The LiBH4?Mg(BH4)2 system has been investigated as a possible hydrogen storage material. Several composites were synthesized by ball milling, namely, xLiBH4?(1?x)Mg(BH 4)2 with x = 0, 0.10, 0.25, 0.33, 0.40, 0.50, 0.60, 0.66, 0.75, 0.80, 0.90, 1. The physical mixture was investigated by using X- ray powder diffraction and thermal analysis. Interestingly, already a small amount of LiBH4 makes the α to β transition of Mg(BH 4)2 reversible, which has not been reported before. The eutectic composition was found to exist at 0.50 < x < 0.60 exhibiting a eutectic melting at 180 °C. A phase diagram was built based on the data obtained in this study. Furthermore, the decomposition of the material begins right after the melting; thus, the decomposition temperature of the composite is much lower than those of the pure borohydrides. At 270 °C the x = 0.50 composite releases about 7.0 wt % of hydrogen. © 2011 American Chemical Society.
Bardají, E., Zhao Karger, Z., Boucharat, N., Nale, A., van Setten, M., Lohstroh, W., et al. (2011). LiBH4-Mg(BH4)2: a physical mixture of metal borohydrides as hydrogen storage material. JOURNAL OF PHYSICAL CHEMISTRY. C, 115(13), 6095-6101 [10.1021/jp110518s].
LiBH4-Mg(BH4)2: a physical mixture of metal borohydrides as hydrogen storage material
NALE, ANGELOCLAUDIO;CATTI, MICHELE;
2011
Abstract
The LiBH4?Mg(BH4)2 system has been investigated as a possible hydrogen storage material. Several composites were synthesized by ball milling, namely, xLiBH4?(1?x)Mg(BH 4)2 with x = 0, 0.10, 0.25, 0.33, 0.40, 0.50, 0.60, 0.66, 0.75, 0.80, 0.90, 1. The physical mixture was investigated by using X- ray powder diffraction and thermal analysis. Interestingly, already a small amount of LiBH4 makes the α to β transition of Mg(BH 4)2 reversible, which has not been reported before. The eutectic composition was found to exist at 0.50 < x < 0.60 exhibiting a eutectic melting at 180 °C. A phase diagram was built based on the data obtained in this study. Furthermore, the decomposition of the material begins right after the melting; thus, the decomposition temperature of the composite is much lower than those of the pure borohydrides. At 270 °C the x = 0.50 composite releases about 7.0 wt % of hydrogen. © 2011 American Chemical Society.
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