRE |
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