Imaging the hydrogenation of Mg thin films

Efi Hadjixenophontos, Manuel Roussel, Toyoto Sato, Andreas Weigel, Patrick Stender, Shin ichi Orimo, Guido Schmitz

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Among the metal hydride materials, magnesium (Mg) and its alloys show excellent performance for hydrogen storage. The main drawback is the slow hydrogen absorption and desorption kinetics, the sole barrier to commercial adoption. In this work we use Mg thin films as model materials in order to study these kinetics, and observe the growth process of the hydride. Palladium (Pd) is used as a catalyst coating for improving the conditions of hydrogenation. The hydride formation is followed by in-situ X-ray diffraction. Microscopic imaging of the co-existence of Mg and MgH2 is presented. The microstructure change is clearly visible in the micrographs, despite the fact that sample preparation damages the hydride phase. The transformation from columnar grains of the as-deposited Mg thin film, to a grainy equi-axed structure film indicate that the hydride is observed. The hydride is immediately formed at the interface between the Pd and the Mg thin film and grows in a layer-like reaction towards the substrate (SiO2). These combined techniques provide an efficient methodology to follow the kinetics of hydride formation within the layer, and study further the diffusion coefficients and mechanism of hydrogenation.

Original languageEnglish
Pages (from-to)22411-22416
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number35
DOIs
Publication statusPublished - 2017 Aug 31

Keywords

  • Cross section thin films
  • Hydrogenation
  • In-situ X-ray diffraction
  • Magnesium hydride
  • Phase growth
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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