Identification of the Dehydrogenated Product of Ca(BH4)2

摘要: We have investigated the decomposition path and reversibility of Ca(BH4)2 + MgH2 composite using X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry, Raman spectroscopy. Formation CaB6 during dehydrogenation both systems was confirmed for first time. appears as broad peaks in diffraction data, but spectroscopy unambiguously captures existence CaB6. Reversibility catalyzed previously reported, here we demonstrate composite. Dehydrogenated product is composed CaH2, CaB6, Mg. About 60% achieved after rehydrogenation 24 h under 90 bar hydrogen pressure at 350 °C even without help catalysts, which makes a good contrast with case pure where almost negligible occurs same conditions. To understand difference, role Mg worth further investigation. Format...