A study of the thermodynamic destabilization of sodium aluminum hydride (NaAlH4) with titanium nitride (TiN) using X-ray diffraction and residual gas analysis

Whitney Fisher Ukpai, Tabbetha A. Dobbins

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

This project is designed to extend the limits of hydrogen storage technology for practical purposes. Currently, there is a need to develop systems which release hydrogen at lower temperatures. The addition of destabilizers are believed to lower the H2 gas desorption temperatures by forming a stable product phase comprised of the hydrogen coordinated cation and the destabilizer phase cation. In this case, TiN is added to NaAlH4 in order to destabilize the AlH4- complex by forming a stable Ti-Al alloy. Although the bond energy in the nitride phase is high, x-ray diffraction shows the product intermetallic phase TiAl to form. The sodium alanate powders were mixed using titanium nitride (TiN) and the mixture was high energy ball milled. The samples had varying concentrations of TiN (e.g. 25 mol%, 50 mol%, and 75 mol%). X-ray relative peak intensity analysis shows that the content of TiAl formed increases with increasing TiN added to the NaAlH 4 system. Moreover, residual gas analysis of the 25 mol % TiN in NaAlH4 sample shows that the onset of desorption occurs at 60-70°C, with the peak temperature of hydrogen evolution from this stoichiometry occurring at 110°C.

Original languageEnglish (US)
Title of host publicationMaterials Challenges in Alternative and Renewable Energy, Energy 2010 - A Collection of Papers Presented at the Materials Challenges in Alternative and Renewable Energy Conference
PublisherAmerican Ceramic Society
Pages99-106
Number of pages8
ISBN (Print)9781118016053
DOIs
StatePublished - 2011

Publication series

NameCeramic Transactions
Volume224
ISSN (Print)1042-1122

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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