Heterostructured VF4@Ti3C2 catalyst improving reversible hydrogen storage properties of Mg(BH4)2

For solid-state hydrogen storage, Mg(BH4)2 has long been recognized as a promising material. However, its higher thermal stability is distant from conditions for practical application. Herein, it is effectively established that VF4 nanoparticles anchored on 2D Mxene Ti3C2 (VF4@Ti3C2) have efficiently catalytic effects towards the hydrogen storage process of Mg(BH4)2. The MBH-VF4@Ti3C2 sample started releasing hydrogen at 90 degrees C, which was 182 degrees C and 55 degrees C lower than those of additive-free Mg(BH4)2 and MBH-20Ti3C2 composites. Additionally, the MBH-20VF4@Ti3C2 composite desorbed more than 8 wt% H2 at 275 degrees C. The activation energies of dehy-drogenation were reduced, and the improved reversibility of VF4@Ti3C2-doped Mg(BH4)2 was also discussed. According to microstructural study, the heterostructural VF4@Ti3C2 interacted with Mg(BH4)2 to produce VH2.01 and metallic Ti during re/dehydrogenation, which worked as active species to improve hydrogen storage per-formance in Mg(BH4)2.

Automated summary

It has been discovered that VF4 nanoparticles anchored on 2D Mxene Ti3C2 effectively catalyze the hydrogen storage process of Mg(BH4)2, leading to lower release temperatures and higher hydrogen desorption. The interaction between VF4@Ti3C2 and Mg(BH4)2 produces VH2.01 and metallic Ti, which act as active species to improve hydrogen storage performance in Mg(BH4)2.