How to Analyse Metal Hydride Decomposition Temperatures Using a Sieverts’ Type Hydriding-Dehydriding Apparatus and Hydrogen-Storage Characteristics for an MgH2–Based Alloy
In this work, a method to analyze metal hydride decomposition temperatures (the onset temperature of the metal hydride decomposition and the temperature for the maximum ratio of released gas quantity change with temperature change), of prepared samples were investigated using a Sieverts’ type hydrid...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Kaunas University of Technology
2018-02-01
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| Series: | Medžiagotyra |
| Subjects: | |
| Online Access: | http://matsc.ktu.lt/index.php/MatSc/article/view/17664 |
| Summary: | In this work, a method to analyze metal hydride decomposition temperatures (the onset temperature of the metal hydride decomposition and the temperature for the maximum ratio of released gas quantity change with temperature change), of prepared samples were investigated using a Sieverts’ type hydriding-dehydriding apparatus, in which a back-pressure regulator was employed. The quantity of the gas released under 1.0 bar H<sub>2</sub> was measured as the temperature was increased with a heating rate of 4 K/min. The variation in the ratio of released hydrogen quantity <em>H</em><sub>d</sub> change with temperature <em>T</em> change, d<em>H</em><sub>d</sub>/d<em>T</em>, as a function of temperature was obtained and from the variation in d<em>H</em><sub>d</sub>/d<em>T</em> with <em>T</em>, the metal hydride decomposition temperatures were analyzed. This analysis method can be used instead of thermal analysis methods such as thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) analysis, differential thermal analysis (DTA), and thermal desorption spectroscopy (TDS) analysis. For this analysis, a sample with a composition of 89 wt.% MgH<sub>2 </sub>+ 4.9 wt.% Ni + 1.7 wt.% Zn(BH<sub>4</sub>)<sub>2 </sub>+ 1.0 wt% NaCl + 1.7 wt.% Ti + 1.7 wt % Fe (named MgH<sub>2</sub>-Ni-Zn(BH<sub>4</sub>)<sub>2</sub>-NaCl-Ti-Fe) sample was prepared by planetary ball milling. In the prepared MgH<sub>2</sub>-Ni-Zn(BH<sub>4</sub>)<sub>2</sub>-NaCl-Ti-Fe sample, it is believed that MgH<sub>2</sub> begins to decompose at about 575 K and dH<sub>d</sub>/dT reaches its peak at about 610 K.<p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.24.1.17664">http://dx.doi.org/10.5755/j01.ms.24.1.17664</a></p> |
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| ISSN: | 1392-1320 2029-7289 |