Microstructural evolution of ball-milled MgH2 during a complete dehydrogenation-hydrogenation cycle

Ádám Révész, Dániel Fátay

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Repeated dehydriding-hydriding cycles of ball-milled nanocrystalline MgH2 was carried out in a Sieverts'-type apparatus. In order to characterize the microstructural changes during a complete MgH2 → Mg → MgH2 transformation, the fourth desorption and subsequent absorption were interrupted at different hydrogenation stages. Convolutional multiple whole profile fitting procedure of the corresponding X-ray diffractograms was applied to reveal the evolution of microstructural parameters during the sorption cycle, such as average coherent domain size and crystallite size distribution. Complementary analysis of lattice parameters was also carried out. In this paper we demonstrate that analysing solely the evolution of microstructural parameters during cycling leads to similar rate-controlling mechanisms obtained by sorption kinetic measurements.

Original languageEnglish
Pages (from-to)6997-7002
Number of pages6
JournalJournal of Power Sources
Volume195
Issue number20
DOIs
Publication statusPublished - Oct 15 2010

Keywords

  • Grain size
  • Hydrogen storage
  • Magnesium
  • Nanocrystal
  • Sorption
  • X-ray line profile analysis

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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