Improved ball milling method for the synthesis of nanocrystalline TiFe compound ready to absorb hydrogen
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International Journal of Hydrogen Energy
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In this study, we propose a method to produce nanocrystalline TiFe powder by high-energy
ball milling, in order to avoid the common sticking problem of the material to the milling
tools, assuring a material prompt to absorb hydrogen as well. The method consists of
making a preliminary milling operation with the elemental powders (50:50 stoichiometric
ratio) to form a strong adhered layer of the milled material on the surfaces of the vial and
balls. The main milling operation is then performed with a new powder charge (same
composition as before), but now adding a process control agent (stearic acid). Various
processing times - 2, 6, 10 and 20 h - were used in the milling experiments. Nanocrystalline
TiFe was synthesized in this way with low oxygen contamination, full yields for milling
times of 6 h or over, requiring no heat treatments for the first hydrogen absorption.
Hydrogen storage capacity of 1.0 wt% at room temperature under 20 bar was attained by
the sample milled for 6 h. Kinetic data from samples milled for 2 h and 6 h agreed with
Jander model for the rate limiting step of the hydriding reaction, which is based on
diffusion with constant interface area.
Como referenciar
VEGA, L.E.R.; LEIVA, D.R.; LEAL NETO, R.M.; SILVA, W.B.; SILVA, R.A.; ISHIKAWA, T.T.; KIMINAMI, C.S.; BOTTA, W.J. Improved ball milling method for the synthesis of nanocrystalline TiFe compound ready to absorb hydrogen. International Journal of Hydrogen Energy, v. 45, n. 3, p. 2084-2093, 2020. DOI: 10.1016/j.ijhydene.2019.11.035. Disponível em: http://repositorio.ipen.br/handle/123456789/31105. Acesso em: 20 Mar 2026.
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