Abstract
Abstract In this work, MgH 2 –SiC–Ni was prepared by magneto-mechanical milling in hydrogen atmosphere. Scanning electron microscope mapping images showed a homogeneous dispersion of both Ni and SiC among MgH 2 particles. Based on the differential scanning calorimetry traces, the temperature of desorption is reduced by doping MgH 2 with SiC and Ni. Hydrogen absorption/desorption behaviour of the samples was investigated by Sievert's method at 300 °C, and the results showed that both capacity and kinetics were improved by adding SiC and Ni. The hydrogen desorption kinetic investigation indicated that for pure MgH 2 , the rate-determining step is surface controlled and recombination, while for the MgH 2 –SiC–Ni sample it is controlled as described by the Johnson–Mehl–Avrami 3D model (JMA 3D).
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