Abstract
Dehydriding and rehydriding properties of well-crystallized Mg(BH 4) 2 were systematically investigated by thermogravimetry (TG) and pressure–composition–temperature (PCT) measurements. The dehydriding reaction of Mg(BH 4) 2 starts at approximately 500 K, and about 14.4 mass% of hydrogen is desorbed according to the following multi-step reaction: Mg(BH 4) 2 → some intermediate compounds → MgH 2 + 2B + 3H 2 → Mg + 2B + 4H 2 The apparent enthalpy change in the dehydriding reaction from Mg(BH 4) 2 to MgH 2 is estimated to be 57 ± 5 kJ mol −1 H 2 based on the result of the PCT measurement. It is proved that approximately 6.1 mass% of hydrogen can be reversibly stored for the sample of Mg(BH 4) 2 after the dehydriding reaction, through the formation of a possible intermediate compound such as MgB 12H 12.
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