Considering the onset dehydrogenationtemperature and isothermal de/rehydrogenation kinet-ics, the MgH 2 –10 wt% TiCN composite showed the bestperformance. The MgH 2 –10 wt% TiCN composite onlyneeded 61.8, 17.3 and 8.5 min to release 4 wt% hydrogenat 275, 300 and 325 °C, respectively. However, as-synthe-sized MgH 2 did not release any H 2 at 275 °C and 300 °C.