Improving the efficiency of hydrogen storage in LaNi₅-based materials through cobalt modification

Arman Miniyazov; Mazhyn Skakov; Nuriya Mukhamedova; Mikhail Skopchenko; Ospan Oken; Aisara Sabyrtayeva; Igor Sokolov; Anar Nassyrova; Arman Miniyazov; Mazhyn Skakov; Nuriya Mukhamedova; Mikhail Skopchenko; Ospan Oken; Aisara Sabyrtayeva; Igor Sokolov; Anar Nassyrova

doi:10.3934/energy.2025053

AIMS Energy

2025, Volume 13, Issue 6: 1417-1431. doi: 10.3934/energy.2025053

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Research article

Improving the efficiency of hydrogen storage in LaNi₅-based materials through cobalt modification

1.
National Nuclear Centre RK, Kurchatov, 071100, Kazakhstan
2.
Department of Technical Physics and Heat Power Engineering, Shakarim University, Semey 071410, Kazakhstan
3.
S.Amanzholov East Kazakhstan University, Ust-Kamenogorsk, 070004, Kazakhstan

Received: 29 August 2025 Revised: 28 October 2025 Accepted: 18 November 2025 Published: 24 November 2025

This paper investigated the effect of cobalt on hydrogen storage in the intermetallic compound LaNi₅. Phase composition and hydrogen absorption properties of the LaNi₅–хCo_х 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.
- metal hydride,
- hydrogen storage,
- LaNi₅,
- cobalt,
- spark plasma sintering
Citation: Arman Miniyazov, Mazhyn Skakov, Nuriya Mukhamedova, Mikhail Skopchenko, Ospan Oken, Aisara Sabyrtayeva, Igor Sokolov, Anar Nassyrova. Improving the efficiency of hydrogen storage in LaNi₅-based materials through cobalt modification[J]. AIMS Energy, 2025, 13(6): 1417-1431. doi: 10.3934/energy.2025053

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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–хCo_х 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.

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