Hydrogen cycling in ?-Mg(BH<inf>4</inf>)<inf>2</inf> with cobalt-based additives
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Magnesium borohydride (Mg(BH<inf>4</inf>)<inf>2</inf>) is an attractive candidate as a hydrogen storage material due to its high hydrogen content and predicted favorable thermodynamics. In this work we demonstrate reversible hydrogen desorption in partially decomposed Mg(BH<inf>4</inf>)<inf>2</inf> which was ball milled together with 2 mol% Co-based additives. Powder X-ray diffraction and infrared spectroscopy showed that after partial decomposition at 285 °C, amorphous boron-hydride compounds were formed. Rehydrogenation at equivalent temperatures and hydrogen pressures of 120 bar yielded the formation of crystalline Mg(BH<inf>4</inf>)<inf>2</inf> in the first cycle, and amorphous Mg(BH<inf>4</inf>)<inf>2</inf> with other boron-hydrogen compounds upon the third H<inf>2</inf> absorption. Reversibility was observed in the samples with and without Co-based additives, although the additives enhanced hydrogen desorption kinetics in the first cycle. X-ray absorption spectroscopy at Co K-edge revealed that all the additives, apart from Co<inf>2</inf>B, reacted during the first desorption to form new stable species. This journal is
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