Effects of microwave irradiation on metal hydrides and complex hydrides

Y. Nakamori, M. Matsuo, K. Yamada, T. Tsutaoka, S. Orimo

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Effects of single-mode microwave irradiation on metal hydrides, MHn (LiH, MgH2, CaH2, TiH2, VH0.81, ZrH2, and LaH2.48) and complex hydrides MBH4 (LiBH4, NaBH4, and KBH4) were systematically investigated. Among the metal hydrides, TiH2, VH0.81, ZrH2, and LaH2.48 exhibit a rapid heating by microwave irradiation, where small amount of hydrogen (less than 0.5 mass%) are desorbed. On the other hand, LiBH4 is heated above 380 K by microwave irradiation, where 13.7 mass% of hydrogen is desorbed. The rapid heating of metal hydrides such as TiH2, VH0.81, ZrH2, and LaH2.48 are mainly due to the conductive loss. Meanwhile the microwave heating in LiBH4 is attributed to the conductive loss which is caused by a structural transition. The difference in the amount of desorbed hydrogen between metal hydrides and complex hydrides might be caused by the different microwave penetration depth and/or the temperature saturation in the microwave irradiation process. Microwave heating might be applied to hydrogen storage system, though further development of hydrides themselves and engineering techniques are required.

Original languageEnglish
Pages (from-to)698-702
Number of pages5
JournalJournal of Alloys and Compounds
Volume446-447
DOIs
Publication statusPublished - 2007 Oct 31

Keywords

  • Dielectric response
  • Gas-solid reaction
  • Hydrogen absorbing materials
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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