期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 116, 期 12, 页码 7207-7212出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp211620h
关键词
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资金
- European Community [226943- FLYHY]
- LNLS [D04B-XAFS1-9865]
A reactive hydride composite (RHC) with initial composition 3CaH(2) + 4MgB(2) + CaF2 was studied by in situ synchrotron radiation powder X-ray diffraction (SR-PXD) and X-ray absorption near edge structure (XANES) at the B K-edge and at the Ca K-edge. The hydrogenation reaction proceeds by an unknown intermediate. No evidence of intermediates was observed during the dehydrogenation reaction. B and Ca K-edge XANES results hint to a closed interaction of CaF2 and Ca(BH4)(2). The main function of CaF2 in the 3CaH(2) + 4MgB(2) + CaF2 RHC is as a dopant for the hydrogenation and dehydrogenation reactions.
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