Fig. 4 Investigations on multiple valence titanium mechanism: (a) MgH2-Ni/TiO2. Reproduced with permission [95]. Copyright 2019, Elsevier. (b) MgH2+fl-TiO2@C. Reproduced with permission [96]. Copyright 2019, Elsevier. (c-e) XPS characterization of various materials before and after dehydrogenation. Reproduced with permission [97]. Copyright 2022, Elsevier. (f) Ti3C2-based MgH2 at different states. Reproduced with permission [98]. Copyright 2021, Elsevier. (g) Ti and Ni in MgH2 hydrogen storage system. Reproduced with permission [99]. Copyright 2018, American Chemical Society. (h) MgH2/TiO2. Reproduced with permission [93]. Copyright 2022, Springer. (i) NbN doped MgH2. Reproduced with permission [100]. Copyright 2020, Elsevier.
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