Decomposition behavior of Ti-doped NaAlH4 studied using X-ray absorption spectroscopy at the titanium K-edge

E. Bruster, T. A. Dobbins, R. Tittsworth, D. Anton

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations

Abstract

The local bonding environment of Ti3+-dopant atoms in NaAlH 4 after decomposition to release H2 has been studied using x-ray absorption fine structure (XAFS). The titanium K-edge spectra from doped hydride samples and the standard materials TiCl3 and TiO2 were collected in ambient atmosphere at the synchrotron source at the Center for Advanced Microstructures and Devices (CAMD). Titanium valence states present in the spectra collected from Ti-doped NaAlH4 after decomposition in air are Ti3+ and Ti4+. The Ti3+ is attributed to unreacted TiCl3. The Ti4+ present in the sample is attributed to TiO2 occurring after air oxidation. Coupled with studies of the kinetics of hydrogen desorption reactions, examination of dopant ion valence states after entry into the lattice may lead to better understanding of the interrelationship between lattice doping and desorption kinetics.

Original languageEnglish (US)
Article numberN3.4
Pages (from-to)47-52
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume837
StatePublished - Dec 20 2005
Externally publishedYes
Event2004 Materials Research Society Fall Meeting - Boston, MA, United States
Duration: Dec 1 2004Dec 2 2004

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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