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At present, catalyst doping has been widely concerned by researchers as an effective method to improve the hydrogen storage performance of MgH 2. Herein, it is confirmed that MnMoO 4 rod catalyst can effectively improve the hydrogen storage performance of MgH 2. According to the experimental results, MgH 2 +10 wt%MnMoO 4 composite material starts dehydrogenation at about 220 °C, which is about 140 °C lower than MgH 2 without additives. The initial dehydrogenation capacity of 6 wt% can be reached within 10min at 300 °C. After complete dehydrogenation, H 2 can be absorbed below 55 °C, and 4.34 wt% H 2 can be absorbed within 15 min at 150 °C and 3 MPa hydrogen pressure. In addition, the activation energy of dehydrogenation of MgH 2 decreased about 45 kJ mol−1. Furthermore, hydrogen storage capacity of MgH 2 can still be maintained at 5.85 wt% after 20 cycles. The synergy between the in-situ formed Mn and MgMo 2 O 7 may help promote the dissociation and diffusion of H 2 along the Mg/MgH 2 interface, thereby improving the hydrogen storage performance of MgH 2. [Display omitted] • MgH 2 –MnMoO 4 composite system was reported for the first time. • MgH 2 +10 wt%MnMoO 4 composite material starts dehydrogenation at about 220 °C. • MgH 2 –MnMoO 4 composites showed promising kinetic properties. • MgO, Mn and MgMo 2 O 7 were formed in situ during the reaction. [ABSTRACT FROM AUTHOR]