Improvement of hydrogen storage performance of MgH2 by MnMoO4 rod composite catalyst

At present, catalyst doping has been widely concerned by researchers as an effective method to improve the hydrogen storage performance of MgH2. Herein, it is confirmed that MnMoO4 rod catalyst can effectively improve the hydrogen storage performance of MgH2. According to the experimental results, MgH2+10 wt% MnMoO4 composite material starts dehydrogenation at about 220 degrees C, which is about 140 degrees C lower than MgH2 without additives. The initial dehydrogenation capacity of 6 wt% can be reached within 10min at 300 degrees C. After complete dehydrogenation, H-2 can be absorbed below 55 degrees C, and 4.34 wt% H-2 can be absorbed within 15 min at 150 degrees C and 3 MPa hydrogen pressure. In addition, the activation energy of dehydrogenation of MgH2 decreased about 45 kJ molt . Furthermore, hydrogen storage capacity of MgH2 can still be maintained at 5.85 wt% after 20 cycles. The synergy between the in-situ formed Mn and MgMo2O7 may help promote the dissociation and diffusion of H-2 along the Mg/MgH2 interface, thereby improving the hydrogen storage performance of MgH2.

Automated summary

Catalyst doping with MnMoO4 has been shown to significantly enhance the hydrogen storage performance of MgH2, reducing dehydrogenation temperature, increasing hydrogen storage capacity, and maintaining high performance after 20 cycles. The synergy between Mn and MgMo2O7 may play a key role in promoting hydrogen dissociation and diffusion, improving the overall hydrogen storage performance of MgH2.