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 journalArticlepeer-review

6 Citations (Scopus)

Abstract

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.

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

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

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