Mg-based composites for hydrogen storage
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2019
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BRAZIL MRS MEETING, 18th
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Resumo
Magnesium hydride can be already considered as the traditional hydrogen
storage material despite some unanswered fundamental questions concerning its
properties. These questions concern the understanding of the activation (or first
hydrogen absorption) step, the role of the additives in the absorption / desorption
kinetics and the synergy between phases in the absorption / desorption kinetics,
in the case of composites systems.
Recent results indicated that modifications of conventional processing routes to
synthesize hydride-forming systems might have a strong role in the hydrogen
storage behavior of different metals and compounds. The present work shows
results of Mg-TiFe and Mg-LaNi5 composites that have been produced by new
approaches of the usual techniques, such as high-energy ball milling (HEBM) and
cold rolling (CR) under inert atmosphere. Structural characterization was carried
out by X-ray diffraction (XRD) and scanning and transmission electron microscopy
(SEM and TEM). H-absorption / desorption kinetics were measured in a Sievert’stype
apparatus and by differential scanning calorimetry (DSC) coupled with
thermogravimetric analysis (TGA) and mass spectrometry (QMS).
MgH2 hydride was formed at room temperature in Mg-TiFe composites produced
by HEBM, in this case with an important improvement in the hydrogen absorption
kinetic as compared with pure Mg. MgH2-LaNi5 composites were prepared by cold
rolling under an inert atmosphere and the composite presented faster hydrogen
absorption/desorption kinetics and reduced desorption temperatures in
comparison to MgH2. These results are discussed in view of the above
fundamental questions, in particular considering the possible synergy between
Mg and the second phase (TiFe or LaNi5) in the modification of absorption and desorption kinetics.
Como referenciar
BOTTA, WALTER J.; LEAL NETO, RICARDO M.; JORGE JUNIOR, ALBERTO M.; ZEPON, GUILHERME; ISHIKAWA, TOMAZ T.; BOLFARINI, CLAUDEMIRO; KIMINAMI, CLAUDIO S.; LEIVA, DANIEL R. Mg-based composites for hydrogen storage. In: BRAZIL MRS MEETING, 18th, September 22-26, 2019, Balneário Camburiú, SC. Abstract... São Carlos, SP: Aptor Software, 2019. p. 47-48. Disponível em: http://repositorio.ipen.br/handle/123456789/31046. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.