Hydrogen sorption properties of nanocrystalline Mg2FeH6-based complex and catalytic effect of TiO2 |
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| Authors: | Yi Liu Sheng-long Tang Yu-hu Fang Huai-fei Liu Jian-min Cui and Song-lin Li |
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| Affiliation: | [1]State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China [2]Shenzhen Jinzhou Precision Technology Corporation Ltd, Shenzhen 518116, China [3]Powder Metallurgy Corporation Ltd, Laiwu Iron and Steel Group, Laiwu 271105, China |
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| Abstract: | The diversities of hydrogen sorption properties of Mg2FeH6-based complexes with and without TiO2 were investigated. Mg2FeH6-based complexes with and without TiO2 were synthesized respectively by reactive mechanical alloying, and hydrogen sorption properties of the complexes were examined
by Sieverts-type apparatus. The results show that the sample without TiO2 releases 4.43 % (mass fraction) hydrogen in 1.5 ks at 653 K under 0.1 MPa H2 pressure and absorbs 90% of the total 4.43 % (mass fraction) hydrogen absorbed in 85 s at 623 K under 4.0 MPa H2 pressure. But for the sample with TiO2 addition under the same condition, it only needs 400 s to release all of the stored hydrogen and 60 s to absorb 90% of the
total hydrogen absorbed. The activation energies for desorption process of the samples with and without TiO2 are determined to be 71.2 and 80.3 kJ/(mol·K), respectively. The improvement in hydrogen sorption rate and and reduction
in activation energy can be attributed to the addition of TiO2. |
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| Keywords: | Mg-based hydrogen storage materials reactive mechanical alloying hydrogen sorption properties kinetics activation energy |
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