Electrochemical hydrogenation of solid solutions based on the intermetallic compound SmNi5

Kordan, V.; Tarasiuk, Ivan; Stetskiv, Iryna; Serkiz, R.; Pavlyuk, Volodymyr

doi:10.30970/cma12.0396

Cited by 2 publications

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“…The cell parameters changed from a = 4.9324(3), c = 3.9746(3) Å (before hydrogenation) to a = 4.986(2), c = 3.973(2) Å (after hydrogenation), cell volume increased from 83.74(1) to 85.54(6) Å 3 . An electrode based on a two-component Tb16,7Co83,3 alloy demonstrates similar electrochemical behaviour, but we observe a much higher nominal discharge voltage after doping by Li and Si, as in the case of indium and zinc alloying components [24,25]. Slightly broad peaks observed on the diffraction pattern after electrochemical hydrogenation (Fig.…”

Section: Resultssupporting

confidence: 51%

Synthesis, crystal structure and physical properties of the TbCo4.5SixLi0.5-x solid solution

Stetskiv

Kordan

Tarasiuk

et al. 2021

Phys. Chem. Solid St.

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Alloys from the region of existence of the solid solution TbCo4.5SixLi0.5-x were synthesized by arc melting. Quantitative and qualitative composition of alloys and powders of electrode materials was determined by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The Tb/Co/Si ratio in the samples was confirmed by X-ray fluorescence spectroscopy. The change in cell parameters within the solid solution existence was established by the results of X-ray powder diffraction (TbCo4.5SixLi0.5-x, x = 0.1–0.4: a = 4.9518(5) – 4.9324(3), c = 3.9727(4) – 3.9746(3) Å). The crystal structure of the solid solution was determined by the Rietveld method (CaCu5 structure type, space group P6/mmm). Cobalt atoms are partially replaced by silicon and lithium only in 2c position. The ability of alloys to reversibly absorb hydrogen was studied by the method of electrochemical hydrogenation. Under experimental conditions the amount of deintercalated hydrogen was about 0.19 H/f.u. The change in cell parameters after hydrogenation (volume increases from 83.74(1) to 85.54(6) Å3) and the stability of the electrode in the electrolyte solution was further confirmed by X-ray phase analysis. Measurements of the electrical resistivity of the samples indicated a decrease of resistivity value with a slight increase in the amount of alkali metal in samples.

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Section: Resultssupporting

confidence: 51%

Synthesis, crystal structure and physical properties of the TbCo4.5SixLi0.5-x solid solution

Stetskiv

Kordan

Tarasiuk

et al. 2021

Phys. Chem. Solid St.

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“…The sorption ability and electrochemical properties of the electrode materials constructed on the basis of R 2 T 17 and RT 5 phases can be improved by doping the binary compounds with other elements. In our previous works [15,16,18,19] we confirmed the positive influence of s-, p-and d-elements on the electrochemical hydrogenation of the compounds Tb 2 Ni 17 and TbCo 5 . Doping pure magnesium with lithium and aluminum promotes hydrogen desorption, improves corrosion resistance and hydrogen mobility into the solid phase of the electrode [20,21].…”

Section: Introductionsupporting

confidence: 67%

“…Here we selected an optimal current density at charging of 1.0 mA/cm 2 for 5 h in galvanostatic regime, because a larger current very quickly destroys the crystalline electrode and the amorphous electrode is oxidized to individual oxides. Similar experiments were carried out with electrodes based on SmNi 5 solid solutions [18]. Selected discharge curves with longer discharge time for the battery prototypes based on R 2 Zn 17-x Mn x are presented in Fig.…”

Section: Resultsmentioning

confidence: 75%

“…The octahedral voids are the first to be occupied by H-atoms, forming a coordination polyhedron [HR 2 M 4 ], because of geometrical and coordination reasons. The H-atoms have the same coordination in the CaCu 5 -type structure [18]. Occupation of the tetrahedral voids with the center in a position 12i occurs only for higher H content (more than 3 H/f.u.…”

Section: Introductionmentioning

confidence: 94%

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Electrochemical hydrogenation of the R2Zn17-xMnx phases (R = Y, La, Gd, Tb)

CHORNA,

KORDAN,

NYTKA

et al. 2020

Chem. Met. Alloys

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The electrochemical hydrogenation of the solid solutions R 2 Zn 17-x Mn x , x = 0.5-0.9 (R = Y, La, Gd, Tb) was studied in Ni-MH battery prototypes for the first time. Phase analysis of the electrode materials on the basis of these compounds was carried out before and after hydrogenation by X-ray powder diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray fluorescence spectroscopy. All the majority phases crystallize in the hexagonal Th 2 Ni 17 -type structure. As electrodes the alloys showed similar electrochemical behavior and the amount of deintercalated hydrogen increased in the order La < Y < Gd < Tb. The largest degree of amorphization and formation of oxides, such as ZnO and R 2 O 3 , were observed for the Y-and La-containing alloys after 50 cycles of hydrogenation/dehydrogenation. The geometrically most advantageous sites are octahedral voids in Wyckoff position 6h of the initial structures with a coordination polyhedron [HR 2 (Zn,Mn) 4 ] for the H-atom. Solid solution / Th 2 Ni 17 -type structure / Electrochemical hydrogenation / Ni-MH battery

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Electrochemical hydrogenation of solid solutions based on the intermetallic compound SmNi5

Cited by 2 publications

References 0 publications

Synthesis, crystal structure and physical properties of the TbCo4.5SixLi0.5-x solid solution

Synthesis, crystal structure and physical properties of the TbCo4.5SixLi0.5-x solid solution

Electrochemical hydrogenation of the R2Zn17-xMnx phases (R = Y, La, Gd, Tb)

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