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.
N1 - Funding Information:
This study was partially supported by the New Energy and Industrial Technology Development Organization (NEDO), International Joint Research under the “Development for Safe Utilization and Infrastructure of hydrogen” Project (2005–2007) and the Grants-in-Aid of Japan Society for the Promotion of Science (JSPS).
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.
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U2 - 10.1016/j.jallcom.2007.02.156
DO - 10.1016/j.jallcom.2007.02.156
M3 - Article
AN - SCOPUS:35148851178
SN - 0925-8388
VL - 446-447
SP - 315
EP - 318
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -