Hydrogen storage characteristics of magnesium impregnated on the porous channels of activated charcoal scaffold

Ball milled (30 h) MgH2 is impregnated on the pores/grooves of activated charcoal scaffold using a programmed heat treatment at 550 °C under 5 bar pure hydrogen ambient. The result obtained by this approach is better and more consistent than the materials prepared by metal infiltration at 650 °C or vacuum heated samples under 550 °C. The activation energy value (88 kJ/mol) obtained in the case of impregnated catalyst free material is far better than the activation energy value of the unconfined material (149 kJ/mol). The impregnated material can absorb hydrogen almost closer to its actual capacity at ∼1 bar under 170 °C. The low temperature desorption characteristics and ab/desorption behaviors are extensively analyzed and described.