Microstructure and hydrogen storage properties of MgH2–TiB2–SiC composites

Abstract The influence of TiB 2 and SiC ceramics on H-desorption kinetics from MgH 2 based composites was investigated and correlated with the microstructure and morphology of the composites. The mechanism of desorption and the activation energy for desorption was investigated by applying non-isothermal kinetic analysis of thermodesorption spectra. It has been shown that TiB 2 addition leads to significant decrease of the activation energy for desorption, while SiC addition has effect on the interface reaction between hydride and hydroxide. The mechanism of desorption change from Avrami–Erofeev n =3 for pure MgH 2 to Avrami–Erofeev n =4 for composite materials. The change from 3 to 4 can be due to the modification of the nucleation process or a change in the dimensionality of the growth. Those high values of n discard a diffusion control as a rate limiting step.