Abstract
Composite powders (66 wt % NiO + 34 wt % Zr0.84Y0.16O1.92 were obtained according to the solution combustion synthesis technique by crystallization of nickel oxide particles on the surface of Zr0.84Y0.16O1.92particles. The samples pressed from powders after sintering and reduction in moist hydrogen had high electrical conductivity, more than 16 × 103 S cm–1 at room temperature. Impedance spectroscopic studies have shown that in a humid atmosphere of Ni – Zr0.84Y0.16O1.92, electrodes formed on the surface of a dense Zr0.84Y0.16O1.92 electrolyte have low electrochemical activity. The impregnation of the electrodes with a solution of cerium nitrate followed by thermolysis made it possible to increase the electrochemical activity of the electrode by two to three orders of magnitude. An analysis of the electrochemical impedance spectra through the calculation of the distribution function of the relaxation time showed that the rate of hydrogen oxidation at the electrodes is limited by surface–adsorption processes. After impregnation, the gas diffusion resistance significantly limits the electrode reaction rate.
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The authors are grateful to A.S. Farlenkov for carrying out microscopic studies. This work was partly carried out using facilities of the shared access center “Composition of Compounds”, IHTE, UB RAS.
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The work was financially supported by the Government of the Russian Federation, agreement no. 02.A03.21.0006 (Act 211). The synthesis of composite powders was carried out in accordance with the state assignment of the Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences (topic no. AAAA-A19-119031890026-6).
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The authors declare that they have no conflict of interest.
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Osinkin, D.A., Zhuravlev, V.D. Nickel–Ceramic Electrodes with High Nickel Content for Solid Electrolyte Electrochemical Devices. Russ J Appl Chem 93, 299–304 (2020). https://doi.org/10.1134/S1070427220020202
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DOI: https://doi.org/10.1134/S1070427220020202