Hydrogen Storage Properties of 2LiBH4/LiAlH4/0.5CaC2 Composite
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Abstract
In order to improve the hydrogen storage property of LiBH4, 2LiBH4/LiAlH4/0.5CaC2 composite was prepared with ball-milling method. The de-rehydrogenation properties and reaction mechanism were investigated with X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR) and pressure-composite-temperature testing apparatus(PCT). The results show that dehydrogenation of the 2LiBH4/LiAlH4/0.5CaC2 composite accomplishes at approximately 440℃, with about 6.2% (mass fraction) of hydrogen totally desorbed. In the process of hydrogen desorption, CaC2 is directly involved in the reaction to cause the destabilization of the reaction, thus improving the dehydrogenation property. After rehydrogenation at 450℃ and 9 MPa for 12 h, 5.4% (mass fraction) of hydrogen can be absorbed. The reversible hydrogen storage property is improved obviously with respect to pristine LiBH4.
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