Solid gas and electrochemical hydrogenation of the selected alloys (R′,R)2-xMgxNi4-yCoy (R′, R = Pr, Nd; x=0.8-1.2; y=0-2)

JOURNAL OF ALLOYS AND COMPOUNDS

卷:876

Article

Verbovytskyy, Yuriy¹  Oprysk, Volodymyr¹  Paul-Boncour, Valerie²  Zavaliy, Ihor¹  Berezovets, Vasyl¹  Lyutyy, Pavlo¹  Kosarchyn, Yuriy¹ 

[1] NAS Ukraine, Karpenko Physicomech Inst, 5 Naukova St, UA-79060 Lvov, Ukraine

[2] Univ Paris Est Creteil, CNRS, ICMPE, UMR 7182, F-94320 Thiais, France

关键词: Rare earth and magnesium alloys;    Hydrides;    Electrochemical properties;   

DOI  :  10.1016/j.jallcom.2021.160155

来源: Elsevier

【 摘 要 】

A number of alloys with the (R', R'')(2-x)MgxNi4-yCoy (R', R'' = Pr, Nd; x = 0.8-1.2; y = 0-2) compositions were synthesized by the sintering method and characterized by X-ray powder diffraction method. They are all with cubic MgCu4Sn structure and belong to the continuous solid solution. Gas hydrogenation was performed for the selected alloys and 15 new hydrides belonging to cubic or orthorhombic structures were obtained. PCT diagrams are constructed for the Nd1.2Mg0.8Ni3Co - H-2 and Nd0.8Mg1.2Ni3Co - H-2 systems. The influence of R/Mg and Ni/Co substitution on the discharge characteristics of the (R', R'')(2-x)MgxNi4-yCoy electrodes was studied. It was established that cobalt-doped alloys with high magnesium content show the highest discharge capacities. (C) 2021 Elsevier B.V. All rights reserved.

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