Abstract
Abstract Intensive mechanical milling was used to synthesize a MgH 2 (50 wt.%) + TiB 2 (50 wt.%) composite. Thermal stability of the composite versus H-desorption was studied employing the thermodesorption spectroscopy (TDS) method. The TDS data have revealed that TiB 2 addition decreases the dissociation temperature of the MgH 2 hydride by about 50 °C. An X-ray photoelectron spectroscopy analysis has shown that TiB 2 addition does not alter the surface chemical state of particles of the MgH 2 hydride, a component of the composite under consideration. The effect of decreasing decomposition temperature of MgH 2 due to addition of TiB 2 has been attributed to catalytic influence of a TiB 2 particle surface on processes of associative hydrogen desorption taking place on the surface of MgH 2 particles, as well as to a higher degree of dispersion of magnesium dihydride provided by the presence of TiB 2 .
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