Significant improvement of electrochemical hydrogenation, corrosion protection and thermal stability of LaNi4·6Zn0.4-Li  (x ≤ 0.2) solid solution phases due to Li-doping

Rozdzynska-Kielbik, Beata; Stetskiv, Iryna; Pavlyuk, Volodymyr; Stetskiv, Andrij

doi:10.1016/j.solidstatesciences.2021.106552

Cited by 6 publications

(5 citation statements)

References 18 publications

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“…Different value of discharge capacity is easily explained by corrosion activity of alloys. Similar behavior was manifested in cases hydrogenation of solid solutions with MgCu 2 and CaCu 5 -type structure [17][18][19]. Corrosion-resistant doping components in the electrode composition reduce the destruction of the material.…”

Section: Resultssupporting

confidence: 53%

Crystal structure and electrochemical hydrogenation of HoNiIn1-xAlx (x = 0-1) solid solution

Nychyporuk,

Kordan,

Horiacha

et al. 2023

Phys. Chem. Solid St.

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The influence of the substitution of indium by aluminum in HoNiIn compound at 873 K was investigated in the full concentration range by means of powder X-ray diffraction and EDX analysis. The formation of continuous solid solution was determined and changes of the unit cell parameters were calculated: HoNiIn1.0–0Al0–1.0 (ZrNiAl-type structure, space group P-62m, a = 0.74343(4)–0.69959(6) nm and c = 0.37472(3)–0.38289(4) nm, V = 0.17936(2)–0.16229(3) mn3). The best discharge capacity after electrochemical hydrogenation studies of HoNiIn1-xAlx solid solution is observed for battery prototypes with HoNiIn0.2Al0.8- and HoNiIn0.4Al0.6-based electrodes.

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Section: Resultssupporting

confidence: 53%

Crystal structure and electrochemical hydrogenation of HoNiIn1-xAlx (x = 0-1) solid solution

Nychyporuk,

Kordan,

Horiacha

et al. 2023

Phys. Chem. Solid St.

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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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“…The height of the oxidation peak reflects the kinetic properties of the electrode. The higher the anode peak on the voltammetric curve, the greater the electrocatalytic activity of the electrodes [44]. The cathode peak of the reduction of water to hydrogen often expands, which is associated with the evolution of hydrogen on the surface of the hydride electrodes and may not be visible.…”

Section: Research Resultsmentioning

confidence: 99%

The Effect of C45 Carbon Black-Phosphomolybdic Acid Nanocomposite on Hydrogenation and Corrosion Resistance of La2Ni9Co Hydrogen Storage Alloy

2023

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In this paper, we analysed the influence of corrosion processes and the addition of a carbon black-heteropoly phosphomolybdic acid (C45-MPA) nanocomposite on the operating parameters of a hydride electrode obtained on the basis of the intermetallic compound La2Ni9Co. The electrochemical properties of negative electrodes for NiMH batteries were studied using galvanostatic charge/discharge curves, the potentiostatic method, and electrochemical impedance spectroscopy (EIS). The morphology and chemical composition analysis of the studied electrodes were investigated by means of scanning electron microscopy (SEM) with supporting energy-dispersive X-ray analysis (EDS). For more structural information, FTIR analysis was performed. The results indicate that the presence of the C45-MPA nanocomposite in the electrode material increased both the discharge capacity of the hydride electrode and the exchange current density of the H2O/H2 system. The heteropoly acid-modified electrode is also more resistant to high discharge current densities due to its catalytic activity.

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Significant improvement of electrochemical hydrogenation, corrosion protection and thermal stability of LaNi4·6Zn0.4-Li (x ≤ 0.2) solid solution phases due to Li-doping

Cited by 6 publications

References 18 publications

Crystal structure and electrochemical hydrogenation of HoNiIn1-xAlx (x = 0-1) solid solution

Crystal structure and electrochemical hydrogenation of HoNiIn1-xAlx (x = 0-1) solid solution

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

The Effect of C45 Carbon Black-Phosphomolybdic Acid Nanocomposite on Hydrogenation and Corrosion Resistance of La2Ni9Co Hydrogen Storage Alloy

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