Reversible vacancy formation and recovery during dehydrogenation- hydrogenation cycling of Ti-doped NaAlH4

Kouji Sakaki, Yumiko Nakamura, Etsuo Akiba, Meredith T. Kuba, Craig M. Jensen

研究成果: ジャーナルへの寄稿学術誌査読

19 被引用数 (Scopus)

抄録

The mechanism of the dehydrogenation-rehydrogenation of Ti-doped NaAlH 4 was investigated through X-ray diffraction (XRD) studies and Doppler broadening measurements of positron annihilation. Phase transformations during dehydrogenation and hydrogenation half-cycles were studied by the Rietveld analysis of XRD profiles. Changes in lattice defects were monitored by determination of the S parameter of the Doppler broadening spectra, which shows the ratio of positron annihilation to valence electrons. No significant changes in lattice parameters and the S parameter were observed directly following Ti doping. However, the S parameter increased upon dehydrogenation and decreased following rehydrogenation. These results indicate that vacancies are not introduced into NaAlH4 upon Ti doping, but rather, they arise during dehydrogenation and disappear during rehydrogenation.

本文言語英語
ページ(範囲)6869-6873
ページ数5
ジャーナルJournal of Physical Chemistry C
114
14
DOI
出版ステータス出版済み - 4月 15 2010
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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