Over saturated metallic-Mg-ions diffused hollow carbon nano-spheres/Pt for ultrahigh-performance hydrogen storage

•Fabricated Mg/HCNS/Pt system has H2-desorption release capacity of ∼7.85 wt%.•Ball milling was successfully applied to disperse Mg/Pt-nano-powders into HCNS.•Mg/HCNS/Pt system can release hydrogen 7.85 wt% at 370 °C in 1.42 min.•MgH2-storage capacity has extraordinary BET surface area of 1810 m2g−1. The newly synthesized ternary system are consisting of metallic-Mg-ions diffused in hollow carbon nano-spheres (HCNS) that embedded with platinum nano-particles (NP). The ternary system exhibits characteristics features in hydrogen release. It is expected to be superior and efficient as hydrogen carrier to be used for energy release applications. The synthesized Mg/HCNS/Pt ternary system was well characterized by both of XRD and 3D-AFM. The measured H2-desorption capacities were promising values recording 6.78, 6.92, 7.05 and 7.85 wt% at temperatures 270, 300, 330 and 370 °C respectively. These results confirmed that MgH2-storage capacity was enhanced and reinforced by extraordinary BET surface area of 1810 m2 g−1 attributable to (HCNS + Pt-NP + Mg − NP). The kinetics of desorption results indicated that Mg/HCNS/Pt composite can release hydrogen 7.85 wt% at 370 °C in 1.42 min (85.2 s) and minimum desorption capacity observed was 6.78 wt% at 270 °C in 2.8 min (168 s).