Bimetallic Ti 2 NbC 2 MXene as an efficient catalyst for reversible hydrogen storage in magnesium hydride

Abstract Magnesium hydride (MgH 2 ) was highly regarded for its substantial hydrogen storage capacity of up to 7.6 wt%, but its commercial application was hindered by the high operating temperatures and slow kinetics. In this study, the successful synthesis of the layered Ti 2 NbC 2 has significantly enhanced the hydrogen storage performance of MgH 2 . MgH 2 + 5 wt% Ti 2 NbC 2 began to release hydrogen at 190 °C and started to absorb hydrogen at room temperature. At a constant temperature of 275 °C, complete hydrogen release was achieved in just 250 s, up to 6.9 wt%. At 150 °C, the absorption of hydrogen reached 6.59 wt% within 200 s, and the hydrogen absorption activation energy was reduced to 41.517 ± 3.981…

• NN
  National Natural Science Foundation of China

  Award: 52201255
• NS
  Natural Science Foundation of Jiangsu Province

  Award: BK20210884