Journal
CHEMICAL PHYSICS LETTERS
Volume 700, Issue -, Pages 44-49Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2018.04.011
Keywords
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Funding
- National Natural Science Foundation of China [51471054]
- Natural Science Foundation of Beijing Municipality [2152019]
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Here we report the thermal properties and cycling performance of Ca(BH4)(2)/MgH2. The reaction enthalpy is 48 kJ mol (1) H-2 and equilibrium pressure at 350 degrees C is 0.4981 MPa. We add NbF5 into Ca(BH4)(2)/MgH2 to figure out the degradation mechanism because of its catalytic ability. Ca(BH4)(2)/MgH2 follows the dehydrogenation path to form CaH2, CaB6 and Mg. The degradation of Ca(BH4)(2)/MgH2 composite during cycling is due to the particle aggregation and the reduction of CaB6 product. NbF5 can promote the forming of CaB6 and prevent microstructural coarsening in Ca(BH4)(2)/MgH2 during cycling, which leads to better reversibility. (C) 2018 Elsevier B.V. All rights reserved.
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