Abstract
The rational design of catalysts is extraordinarily significant for facilitating the dehydrogenation kinetics of NaAlH4. Herein, CeF3 nanoparticles supported on Ti3C2 MXene (CeF3/Ti3C2) were successfully synthesized and applied to catalyze the hydrogen storage properties of NaAlH4. With the addition of 10 wt % CeF3/Ti3C2, the onset dehydrogenation temperature was lowered to 87 °C and more than 3.0 wt % H2 can be released at 140 °C within 6 min. Moreover, the composite exhibited wonderful stability and reversibility with 94.5% capacity retention after 10 cycles of continued tests. The compositional and structural analysis demonstrated that a Ti–F–Ce structure at the interface between CeF3 and Ti3C2 was formed and remained stable during the ball milling, urging the stabilization of Ti0 catalytic species in the hydrogenation/dehydrogenation of NaAlH4. The remarkably enhanced hydrogen storage behavior was attributed to the synergy effects of Ti0 species and the outstanding stable structure of Ti–F–Ce from the CeF3/Ti3C2 catalyst. The findings have widened the road for the rational design of high efficiency catalysts to improve the hydrogen storage performance of NaAlH4.
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