Crystal structure and hydrogen storage properties of (La,Ce)Ni5-xMx (M=Al, Fe, or Co) alloys

Wan-liang Mi; Zhao-sen Liu; Toru Kimura; Atsunori Kamegawa; Hai-liang Wang

doi:10.1007/s12613-019-1714-z

Volume 26 Issue 1

Jan. 2019

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International Journal of Minerals, Metallurgy and Materials > 2019 > 26(1): 108-113. > DOI: 10.1007/s12613-019-1714-z

Wan-liang Mi, Zhao-sen Liu, Toru Kimura, Atsunori Kamegawa, and Hai-liang Wang, Crystal structure and hydrogen storage properties of (La,Ce)Ni_5-xM_x (M=Al, Fe, or Co) alloys, Int. J. Miner. Metall. Mater., 26(2019), No. 1, pp.108-113. https://dx.doi.org/10.1007/s12613-019-1714-z

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Research Article

Crystal structure and hydrogen storage properties of (La,Ce)Ni_5-xM_x (M=Al, Fe, or Co) alloys

Author Affilications

School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
Research Center for Environmentally Friendly Materials Engineering(Muroran MATERIA), Muroran Institute of Technology, Muroran 0508585, Japan

Funds:

This work was partially supported by International Academic Exchange Program of Muroran Institute of Technology, Muroran (Japan) and University of Science and Technology Beijing, Beijing (China) and Environmentally Friendly Materials Education Program provided by Muroran MATERIA. This work was also supported by Beijing Key Laboratory of Energy Conservation and Emission Reduction for Metallurgical Industry, Beijing, China.

Received: 08 March 2018; Revised: 26 May 2018; Accepted: 10 June 2018;

Graphical Abstract

Abstract

Abstract

The effects of partial substitution of La by Ce and Ni by Al, Fe, or Co in LaNi₅-based alloys on hydrogen storage performance were systematically studied. All samples were prepared using vacuum arc melting in an argon atmosphere. The results showed that for La-Ni_5-xM_x (M=Al, Fe, or Co) alloys, the lattice constants and unit cell volumes increased with an increasing amount of Al and Fe. On the other hand, these parameters decreased upon partial substitution of La by Ce. In addition, the lattice constant remained almost constant in the La_0.6Ce_0.4Ni_5-xCo_x alloys regardless of the value of x (x=0.3, 0.6, or 0.9), as Ce might enhance the homogeneity of the CaCu₅-type phase in Co-containing alloys. The hydrogen storage properties of the alloys were investigated using pressure, composition, and temperature isotherms. The experimental results showed that the plateau pressure decreased with an increasing content of Al, Fe, or Co, but it increased with Ce addition. Furthermore, the plateau pressures of all Co-containing alloys were almost identical upon substitution with Ce. Finally, the enthalpy (ΔH) and entropy (ΔS) values for all alloys were calculated using van't Hoff plots. The relationship between the lattice parameters and enthalpy changes for hydrogenation will be discussed.
- metal hydride,
- LaNi₅,
- hydrogen storage alloys,
- partial substitution,
- P-C-T curves,
- thermodynamics

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References (17)

References

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