In this study, we used a combination of graphene oxide-based porous carbon (GC) and titanium chloride (TiCl
3) to improve the reversible dehydrogenation properties of magnesium hydride (MgH
2). Examining the effects of GC and TiCl
3 on the hydrogen storage properties of MgH
2, the study found GC was a useful additive as confinement medium for promoting the reversible dehydrogenation of MgH
2. And TiCl
3 was an efficient catalytic dopant. A series of controlled experiments were carried out to optimize the sample preparation method and the addition amount of GC and TiCl
3. In comparison with the neat MgH
2 system, the MgH
2/GC-TiCl
3 composite prepared under optimized conditions exhibited enhanced dehydrogenation kinetics and lower dehydrogenation temperature. A combination of phase/microstructure/chemical state analyses has been conducted to gain insight into the promoting effects of GC and TiCl
3 on the reversible dehydrogenation of MgH
2. Our study found that GC was a useful scaffold material for tailoring the nanophase structure of MgH
2. And TiCl
3 played an efficient catalytic effect. Therefore, the remarkably improved dehydrogenation properties of MgH
2 should be attributed to the synergetic effects of nanoconfinement and catalysis.
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