Abstract
This paper investigated the effect of cobalt on hydrogen storage in the intermetallic compound LaNi₅. Phase composition and hydrogen absorption properties of the LaNi₅–хCoх system were analyzed using X-ray diffraction. The results demonstrated the retention of the hexagonal AB₅-type structure upon substitution of nickel atoms with cobalt atoms, accompanied by minor changes in lattice parameters and the formation of the LaNi₄Co phase. Hydrogen absorption studies revealed an increase in the material's capacity to 1.9% and a reduction in the time required to reach 90% of the equilibrium concentration to 2–3 minutes. These findings indicate that cobalt modification is an effective method to enhance hydrogen storage efficiency.