Solid gas and electrochemical hydrogenation properties of the selected R,R’MgNi4-xMx (R,R’ = La, Pr, Nd; M = Fe, Mn; x = 0.5, 1) alloys

Yuriy Verbovytskyy; Yuriy Kosarchyn; Ihor Zavaliy

doi:10.17721/fujcV8I2P126-139

Authors

Yuriy Verbovytskyy KARPENKO PHYSICO-MECHANICAL INSTITUTE OF THE NAS OF UKRAINE
Yuriy Kosarchyn
Ihor Zavaliy

DOI:

https://doi.org/10.17721/fujcV8I2P126-139

Keywords:

alloys, intermetallics, hydrides, phase composition, hydrogenation

Abstract

New R,R’MgNi_4-xM_x (R,R’ = La, Pr, Nd; M = Fe, Mn; x = 0.5, 1) phases with cubic structure have been synthesized by powder sintering method. By the hydrogenation of the parent alloys seven hydrides with cubic (LaMgNi_3.5Fe_0.5H_6.0, PrMgNi_3.5Mn_0.5H_~6 and NdMgNi_3.5Mn_0.5H_~5) and orthorhombic (PrMgNi_3.5Fe_0.5H_4.5, NdMgNi_3.5Fe_0.5H_4.3, La_0.5Pr_0.5MgNi_3.5Fe_0.5H_4.6 and La_0.5Nd_0.5MgNi_3.5Fe_0.5H_4.4) structures were obtained. The relationship between the structure, hydrogen content and the relative increase of the lattice volume of the new and early known hydrides is shown. Electrochemical parameters of the electrodes based on new materials are compared with already known ones. Highest discharge capacity is observed for PrMgNi_3.5Mn_0.5 (271 mAh/g) and NdMgNi_3.5Mn_0.5 (263 mAh/g). The best cyclic stability was seen for the electrode based on NdMgNi_3.5Fe_0.5 (S₅₀ = 74%).

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