Non-isothermal kinetics and in situ SR XRD studies of hydrogen desorption from dihydrides of binary Ti-V alloys

S. Suwarno*, J. K. Solberg, J. P. Mæhlen, R. V. Denys, B. Krogh, E. Ochoa-Fernández, B. T. Børresen, E. Rytter, I. E. Gabis, V. A. Yartys

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Phase transformations during dynamic dehydrogenation of Ti 1-xVxH2 (x = 0.1; 0.2; 0.3) were studied using in situ Synchrotron X-Ray Diffraction (SR XRD) and non-isothermal kinetics experiments. The main dehydrogenation path for γ-Ti1-xV xH2 was found to be γ → δ → β → βalloy. Body-centred tetragonal δ-hydride was found to be an intermediate phase of the γ → β transformation in Ti0.8-0.9V0.1-0.2H2. TDS, in situ SR XRD and isoconversional kinetics studies showed that hydrogen desorption from Ti 1-xVxH2 is composed of simultaneous reactions taking place between 300 and 600 C. The effective activation energy of hydrogen desorption depends on the vanadium contents and the reaction pathway, increasing from 21 kJ/mol H2 (γ → δ) to 60-110 kJ/mol H 2 (δ → β).

Original languageEnglish
Pages (from-to)14704-14714
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number34
DOIs
Publication statusPublished - 13 Nov 2013
Externally publishedYes

Keywords

  • In situ synchrotron X-ray diffraction
  • Isoconversional kinetics
  • Metal hydride
  • Thermal desorption spectroscopy
  • Titanium
  • Vanadium

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