Achieving Wide-Temperature-Range Physical and Chemical Hydrogen Sorption in a Structural Optimized Mg/N-Doped Porous Carbon Nanocomposite

The as-synthesized rN-pC exhibited H 2 uptake of ~0.9 wt% at 77 K and ultralow pressure of ~0.1 bar, with an isosteric adsorption enthalpy (Q st ) of ~14 kJ mol -1 H 2 at zero coverage. The 60MgH 2 @rN-pC started to decompose at 175 °C and released H 2 of 3.38 wt% at 300 °C within 30 min, which showed outstanding desorption kinetics of MgH 2 among Mg-carbon material nanocomposites. The drawback of nanoconfinement scaffolds that cannot store hydrogen was firstly overcome.