Mg2NiH4 synthesis and decomposition reactions

Research output: Contribution to journalArticle

Abstract

A ternary Mg2NiH4 hydride was synthesized using method that relies on a relatively short mechanical milling time (one hour) of a 2:1 MgH2-Ni powder mixture followed by sintering at a sufficiently high hydrogen pressure (>85 bar) and temperature (>400 degrees C). The ternary hydride forms in less than 2.5 h (including the milling time) with a yield of similar to 90% as a mixture of two polymorphic forms. The mechanisms of formation and decomposition of ternary Mg2NiH4 under different hydrogen pressures were studied in detail using an in situ synchrotron radiation powder X-ray diffraction (SR-PXD) and high pressure DSC. The obtained experimental results are supported by morphological and microstructural investigations performed using SEM and high resolution STEM. Additionally, effects occurring during the desorption reaction were studied using DSC coupled with mass spectrometry. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Details

Authors
  • M. Polanski
  • T. K. Nielsen
  • I. Kunce
  • M. Norek
  • T. Plocinski
  • L. R. Jaroszewicz
  • Carsten Gundlach
  • T. R. Jensen
  • J. Bystrzycki
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Sciences
  • Natural Sciences

Keywords

  • Magnesium nickel hydride, Synthesis, Decomposition, In situ synchrotron, radiation powder diffraction, High pressure DSC, Structure
Original languageEnglish
Pages (from-to)4003-4010
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number10
Publication statusPublished - 2013
Publication categoryResearch
Peer-reviewedYes