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The present study reports the catalytic action of two-dimensional (2D)layered materials (MoS2 and WS2) for improving the de/re-hydrogenation kineticsof MgH2. The MgH2 start desorbing at 277 C with a hydrogen storage capacity of5.95 wt% in the presence of WS2 catalyst whereas onset desorption temperatureof MgH2 catalyzed by MoS2 is 330 C. The MgH2-WS2 absorbed hydrogen ~ 3.72 wt%within 1.3 minutes at 300 C under 13 atm hydrogen pressure and it desorbed~5.57 wt% within 20 minutes at 300 C under 1 atm hydrogen pressure. We haveperformed 25 cycles of dehydrogenation (under 1 atm hydrogen pressure at 300 C)and re-hydrogenation (under 13 atm hydrogen pressure at 300 {\deg}C) to ensurecyclic stability of catalyzed version of MgH2 where MgH2-WS2 shows bettercyclic stability than MgH2-MoS2. MgH2-WS2 also shows the lower reactionactivation energy ~117 kJ/mol as compare to other catalyzed and uncatalyzedsamples. On the other hand, these catalysts (WS2 and MoS2) do not have anyimpact on the thermodynamical parameters that is change in enthalpy.

Catalytic action of two-dimensional layered materials (WS2, and MoS2) on hydrogen sorption properties of MgH2