Solid gas and electrochemical hydrogenation properties of the R1-xR’xMgNi4-yCoy (R, R’ = Y, La, Ce) alloys

Yu. V. Verbovytskyy; I. Yu. Zavaliy; V. V. Berezovets; P. Ya. Lyutyy

doi:10.15330/pcss.21.3.503-509

Authors

Yu. V. Verbovytskyy Karpenko Physico-Mechanical Institute, NAS of Ukraine
I. Yu. Zavaliy Karpenko Physico-Mechanical Institute, NAS of Ukraine
V. V. Berezovets Karpenko Physico-Mechanical Institute, NAS of Ukraine
P. Ya. Lyutyy Karpenko Physico-Mechanical Institute, NAS of Ukraine

DOI:

https://doi.org/10.15330/pcss.21.3.503-509

Keywords:

Rare Earth compounds, Magnesium compoun, Crystal structure, Hydrogen storage, Metal hydride electrodes

Abstract

New R_1-xR’_xMgNi_4-yCo_y (R, R’ = Y, La, Ce; x = 0.5; y = 0, 1, 2) alloys have been synthesized by powder sintering method, and their crystal structure and hydrogen storage properties have been studied. X-ray diffraction analysis showed that R_1-xR’_xMgNi_4-yCo alloys belong to the MgCu₄Sn-type structure. The synthesized alloys absorb hydrogen at room temperature and hydrogen pressure 0.1-10 bar. For some of the studied compounds, the formation of hydrides with cubic and orthorhombic structures was found. Highest hydrogen content is found for the Co-rich compounds: La₀_.5Y₀_.5MgNi₂Co₂H_5.18 and La₀_.5Ce₀_.5MgNi₂Co₂H_6.48. Electrochemical studies showed that Y-based electrode materials exhibit better electrochemical performance comparing with Ce-doped ones. Highest discharge capacity of 292 mА∙h/g was observed for La_0.5Y_0.5MgNi₃Co, but the best cyclic stability after 50^th cycle of 92% was seen for La_0.5Y_0.5MgNi₂Co₂. Additionally, obtained results of the electrochemical properties were compared with related compounds. High rate dischargeability of Co-free alloys at I = 1 A/g were twice higher than ones containing cobalt.

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