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Characterization of amorphous Nb oxide and its influence on Mg hydrogen sorption

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Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 103 Issue 9

Abstract

Amorphous Nb2O5 was synthesized by combining niobium ethoxide with an amine surfactant. The material turned out to have a high surface area, 287 m2 g−1, and a homogeneous structure. The material was shown to be amorphous despite the heat treatment performed within a range of 150 to 550°C. The surface area of Nb2O5 reduced to 105 m2 g−1 after heat treating at 350°C. The activation energy of the Nb2O5 crystallization reaction was found to be 327 kJ mol−1. The surface area of Nb2O5 reduced significantly with heat treatment but it still improved the hydrogen kinetics since the desorption rate was 1.5 wt.% min−1. The addition of a small amount of amorphous Nb2O5 to magnesium hydride, throughout milling, helped overcoming limitations inherent to solid hydrogen storage.

Keywords: Amorphous oxide; Crystallization; Hydrogen storage; Magnesium hydride
1 Correspondence address: Dr. Mariana Brum, Cid. Universitária – Centro de Tecnologia – Building F, Ilha do Fundão – P.O. BOX 68505, Rio de Janeiro, RJ-21941-972 – Brazil, Tel.: +55 (21) 2562-8506, Fax: +55 (21) 2290-1615 n. 235, E-mail:

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Received: 2011-11-23
Accepted: 2012-5-5
Published Online: 2013-06-11
Published in Print: 2012-09-01

© 2012, Carl Hanser Verlag, Munich

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https://doi.org/10.3139/146.110803
Keywords for this article
Amorphous oxide; Crystallization; Hydrogen storage; Magnesium hydride

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. RQ 14 – “Rapidly Quenched and Metastable Materials”
  5. Conference Proceedings
  6. Crystallization control in highly undercooled liquids and glasses
  7. Cooling conditions for the generation of bulk metallic glasses by droplet deposition
  8. Formation and microstructure of Ni62-xNb38Tix (x = 3, 6, 10 at.%) bulk metallic glasses
  9. Compositional features of bulk metallic glasses analyzed with a tetrahedral composition diagram from s-, p-, d- and f-blocks
  10. A partial structure factor investigation of the bulk metallic glass Zr63Ni25Al12 as studied by using a combination of anomalous X-ray scattering and reverse Monte Carlo modeling
  11. Mechanical behavior of the cold-rolled Zr57Ti8Nb2.5Cu13.9Ni11.1Al7.5 metallic glass–quasicrystalline composite
  12. Effect of rapid quenching and severe plastic deformation on silver
  13. Effect of Fe and V additions on amorphous structure formation in melt spun AlNiZr alloys
  14. Processing and characterization of mechanically alloyed immiscible metals
  15. Milling-induced polymorphic transformation in MoSi2
  16. Attainment of quasicrystalline phase in Al–Cu–Fe alloy via melting and mechanical alloying
  17. Characterization of amorphous Nb oxide and its influence on Mg hydrogen sorption
  18. Mechanochemistry and H-sorption properties of Mg2FeH6-based nanocomposites
  19. Rapidly solidified Fe-base alloys as electrode materials for water electrolysis
  20. Solidification of PTA aluminide coatings
  21. Superparamagnetic CoFe2O4 prepared via a modified oxalate method
  22. People
  23. Dr. Wolfgang Hoffelner
  24. Prof. Dr. Herbert Ipser
  25. DGM News
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