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Effect of Hafnium Addition on the Hydrogenation Process of TiFe Alloy

Author

Listed:
  • Volatiana Razafindramanana

    (Univ. Bordeaux, CNRS, Bordeaux INP, ICMCB, UMR 5026, F-33600 Pessac, France
    Hydrogen Research Institute, Université du Québec à Trois-Rivières, 3351 boul., des Forges, C,P 500, Trois-Rivières, QC G9A 5H7, Canada)

  • Stéphane Gorsse

    (Univ. Bordeaux, CNRS, Bordeaux INP, ICMCB, UMR 5026, F-33600 Pessac, France)

  • Jacques Huot

    (Hydrogen Research Institute, Université du Québec à Trois-Rivières, 3351 boul., des Forges, C,P 500, Trois-Rivières, QC G9A 5H7, Canada)

  • Jean Louis Bobet

    (Univ. Bordeaux, CNRS, Bordeaux INP, ICMCB, UMR 5026, F-33600 Pessac, France)

Abstract

The alloy TiFe has interesting hydrogen storage properties for practical applications: low cost, operation at room temperature, and good hydrogen capacity. However, the first hydrogenation is difficult and increases the cost of the alloy. In this work, we studied the effect of adding hafnium to TiFe in order to enhance the first hydrogenation process. TiFe + x Hf alloys, with x = 0, 4, 8, 12, and 16 wt.%, were synthesized by arc melting. The microstructure of the as-cast alloys was investigated by scanning electron microscopy and electron microprobe analysis. These alloys consisted of B2-TiFe, C14-Laves, and BCC (Body Centered Cubic) phases. A minimum of 8 wt.% of hafnium is required to obtain an enhancement of the first hydrogenation. In the first hydrogenation, the material reaches its maximal hydrogen capacity in less than two hours at room temperature and under 20 bars of hydrogen. Hafnium addition also had the effect of lowering the plateau pressure in the pressure-composition isotherm. It could be concluded that hafnium has a positive effect on the activation properties of TiFe.

Suggested Citation

  • Volatiana Razafindramanana & Stéphane Gorsse & Jacques Huot & Jean Louis Bobet, 2019. "Effect of Hafnium Addition on the Hydrogenation Process of TiFe Alloy," Energies, MDPI, vol. 12(18), pages 1-9, September.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:18:p:3477-:d:265552
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