Hydrogen storage properties of TiFe prepared by cold rolling under inert atmosphere
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2017
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LATIN AMERICAN CONFERENCE ON METASTABLE AND NANOSTRUCTURED MATERIALS, 7th
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In this study, TiFe was prepared through the arc melting of Ti and Fe powders in the
stoichiometric ratio 50:50, and then submitted to 20 and 40 cold rolling passes under inert
atmosphere. The structural characterization of the samples revealed coarse grains after arc
melting, formation of small cracked foils and the presence of powder, which was constituted
of small particles agglomerated in the process of cold rolling. The local crystal structure was
confirmed to be CsCl-type by EXAFS measurements on the initial compound after 20 CR at
Fe and Ti K-edges which is expected for the stoichiometry. No absorption of hydrogen was
observed in the sample processed by arc melting. On the other hand, the cold rolled material
exhibited fast hydrogen absorption without using a thermal activation process. Regarding the
hydrogen absorption capacities, around 1.4 wt. %. was achieved at room temperature and 20
bar of H2, for samples in the form of powder or foils. The process of cold rolling under inert
atmosphere generated a product free of contamination by oxides, introducing simultaneously
a high amount of defects in the material, which contributes for better hydrogen absorption
kinetics.
Como referenciar
VEGA, L.E.R.; LEIVA, D.R.; FIGUEROA, S.J.A.; SILVA, W.B.; LEAL NETO, R.M.; ISHIKAWA, T.T.; BOTTA, W.J. Hydrogen storage properties of TiFe prepared by cold rolling under inert atmosphere. In: LATIN AMERICAN CONFERENCE ON METASTABLE AND NANOSTRUCTURED MATERIALS, 7th, March 19-22, 2017, Brotas, SP. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/28613. Acesso em: 30 Dec 2025.
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