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

5 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

Keywords

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

ASJC Scopus subject areas

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

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