Abstract:The development of materials showing hydrogen sorption reactions close to room temperature and ambient pressure will promote the use of hydrogen as energy carrier for mobile and stationary large-scale applications. In the present study, in order to reduce the thermodynamic stability of MgH 2 , Ni has been added to form Mg 2 NiH 4 , which has been mixed with various borohydrides to further tune hydrogen release reactions. De-hydrogenation/re-hydrogenation properties of Mg 2 NiH 4 -LiBH 4 -M(BH 4 ) x (M = Na, K, Mg, Ca) systems have been investigated. Mixtures of borohydrides have been selected to form eutectics, which provide a liquid phase at low temperatures, from 110 • C up to 216 • C. The presence of a liquid borohydride phase decreases the temperature of hydrogen release of Mg 2 NiH 4 but only slight differences have been detected by changing the borohydrides in the eutectic mixture.
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