The Influence of Cerium on the Hydrogen Storage Properties of La 1-x Ce x Ni 5 Alloys

Magda Pęska, Julita Dworecka-Wójcik, Tomasz Płociński and Marek Polański
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Magda Pęska: Department of Functional Materials and Hydrogen Technology, Military University of Technology, 00-908 Warsaw, Poland
Julita Dworecka-Wójcik: Department of Functional Materials and Hydrogen Technology, Military University of Technology, 00-908 Warsaw, Poland
Tomasz Płociński: Faculty of Materials Science and Engineering, Warsaw University of Technology, 02-507 Warsaw, Poland
Marek Polański: Department of Functional Materials and Hydrogen Technology, Military University of Technology, 00-908 Warsaw, Poland

Energies, 2020, vol. 13, issue 6, 1-13

Abstract: La 1-x Ce x Ni 5 alloys (x = 0, 0.09, 0.25 and 0.5) were investigated in terms of their structures, phase contents, hydrogen storage properties and microhardness. It was confirmed that a cerium addition to the reference (LaNi 5 ) alloy caused structural changes such as lattice shrinkage and, as a result, changed both the absorption and desorption pressures and the enthalpies of formation and decomposition. The alloy with the highest cerium content was found to possess a two-phase structure, probably as a result of nonequilibrium cooling conditions during its manufacturing process. The microhardness was found to increase to some extent with the cerium content and decrease for samples with the highest cerium content.

Keywords: LaNi 5; cerium; isotherms; hydrogen storage; equilibrium pressures (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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