The launch of International Thermonuclear Experimental Reactor project paves the way to wide adoption of DT fusion energy as future energy source. Efficient fuel cycle to minimize strategic tritium inventory proves crucial for commercially viable fusion technologies. ZrCo alloy is considered as a promising candidate for fast isotope handling. However, cycling degradation caused by hydrogen-induced disproportionation results in severe tritium trapping, thus impeding its practical application. Herein, an isostructural transition is successfully constructed with low hysterisis, ameliorated plateau flatness of pressure-composition isotherms and improved high-temperature durability for hydrogen trapping minimization. Specifically, the optimal Zr_0.7Hf_0.15Nb_0.15Co_0.6Cu_0.15Ni_0.25 alloy adopts Hf-Nb and Cu-Ni as Zr and Co side doping elements, exhibiting substantial thermodynamic destabilization with nearly 90 ℃ reduction of delivery temperature, and significant kinetic promotion with a threefold lower energy barrier. More importantly, both hydrogen utilization and cycling retention of optimal alloy are increased by about twenty times compared with pristine alloy after 100 cycles at 500 ℃. Minimized disproportionation driving force from both isostructural transition and suppressed 8e hydrogen occupation realizes full potential of optimal alloy. This work demonstrates the effectiveness of combining isostructural transformation and high-temperature durability improvement to enhance the hydrogen utilization of ZrCo-based alloys and other hydrogen storage materials.

The lattice distortion effect and cocktail effect of high-entropy oxides (HEOs) will dominate the catalytic effect of the materials, in order to study the influence of the constituent elements of HEOs on the lattice distortion effect and cocktail effect, through elemental manipulation of Cr, Cu, and La, high entropy oxides (HEOs) catalyst CrMnFeCoNiO (Cr_1:1), CuMnFeCoNiO (Cu_1:1), and LaMnFeCoNiO (La_1:1) were effectively synthesized by the facile co-precipitation approach. With a size of about 10 nm, Cr_1:1 presented significant modification impacts on enhancing the hydrogen storage capability of MgH₂. Specifically, MgH₂ was able to release hydrogen at 200 ℃ with the addition of Cr_1:1, MgH₂+10wt% Cr_1:1 showed prompt rate of dehydrogenation which could release 5.56 wt% H₂ in 20 min at 250 ℃, and the activation energy of MgH₂ was lowered to 69.77± 3.75 kJ·mol⁻¹ by adding Cr_1:1. According to the Chou model fitting, the exceptional kinetic performance of the composite was attributable to a rate-controlling step changed from low-speed surface penetration to high-speed diffusion. Furthermore, MgH₂+10wt% Cr_1:1 was capable of absorbing hydrogen at ambient temperature and the composite could uptake 6 wt% H₂ within 8 min at the temperature of 150 ℃. Due to the high entropy effects of HEOs, Cr_1:1 possessed superior stability, which guarantees the robust cycling qualities of MgH₂+10wt% Cr_1:1. Meanwhile, microstructure analysis revealed that the active sites with numerous heterogeneous structures were uniformly dispersed on surfaces, exhibiting superior catalytic effects on improving the hydrogen storage performance of MgH₂.