Enhanced thermal diffusivity and dehydrogenation of 2LiNH2MgH2 by doping with super activated carbon

Doping with the additives in metal-N-H system has been regarded as one of the most effective approaches to improve its hydrogen storage properties. Herein, we prepared super activated carbon (SuperC) through the activation of commercial activated carbon by KOH and evaluated its effect on dehydrogenation properties of 2LiNH2MgH2. Our studies show that doping with SuperC could effectively lower its dehydrogenation temperatures. For instance, 2LiNH2MgH2-10 wt% SuperC can release 4.86 wt% of hydrogen upon heating up to 300 °C with the onset and peak dehydrogenation temperatures of 71 °C and 168 °C, respectively. Moreover, the release of byproduct NH3 was successfully suppressed. Measurement of thermal diffusivity suggests that the enhanced dehydrogenation properties may be ascribed to the improved heat transfer for solid-solid reaction resulting from doping with SuperC.