TiVNb-based high entropy alloys as catalysts for enhanced hydrogen storage in nanostructured MgH₂

Abstract

The superior catalytic activity of TiVNb-based high entropy alloys enhanced the reversible hydrogen storage and low-temperature hydrogenation properties of MgH2.

In situ creation of a catalytic multiphase and multiscale surroundings for remarkable hydrogen storage performance of MgH2

“…The optimal MgH 2 -10 wt% TiVNbZrFe sample started releasing hydrogen at ∼200 °C and the fully desorbed sample absorbed ∼3.3 wt% hydrogen within 120 minutes at room temperature. 49 These results indicated the synergistic effects of the metal elements existing in intermetallics for the hydrogen storage reaction of MgH 2 . 50 In this regard, ZrFe 2 is also expected to be as highly catalytic as a conventional AB 2 -type hydrogen storage alloy.…”

Recent Development and Future Perspectives of High Entropy Alloys for Catalysts

“…Co‐Mo is considered as an efficient catalyst for catalytic ammonia decomposition, and the miscibility gap between metals greatly affects the catalytic ability. [ 97–99 ] Xie and colleagues designed a CoMoFeNiCu HEA nanoparticle with different Co‐Mo ratios as a catalyst for hydrogen storage and efficient catalytic ammonia decomposition. [ 60 ] By changing different Co‐Mo ratios to reduce the miscibility gap of each metal and increase the catalytic active sites, the catalytic efficiency can be improved.…”

Understanding and unlocking the role of V in boosting the reversible hydrogen storage performance of MgH2

“…9,10 To date, the introduction of transition metal based catalysts that have a unique 3d electronic structure, especially V-based compounds, is regarded as one of the most effective strategies to enhance the hydrogen storage performance of MgH 2 . [10][11][12][13][14][15][16][17][18] It has been widely veried that transition metal-based catalysts could alleviate the dissociation energy of hydrogen on the surface of Mg, which would signicantly improve the hydrogen adsorption kinetics of Mg. [19][20][21][22][23][24][25] The interaction between the unsaturated d electrons of transition metals and the H 1s electron, on the other hand, could weaken the Mg-H bonds of MgH 2 , which would enhance the hydrogen desorption performance of MgH 2 . [26][27][28][29][30] As a result, various strategies have been proposed to further realize and improve the catalytic effect of Vbased catalysts, e.g., the building of nanostructured catalysts, [31][32][33] the construction of bimetallic catalytic systems, etc.…”