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Journal of Central South University of Technology

, Volume 16, Issue 6, pp 876–880 | Cite as

Hydrogen sorption properties of nanocrystalline Mg2FeH6-based complex and catalytic effect of TiO2

  • Yi Liu (刘 燚)
  • Sheng-long Tang (汤盛龙)
  • Yu-hu Fang (方于虎)
  • Huai-fei Liu (刘怀菲)
  • Jian-min Cui (崔建民)
  • Song-lin Li (李松林)Email author
Article

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.

Key words

Mg-based hydrogen storage materials reactive mechanical alloying hydrogen sorption properties kinetics activation energy 

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Copyright information

© Central South University Press and Springer Berlin Heidelberg 2009

Authors and Affiliations

  • Yi Liu (刘 燚)
    • 1
    • 2
  • Sheng-long Tang (汤盛龙)
    • 1
  • Yu-hu Fang (方于虎)
    • 1
  • Huai-fei Liu (刘怀菲)
    • 1
  • Jian-min Cui (崔建民)
    • 3
  • Song-lin Li (李松林)
    • 1
    Email author
  1. 1.State Key Laboratory of Powder MetallurgyCentral South UniversityChangshaChina
  2. 2.Shenzhen Jinzhou Precision Technology Corporation LtdShenzhenChina
  3. 3.Powder Metallurgy Corporation LtdLaiwu Iron and Steel GroupLaiwuChina

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