Synthesis and electrochemical hydrogenation of RxTb2-xNi17 and Tb2Ni17-yMy phases (R = Y, Zr, La; M = Li, Mg)

V. Kordan; V. Nytka; I. Tarasiuk; K. Kluziak; V. Pavlyuk

doi:10.15330/pcss.25.2.325-332

Authors

V. Kordan Ivan Franko National University of Lviv, Lviv, Ukraine
V. Nytka Ivan Franko National University of Lviv, Lviv, Ukraine
I. Tarasiuk Ivan Franko National University of Lviv, Lviv, Ukraine
K. Kluziak Jan Długosz University of Czestochowa, Czestochowa, Poland
V. Pavlyuk Ivan Franko National University of Lviv, Lviv, Ukraine; Jan Długosz University of Czestochowa, Czestochowa, Poland

DOI:

https://doi.org/10.15330/pcss.25.2.325-332

Keywords:

powder X-ray diffraction, scanning electron microscopy, Th2Ni17-type structure, electrochemical properties, Ni-MH battery

Abstract

Alloys from the regions of existence of the solid solutions R_xTb_2-xNi₁₇ and Tb₂Ni_17-yM_y were synthesized by arc-melting with further annealing at 400 ºС. 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/R/Ni and Tb/Ni/Mg ratio in the samples was confirmed also by X-ray fluorescence spectroscopy. The cell parameters of R_xTb_2-xNi₁₇ (x = 0.5) ternary phases are: a = 8.2987(9) Å, c = 8.0206(8) Å, V = 478.37(9) Å³ for R = Zr, a = 8.3161(6) Å, c = 8.0482(8) Å, V = 482.03(6) Å³ for R = Y and a = 8.3690(6) Å, c = 8.0560(7) Å, V = 488.66(6) Å³ for R = La. Tb atoms were partially substituted by Y, Zr and La atoms because of closeness of atomic radii size. Under experimental condition capacity parameters were 1.81 H/f.u. for the Zr-containing electrode, 2.29 H/f.u. for the Y-containing electrode and 2.31 H/f.u. for the La-containing electrode. In the case of Li,Mg co-doped electrodes we observed more than 2.5 H/f.u. Cell parameters of the Zr- and La-containing phases after hydrogenation increased isotropically. Synthesized hydrides can be interpreted as superstructures with the Tb₂Mn₁₇C_2.5-type (filled-up of Th₂Ni₁₇). The Y_0.5Tb_1.5Ni₁₇-based electrode demonstrates the potential corrosion at -0.540 V, electrodes with the compositions Zr_0.5Tb_1.5Ni₁₇ and La_0.5Tb_1.5Ni₁₇ show -0.413 V and -0.405 V, respectively. Li and Mg-codoped electrodes shoved the corrosion potential -0.410 V (Tb₂Ni_16.4Li_0.2Mg_0.4) and -0.550 V for Tb₂Ni_15.6Li_0.6Mg_0.8, respectively.

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