Abstract
The Mg10YNi alloy was hydrogenated and then coupled with LiBH4 to form LiBH4/Mg10YNi-H reactive hydride composite. The results indicate that thermal dehydrogenation stability of LiBH4 can be remarkably reduced by combining with Mg10YNi hydride. The starting and ending temperatures for hydrogen desorption from the LiBH4/Mg10YNi-H composite are approximately 275 and 430 oC, respectively. Dehydrogenation of the LiBH4/Mg10YNi-H composite proceeds mainly in two steps with a total reaction of 12LiBH4 + 2.5Mg10YNiH20 → 24Mg + MgNi2.5B2 + 2.5YB4 + 12LiH + 43H2. After rehydrogenation at 450 oC under 9 MPa hydrogen pressure, the LiBH4/Mg10YNi-H composite starts to release hydrogen around 260 oC, and as much as approximately 5.2 wt.% of hydrogen can be desorbed during the second dehydrogenation process.
Highlights
The increasing consumption of fossil fuels makes it urgent to develop new energy carriers, in which hydrogen shows great promise as an ideal alternative due to its high calorific value, clean burning products and abundant resources
For safely storing hydrogen with high efficiency, solid-state hydrogen storage materials have been intensively studied during the last several decades[1,2,3,4,5,6]
The practical application of LiBH4 is strongly limited by its high dehydrogenation temperature, sluggish dehydrogenation process and rigorous rehydrogenation conditions[7,8]
Summary
The increasing consumption of fossil fuels makes it urgent to develop new energy carriers, in which hydrogen shows great promise as an ideal alternative due to its high calorific value, clean burning products and abundant resources. The practical application of LiBH4 is strongly limited by its high dehydrogenation temperature, sluggish dehydrogenation process and rigorous rehydrogenation conditions[7,8] To overcome these deficiencies, various approaches such as catalyst addition[9,10,11], cation/anion substitution[12,13,14] and nanoconfinement[15,16,17] have been developed and utilized. In order to enrich such an effect and further promote the development of LiBH4-based hydrogen storage materials, the LiBH4/Mg10YNi-H composite was prepared to investigate its reversible hydrogen storage property and reactive mechanism in this paper
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