TY - JOUR

T1 - Comprehensive study of functional properties and electrochemical performance of layered lanthanum nickelate substituted with rare-earth elements

AU - Pikalova, Elena

AU - Kolchugin, Alexander

AU - Цвинкинберг, Виктор Андреевич

AU - Sereda, Vladimir

AU - Khrustov, Anton

AU - Filonova, Elena

N1 - The authors are grateful to Ms. Nadezhda Pikalova (Institute of Metallurgy, UB RAS, Yekaterinburg) for the electrode preparation and Ms. Anastasia Ivanova (Ural Federal University, Yekaterinburg) for the help with graphical visualization. The study was done in the framework of the Government task IHTE UB RAS, № 122020100324–3.

PY - 2023

Y1 - 2023

N2 - The present work is devoted to the comparative study of the absolute oxygen content, thermal expansion, electrical conductivity, and electrochemical performance of the La1.6Ln0.4NiO4+δ (Ln = La, Pr, Nd, Sm, Eu) complex oxides. The thermal expansion coefficients, obtained for the La1.6Ln0.4NiO4+δ compact samples, have approved thermomechanical compatibility of the materials with the Sm0.2Ce0.8O1.9 electrolyte. The highest conductivity value is found to be 107 S cm−1 at 420 °C for the La1.6Sm0.4NiO4+δ sample. The results of scanning electron microscopy, performed after the cycle of measurements on two-layer electrodes with the La1.6Ln0.4NiO4+δ functional layers and the LaNi0.6Fe0.4O3−δ (LNF) collector layers, have demonstrated the stability of the electrode structure under the measurement conditions and the maintenance of high average porosity for both layers. The minimum polarization resistance value, equal to 0.64 Ω cm2 at 700 °C, has been measured for the La1.6Eu0.4NiO4+δ electrode sintered at 1200 °C. Comprehensive distribution function of relaxation times (DFRT or DRT) analyses of the impedance data has been performed to establish the rate-limiting stages of the electrode reaction. Oxygen kinetic parameters calculated in the framework of the Adler-Lane-Steele (ALS) model with considering the microstructural parameters are shown to correlate well with those obtained from the isotope exchange data. © 2023 Elsevier B.V.

AB - The present work is devoted to the comparative study of the absolute oxygen content, thermal expansion, electrical conductivity, and electrochemical performance of the La1.6Ln0.4NiO4+δ (Ln = La, Pr, Nd, Sm, Eu) complex oxides. The thermal expansion coefficients, obtained for the La1.6Ln0.4NiO4+δ compact samples, have approved thermomechanical compatibility of the materials with the Sm0.2Ce0.8O1.9 electrolyte. The highest conductivity value is found to be 107 S cm−1 at 420 °C for the La1.6Sm0.4NiO4+δ sample. The results of scanning electron microscopy, performed after the cycle of measurements on two-layer electrodes with the La1.6Ln0.4NiO4+δ functional layers and the LaNi0.6Fe0.4O3−δ (LNF) collector layers, have demonstrated the stability of the electrode structure under the measurement conditions and the maintenance of high average porosity for both layers. The minimum polarization resistance value, equal to 0.64 Ω cm2 at 700 °C, has been measured for the La1.6Eu0.4NiO4+δ electrode sintered at 1200 °C. Comprehensive distribution function of relaxation times (DFRT or DRT) analyses of the impedance data has been performed to establish the rate-limiting stages of the electrode reaction. Oxygen kinetic parameters calculated in the framework of the Adler-Lane-Steele (ALS) model with considering the microstructural parameters are shown to correlate well with those obtained from the isotope exchange data. © 2023 Elsevier B.V.

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U2 - 10.1016/j.jpowsour.2023.233505

DO - 10.1016/j.jpowsour.2023.233505

M3 - Article

VL - 581

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

M1 - 233505

ER -