TY - JOUR

T1 - Preparation, electrical and thermal properties of new anode material based on Ca-doped perovskite CeAlO3

AU - Korona, Daniil V.

AU - Smelov, Alexey O.

AU - Gilev, Artem R.

AU - Animitsa, Irina E.

AU - Pryakhina, Victoria I.

N1 - Текст о финансировании #1 This work was supported in parts by the Ministry of Science and Higher Education of the Russian Federation (state task project registration FEUZ-2023-0016 ). The equipment of the Ural Center for Shared Use “Modern nanotechnology” Ural Federal University (Reg.№ 2968 ) was used with the financial support of the Ministry of Science and Higher Education of the Russian Federation (Project № 075-15-2021-677 ). Текст о финансировании #2 This work was supported in parts by the Ministry of Science and Higher Education of the Russian Federation (state task project registration FEUZ-2023-0016). The equipment of the Ural Center for Shared Use “Modern nanotechnology” Ural Federal University (Reg.№ 2968) was used with the financial support of the Ministry of Science and Higher Education of the Russian Federation (Project № 075-15-2021-677).

PY - 2023

Y1 - 2023

N2 - Tetragonal perovskite phase Ce0.9Ca0.1AlO2.95 + x was obtained for the first time. Such phase, containing cerium in the oxidation state of 3+, can be promising anode materials for a solid oxide fuel cells (SOFCs). Ce0.9Ca0.1AlO2.95 + х (space group I4/mcm) was synthesized by the solid-phase method at 1400°С in a nitrogen flow with using ammonium oxalate (NH4)2C2O4 to create a reducing atmosphere. Thermogravimetry results showed that Ce0.9Ca0.1AlO2.95 + x was stable to oxidation up to 500°С in air and up to 700°С in argon (partial pressure of oxygen рО2 = 10−4 bar). The thermal expansion coefficient measured by dilatometry was equal to 11.16·10−6 К−1. The temperature dependences of the electrical conductivity (for undoped phase CeAlO3 σ ≈ 1·10−3 S/cm and for doped Ce0.9Ca0.1AlO2.95 + x σ ≈ 3·10−2 S/cm at 500°С in air) were obtained by the electrochemical impedance spectroscopy measurements). The electrical conductivity of these samples at the temperatures range of 350–500°С was almost independent of the partial pressure of oxygen рО2 from 10−18 to 0.21 bar, however, there was a slight negative slope at T > 500 °C (рО2). The total ionic transport numbers measured by the EMF method were close to 1·10−3, which indicated the dominance of electronic conductivity. The measurement of the sign of the thermal-EMF showed that positive charge carriers (holes) were dominant charge carriers. © 2023 Hydrogen Energy Publications LLC.

AB - Tetragonal perovskite phase Ce0.9Ca0.1AlO2.95 + x was obtained for the first time. Such phase, containing cerium in the oxidation state of 3+, can be promising anode materials for a solid oxide fuel cells (SOFCs). Ce0.9Ca0.1AlO2.95 + х (space group I4/mcm) was synthesized by the solid-phase method at 1400°С in a nitrogen flow with using ammonium oxalate (NH4)2C2O4 to create a reducing atmosphere. Thermogravimetry results showed that Ce0.9Ca0.1AlO2.95 + x was stable to oxidation up to 500°С in air and up to 700°С in argon (partial pressure of oxygen рО2 = 10−4 bar). The thermal expansion coefficient measured by dilatometry was equal to 11.16·10−6 К−1. The temperature dependences of the electrical conductivity (for undoped phase CeAlO3 σ ≈ 1·10−3 S/cm and for doped Ce0.9Ca0.1AlO2.95 + x σ ≈ 3·10−2 S/cm at 500°С in air) were obtained by the electrochemical impedance spectroscopy measurements). The electrical conductivity of these samples at the temperatures range of 350–500°С was almost independent of the partial pressure of oxygen рО2 from 10−18 to 0.21 bar, however, there was a slight negative slope at T > 500 °C (рО2). The total ionic transport numbers measured by the EMF method were close to 1·10−3, which indicated the dominance of electronic conductivity. The measurement of the sign of the thermal-EMF showed that positive charge carriers (holes) were dominant charge carriers. © 2023 Hydrogen Energy Publications LLC.

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U2 - 10.1016/j.ijhydene.2023.03.431

DO - 10.1016/j.ijhydene.2023.03.431

M3 - Article

VL - 48

SP - 22698

EP - 22711

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

IS - 59

ER -