期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 689, 期 -, 页码 187-191出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.07.313
关键词
Complex hydride; LiBH4; Li3BO3; Hydrogen storage property; Additive
资金
- National Natural Science Foundation of China [51571173]
- Scientific Research Projects in Colleges and Universities in Hebei Province, China [ZD2014004]
LiBH4 is considered a promising hydrogen storage material for automotive applications; however, its usage is limited because of unfavorable reversibility and sluggish kinetics. In this paper, we have improved the hydrogen storage properties of LiBH4 by doping with a porous Li3BO3 additive, which was prepared by a solid state synthesis method. The LiBH4-33 wt% Li3BO3 composite was prepared via mechanical milling. The composite exhibited an acceptable hydrogenation/dehydrogenation rate, high hydrogen storage capacity and superior reversibility. The initial dehydrogenation temperature of the composite was 105 degrees C, which is 205 degrees C lower than that of the pristine LiBH4, and the hydrogen desorption capacity was 4.12 wt% at 450 degrees C within 2000 s. The composite maintained its hydrogen absorption capacity of 2.8 wt% with a narrow gap after 5 de/hydrogenation cycles at 400 degrees C and 5.0 MPa. The Li3BO3 additive clearly enhanced the hydrogen storage properties of LiBH4 and facilitated the decomposition and formation of [BH4](-), thus accelerating de/rehydrogenation of LiBH4. At the same time, Li3BO3 offered numerous porous channels that enhanced hydrogen circulation. (C) 2016 Elsevier B. V. All rights reserved.
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