CaH2+4MgB2+CaF2 Reactive Hydride Composite as a Potential Hydrogen Storage Material: Hydrogenation and Dehydrogenation Pathway.

SUAREZ ALCANTARA, KARINA; JOSE MARTIN RAMALLO LOPEZ; BÖSENBERG, ULRIKE; SALDAN, IVAN; PISTIDDA, CLAUDIO; F.G. REQUEJO; JENSEN, TORBEN; CERENIUS, YNGVE; SØRBY, MAGNUS; AVILA, JOSÉ; BELLOSTA VON COLBE, JOSÉ; TAUBE, KLAUS; KLASSEN, THOMAS; DORNHEIM, MARTIN

JOURNAL OF PHYSICAL CHEMISTRY C

AMER CHEMICAL SOC

Lugar: Washington; Año: 2012 vol. 116 p. 7207 - 7212

1932-7447

A reactive hydride composite (RHC) with initial composition 3CaH2 + 4MgB2 + 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 3CaH2 + 4MgB2 + CaF2 RHC is as a dopant for the hydrogenation and dehydrogenation reactions.