Materials designing of metal borohydrides: Viewpoints from thermodynamical stabilities

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

doi:10.1016/j.jallcom.2007.02.156

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 journal › Article › peer-review

155 Citations (Scopus)

Abstract

Double-cation borohydrides MLi_m-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 ZrLi_m-4(BH₄)_m (m = 5 and 6). It should be emphasized that hydrogen desorption temperature T_d of ZrLi_m-4(BH₄)_m continuously increases from 440 to 650 K as the composition m increases from 4 to 6, and approaches to 740 K (T_d 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 language	English
Pages (from-to)	315-318
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	446-447
DOIs	https://doi.org/10.1016/j.jallcom.2007.02.156
Publication status	Published - 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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10.1016/j.jallcom.2007.02.156

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title = "Materials designing of metal borohydrides: Viewpoints from thermodynamical stabilities",

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.",

keywords = "Hydrogen absorbing materials, Mechanical alloying, Thermal analysis, Thermodynamic properties",

author = "Li, {H. W.} and S. Orimo and Y. Nakamori and K. Miwa and N. Ohba and S. Towata and A. Z{\"u}ttel",

year = "2007",

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day = "31",

doi = "10.1016/j.jallcom.2007.02.156",

language = "English",

volume = "446-447",

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TY - JOUR

T1 - Materials designing of metal borohydrides

T2 - Viewpoints from thermodynamical stabilities

AU - Li, H. W.

AU - Orimo, S.

AU - Nakamori, Y.

AU - Miwa, K.

AU - Ohba, N.

AU - Towata, S.

AU - Züttel, A.

PY - 2007/10/31

Y1 - 2007/10/31

N2 - 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.

AB - 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.

KW - Hydrogen absorbing materials

KW - Mechanical alloying

KW - Thermal analysis

KW - Thermodynamic properties

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Materials designing of metal borohydrides: Viewpoints from thermodynamical stabilities

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Keywords

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