N/S Co-doped Nb2CTx MXene as the effective catalyst for improving the hydrogen storage performance of MgH2

•N/S-Nb2CTx catalyst improves hydrogen storage properties of MgH2.•The composite can release 4.78 wt.% of H2 within 30 min at 225°C.•Dehydrogenation activation energy of the composite is 47.44% reduced than MgH2.•The energy barrier of hydrogen atom diffusion is reduced by the N/S co-doped.•The composite has the excellent cycling stability within 30 cycles.