Abstract
Developing efficient catalysts is of great significance in improving the sluggish kinetics and high desorption temperature of MgH2 hydrogen storage material. Here, ultrathin NiTi-layered double hydroxide (NiTi-LDH) nanosheets are used as precursors to prepare Mg2Ni/TiH1.5 composite catalysts to improve the hydrogen storage properties of MgH2. The variation of Ni/Ti ratio in LDH plays an important role in regulating the composition, morphology and distribution of Mg2Ni/TiH1.5 catalysts, which significantly affect their synergistic catalytic effect. Mg2Ni/TiH1.5 composite catalyst exhibits significantly improved catalytic performance compared with conventional Ni-, Ti- and Ni/Ti-based catalysts. The optimal MgH2/Mg2Ni/TiH1.5 system shows a significantly reduced desorption temperature of 212 °C which is 133 °C lower than that of pure MgH2 (345 °C), and can release 5.97 wt% hydrogen within 300s at 300 °C. Further mechanism analysis reveals that the unique flaky morphology and suitable composition of Ni/Ti LDH can significantly enhance the synergistic effect of Mg2Ni and TiH1.5, which promotes the fracture of the HH and Mg-H bonds.
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