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Materials designing of metal borohydrides: Viewpoints from thermodynamical stabilities

  • Li, H.-W. Institute for Materials Research, Tohoku University, Sendai, Japan
  • Orimo, S. Institute for Materials Research, Tohoku University, Sendai, Japan
  • Nakamori, Y. Institute for Materials Research, Tohoku University, Sendai, Japan
  • Miwa, K. Toyota Central R+D Labs., Inc., Nagakute, Aichi, Japan
  • Ohba, N. Toyota Central R+D Labs., Inc., Nagakute, Aichi, Japan
  • Towata, S. Toyota Central R+D Labs., Inc., Nagakute, Aichi, Japan
  • Züttel, Andreas Physics Department, University of Fribourg, Switzerland
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    12.03.2007
Published in:
  • Journal of Alloys and Compounds. - 2007, vol. 446-447, p. 315-318
hydrogen absorbing materials
mechanical alloying
thermodynamic properties
thermal analysis
English 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.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/300724
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