One-step self-assembly of TiO2/MXene heterostructures for improving the hydrogen storage performance of magnesium hydride

•TiO2/MXene heterostructure was fabricated via one-step self-assembly.•The heterostructure can effectively improve the hydrogen storage property of MgH2.•The heterostructure generates rich interfaces between TiO2 and MXene.•Interfaces provide H diffusion channels and electron transfer, enhancing catalysis.