Materials designing of metal borohydrides: Viewpoints from thermodynamical stabilities

H. W. Li, S. Orimo, Y. Nakamori, K. Miwa, N. Ohba, S. Towata, A. Züttel

Research output: Contribution to journalArticlepeer-review

149 Citations (Scopus)

Abstract

Double-cation borohydrides MLim-n(BH4)m (M = Zn, n = 2; M = Al, n = 3; M = Zr, n = 4; n ≤ m) were expected to be synthesized and their thermodynamical stabilities were also examined experimentally. The samples with the compositions of ZnLi(BH4)3 and AlLi(BH4)4 disproportionate into Zn(BH4)2- (or Al(BH4)3-) and LiBH4-based phases upon heating, respectively. However, no disproportionation reaction is observed in ZrLim-4(BH4)m (m = 5 and 6). It should be emphasized that hydrogen desorption temperature Td of ZrLim-4(BH4)m continuously increases from 440 to 650 K as the composition m increases from 4 to 6, and approaches to 740 K (Td of LiBH4). The experimental results indicate that the combination of appropriate cations is an effective method to adjust the thermodynamical stabilities of metal borohydrides, similar to the conventional "alloying" method for hydrogen storage alloys.

Original languageEnglish
Pages (from-to)315-318
Number of pages4
JournalJournal of Alloys and Compounds
Volume446-447
DOIs
Publication statusPublished - 2007 Oct 31

Keywords

  • Hydrogen absorbing materials
  • Mechanical alloying
  • Thermal analysis
  • Thermodynamic properties

ASJC Scopus subject areas

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

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