Nature of the chemical bond in complex hydrides, NaAlH4, LiAlH4, LiBH4 and LiNH2

Yoshino, Masao; Komiya, Kenji; Takahashi, Yasutaka; Shinzato, Y.; Yukawa, Hiroshi; Morinaga, Masahiko

doi:10.1016/j.jallcom.2004.09.078

Cited by 42 publications

(33 citation statements)

References 15 publications

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“…Metal borohydrides (M(BH 4 ) n ), such as LiBH 4 and Mg(BH 4 ) 2 [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] have been attracting great interest as one of the potential candidates of advanced hydrogen storage materials, because of their high gravimetric hydrogen densities.…”

Section: Introductionmentioning

confidence: 99%

Materials designing of metal borohydrides: Viewpoints from thermodynamical stabilities

Orimo

Nakamori

et al. 2007

Journal of Alloys and Compounds

171

133

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Double-cation borohydrides MLi m−n (BH 4 ) 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(BH 4 ) 3 and AlLi(BH 4 ) 4 disproportionate into Zn(BH 4 ) 2 -(or Al(BH 4 ) 3 -) and LiBH 4 -based phases upon heating, respectively. However, no disproportionation reaction is observed in ZrLi m−4 (BH 4 ) m (m = 5 and 6). It should be emphasized that hydrogen desorption temperature T d of ZrLi m−4 (BH 4 ) 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 LiBH 4 ). 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.

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Section: Introductionmentioning

confidence: 99%

Materials designing of metal borohydrides: Viewpoints from thermodynamical stabilities

Orimo

Nakamori

et al. 2007

Journal of Alloys and Compounds

171

133

View full text Add to dashboard Cite

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“…Based on this correlation, experimental studies have been preformed to lower the stability of complex hydrides [6][7][8]. Also, theoretical calculations indicate that this tendency can be applied not only to alkaline metal borohydride, but also to other borohydrides with alkaline-earth metals or some of transition metals [9,10].…”

Section: Introductionmentioning

confidence: 99%

Magnesium borohydride: A new hydrogen storage material

et al. 2008

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Magnesium borohydride (Mg(BH 4 ) 2 ) is a promising material for hydrogen storage because of its high gravimetric storage density (15.0 mass%). We intended to synthesize Mg(BH 4 ) 2 by decomposition reaction of LiBH 4 with MgCl 2 by heat treatment without using a solvent, where the product consists of LiCl and a compound of magnesium, boron and hydrogen. Hydrogen desorption temperature of the product is approximately 100 K lower than that of LiBH 4 and the decomposition consists of a two-step reaction. The products of the 1st and 2nd decomposition reactions are MgH 2 and Mg, respectively. This result indicates the following two-step reaction (1st reaction: Mg(BH 4 ) 2 -MgH 2 +2B+3H 2 , 2nd reaction: MgH 2 -Mg+H 2 ). The first decomposition peak is dominant and is around 563 K. The 2nd decomposition occurs at the temperature greater than 590 K.

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“…Bogdanović and Schwickardi first demonstrated that the doping of Ti catalyst enhances the kinetic and reversibility of hydrogen absorption and desorption reaction of NaAlH 4 [1]. Then, an extensive study has been made on the alanate systems experimentally and theoretically [2][3][4][5][6]. * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%