Characterization of Hydrogen-Storage Properties and Physical Properties of Zinc Borohydride and Transition Metals-Added Magnesium Hydride
<p>In this work, 90 wt.% MgH<sub>2 </sub>+ 5 wt.% Ni + 1.7 wt.% Zn(BH<sub>4</sub>)<sub>2 </sub>+ 1.7 wt.% Ti + 1.7 wt.% Fe samples (named 90MgH<sub>2 </sub>+ 5Ni + 1.7Zn(BH<sub>4</sub>)<sub>2 </sub>+ 1.7Ti + 1.7Fe) were pr...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Kaunas University of Technology
2017-02-01
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| Series: | Medžiagotyra |
| Subjects: | |
| Online Access: | http://matsc.ktu.lt/index.php/MatSc/article/view/14878 |
| Summary: | <p>In this work, 90 wt.% MgH<sub>2 </sub>+ 5 wt.% Ni + 1.7 wt.% Zn(BH<sub>4</sub>)<sub>2 </sub>+ 1.7 wt.% Ti + 1.7 wt.% Fe samples (named 90MgH<sub>2 </sub>+ 5Ni + 1.7Zn(BH<sub>4</sub>)<sub>2 </sub>+ 1.7Ti + 1.7Fe) were prepared by milling in a planetary ball mill in a hydrogen atmosphere. The fraction of additives was small (10 wt.%) in order to increase hydriding and dehydriding rates without decreasing the hydrogen storage capacity much. The hydrogen absorption and release properties of the prepared samples were investigated. 90MgH<sub>2 </sub>+ 5Ni + 1.7Zn(BH<sub>4</sub>)<sub>2 </sub>+ 1.7Ti + 1.7Fe had an effective hydrogen storage capacity of 5 wt.%. The activation of 90MgH<sub>2 </sub>+ 5Ni + 1.7Zn(BH<sub>4</sub>)<sub>2 </sub>+ 1.7Ti + 1.7Fe was completed after 2 hydriding-dehydriding cycles. At <em>n</em> = 3, the sample absorbed 4.14 wt.% H for 5 min and 5.00 wt.% H for 60 min at 593 K under 12 bar H<sub>2</sub>. The sample dehydrided at the 3rd hydriding-dehydriding cycle contained Mg and small amounts of β-MgH<sub>2</sub>, MgO, Mg<sub>2</sub>Ni, TiH<sub>1.924</sub>, and Fe. The BET specific surface areas of the sample after milling in a hydrogen atmosphere and after 3 hydriding-dehydriding cycles were 57.9 and 53.2 m<sup>2</sup>/g, respectively.</p><p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.23.1.14878">http://dx.doi.org/10.5755/j01.ms.23.1.14878</a></p> |
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| ISSN: | 1392-1320 2029-7289 |