Abstract
The desorption mechanism of as-milled 2NaBH 4 + MgH 2 was investigated by volumetric analysis, X-ray diffraction and electron microscopy. Hydrogen desorption was carried out in 0.1 bar hydrogen pressure from room temperature up to 450 °C at a heating rate of 3 °C min −1. Complete dehydrogenation was achieved in two steps releasing 7.84 wt.% hydrogen. Desorption reaction in this system is kinetically restricted and limited by the growth of MgB 2 at the Mg/Na 2B 12H 12 interface where the intermediate product phases form a barrier to diffusion. During desorption, MgB 2 particles are observed to grow as plates around NaH particles.
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