Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 21, Issue 5, Pages 1040-1046Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(11)60819-4
Keywords
complex hydride; LiBH4; MgB2; hydrogen storage; formation mechanism
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Funding
- National Basic Research Program of China [2010CB631300]
- National Natural Science Foundation of China [50631020]
- Program for New Century Excellent Talents in Universities, China [NCET-07-0741]
- University Doctoral Foundation of the Ministry of Education, China [20090101110050]
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The formation conditions of MgB2 in 2LiBH(4) + MgH2 system during dehydrogenation were investigated and its mechanism was discussed. The results show that direct decomposition of LiBH4 is suppressed under relative higher initial dehydrogenation pressure of 4.0x10(5) Pa, wherein LiBH4 reacts with Mg to yield MgB2, and 9.16% ( mass fraction) hydrogen is released within 9.6 h at 450 degrees C. However, under relatively lower initial dehydrogenation pressure of 1.0x10(2) Pa, LiBH4 decomposes independently instead of reacting with Mg, resulting in no formation of MgB2, and 7.91% hydrogen is desorbed within 5.2 h at 450 degrees C. It is found that the dehydrogenation of 2LiBH(4) + MgH2 system proceeds more completely and more hydrogen desorption amount can be obtained within a definite time by forming MgB2. Furthermore, it is proposed that the formation process of MgB2 includes incubation period and nucleus growth process. Experimental results show that the formation process of MgB2, especially the incubation period, is promoted by increasing initial dehydrogenation pressure at constant temperature, and the incubation period is also influenced greatly by dehydrogenation temperature.
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