Hydrogen desorption properties of magnesium hydride catalyzed multiply with carbon and silicon

Alicja Klimkowicz, Akito Takasaki, Łukasz Gondek, Henryk Figiel, Konrad ͆wierczek

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Abstract Magnesium hydride (MgH<inf>2</inf>) is considered as one of hydrogen storage materials. However, the application is limited because of slow hydrogen kinetics and high thermodynamic stability. In this study, MgH<inf>2</inf> powders were mechanically milled with graphite (C) and/or silicon (Si) powders, and effect of multiple addition of C and Si on hydrogen desorption properties was investigated. The multiple addition caused a decrease of the hydrogen desorption (onset and peak) temperatures more than single addition, and the lowest activation energy for hydrogen desorption, 62 kJ/mol, was obtained from sample powders of (2 mol MgH<inf>2</inf> + 0.5 mol C + 0.5 mol Si). The surface of the sample powders after mechanical milling revealed a good distribution of C on the MgH<inf>2</inf> surface and a presence of finer Si particles.

Original languageEnglish
Article number33242
Pages (from-to)S80-S83
JournalJournal of Alloys and Compounds
Volume645
Issue numberS1
DOIs
Publication statusPublished - 2015 Aug 11

Fingerprint

Silicon
Hydrides
Powders
Magnesium
Hydrogen
Desorption
Carbon
Distribution of goods
Graphite
Hydrogen storage
Thermodynamic stability
Activation energy
Kinetics
Temperature

Keywords

  • Graphite
  • Hydrogen sorption
  • Magnesium hydride
  • Mechanical alloying
  • Silicon

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

Cite this

Hydrogen desorption properties of magnesium hydride catalyzed multiply with carbon and silicon. / Klimkowicz, Alicja; Takasaki, Akito; Gondek, Łukasz; Figiel, Henryk; ͆wierczek, Konrad.

In: Journal of Alloys and Compounds, Vol. 645, No. S1, 33242, 11.08.2015, p. S80-S83.

Research output: Contribution to journalArticle

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AU - Klimkowicz, Alicja

AU - Takasaki, Akito

AU - Gondek, Łukasz

AU - Figiel, Henryk

AU - ͆wierczek, Konrad

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N2 - Abstract Magnesium hydride (MgH2) is considered as one of hydrogen storage materials. However, the application is limited because of slow hydrogen kinetics and high thermodynamic stability. In this study, MgH2 powders were mechanically milled with graphite (C) and/or silicon (Si) powders, and effect of multiple addition of C and Si on hydrogen desorption properties was investigated. The multiple addition caused a decrease of the hydrogen desorption (onset and peak) temperatures more than single addition, and the lowest activation energy for hydrogen desorption, 62 kJ/mol, was obtained from sample powders of (2 mol MgH2 + 0.5 mol C + 0.5 mol Si). The surface of the sample powders after mechanical milling revealed a good distribution of C on the MgH2 surface and a presence of finer Si particles.

AB - Abstract Magnesium hydride (MgH2) is considered as one of hydrogen storage materials. However, the application is limited because of slow hydrogen kinetics and high thermodynamic stability. In this study, MgH2 powders were mechanically milled with graphite (C) and/or silicon (Si) powders, and effect of multiple addition of C and Si on hydrogen desorption properties was investigated. The multiple addition caused a decrease of the hydrogen desorption (onset and peak) temperatures more than single addition, and the lowest activation energy for hydrogen desorption, 62 kJ/mol, was obtained from sample powders of (2 mol MgH2 + 0.5 mol C + 0.5 mol Si). The surface of the sample powders after mechanical milling revealed a good distribution of C on the MgH2 surface and a presence of finer Si particles.

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