Abstract
Powder of proton-conducting BaCe0.5Zr0.3Y0.1Yb0.1O3−δ (BCZYYbO) electrolyte is synthesized using the citrate–nitrate technique. The dispersity of the BCZYYbO suspension in a mixed medium (isopropanol/acetylacetone 70/30 vol %) is investigated. The effects of ultrasonic treatment and centrifuging on the size distribution of aggregates and the effective hydrodynamic diameter are determined. The suspension is characterized by a bimodal size distribution of aggregates. The zeta potential values are determined for the initial BCZYYbO suspension (+7 mV), a suspension with the addition of molecular iodine (0.4 g/L) (+7 mV), and suspensions of the modified initial powder (1 wt % of copper oxide BCZYYbO_CuO) (+11 mV) of the same concentration (15 g/L). It is found that adding iodine does not affect the value of the zeta potential; however it does affects the pH of the suspension. In contrast to the modified suspensions, it is impossible to conduct EPD from the initial BCZYYbO suspension. A refinement is proposed to transform the EPD mechanism from a nonaqueous suspension with the participation of iodine and the trace water content associated with the change in the concentration of H+ and I– ions adsorbed on the particles in the BCZYYbO suspension.
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ACKNOWLEDGMENTS
The authors thank Prof. A.P. Safronov for his help with our DLS measurements.
The study was carried out on the equipment of the Shared Access Center of the IEP UB RAS.
Funding
This work was supported by the Russian Foundation for Basic Research, project no. 20-03-00151. Investigation of the kinetic properties of the suspensions was performed within the framework of the state assignment of IEP UB RAS (EPD thin-layer coatings, no. АААА-А19-119061090040-7).
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Kalinina, E.G., Pikalova, E.Y. Modifying Suspensions for the Electrophoretic Deposition of BaCe0.5Zr0.3Y0.1Yb0.1O3–δ Solid Electrolyte. Russ. J. Phys. Chem. 95, 1942–1947 (2021). https://doi.org/10.1134/S0036024421090077
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DOI: https://doi.org/10.1134/S0036024421090077