TY - JOUR

T1 - Boosting the oxygen transport kinetics and functional properties of La2NiO4+δ via partial La-to-Sm substitution

AU - Pikalova, E.

AU - Sadykov, V.

AU - Tsvinkinberg, V.

AU - Kolchugin, A.

AU - Zhulanova, T.

AU - Guseva, E.

AU - Eremeev, N.

AU - Sadovskaya, E.

AU - Belyaev, V.

AU - Filonova, E.

N1 - Material synthesis, sample preparation, electrical and thermomechanical characterization, as well as electrochemical studies were performed in the framework of the budget task for the Institute of High Temperature Electrochemisty, UB RAS, project № 122020100324–3 . The standard characterization of powder and ceramic materials was carried out at the Shared Access Centre “Composition of Compounds” of the Institute of High Temperature Electrochemistry, UB RAS. TGA and oxygen mobility studies were supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental order for Boreskov Institute of Catalysis, SB RAS.

PY - 2024/4/1

Y1 - 2024/4/1

N2 - Layered nickelates, as representatives of Ruddlesden-Popper phases, are widely used in electrochemical, catalytic and other applications due to their advanced transport and thermomechanical characteristics. In this work, La2–xSmxNiO4+δ (x = 0.0 – 1.0) complex oxides are obtained and then comprehensively studied as potential oxygen electrode materials for solid oxide fuel and electrolysis cells (SOFCs and SOECs). These materials are synthesized by a glycerol-nitrate combustion method. The obtained compounds are single-phase up to x = 0.8 and possess a tetragonal Ruddlesden-Popper structure (I4/mmm sp. gr.). A combination of complementary techniques, including reverse dichromatometric titration, thermogravimetric and isotope exchange methods has been used to demonstrate that partial Sm substitution results in an increase in the over-stoichiometric oxygen content in the materials and oxygen transport kinetics. These materials are found to be mixed ionic-electronic conductors with predominantly p-type electronic conductivity exceeding 110 S/cm at 450 °C in air. The Sm-containing nickelates exhibit improved thermomechanical compatibility and show no chemical interaction with CeO2-based solid electrolytes compared to the undoped La2NiO4+δ. The electrochemical activity of bilayer electrodes consisting of the La2–xSmxNiO4+δ functional layers and LaNi0.6Fe0.4O3–δ-based collectors are studied in air at 600 – 850 °C in the Ce0.8Sm0.2O1.9-based symmetrical cells. Electrochemical impedance spectroscopy study and following distribution of relaxation times analysis indicate a positive impact of the increased oxygen mobility in the La2–xSmxNiO4+δ materials on the overall electrode performance. Due to their superior electrode characteristics compared to La2NiO4+δ, La2–xSmxNiO4+δ with a moderate dopant content (x = 0.2 – 0.3) can be recommended for use as oxygen electrodes for both SOFCs and SOECs.

AB - Layered nickelates, as representatives of Ruddlesden-Popper phases, are widely used in electrochemical, catalytic and other applications due to their advanced transport and thermomechanical characteristics. In this work, La2–xSmxNiO4+δ (x = 0.0 – 1.0) complex oxides are obtained and then comprehensively studied as potential oxygen electrode materials for solid oxide fuel and electrolysis cells (SOFCs and SOECs). These materials are synthesized by a glycerol-nitrate combustion method. The obtained compounds are single-phase up to x = 0.8 and possess a tetragonal Ruddlesden-Popper structure (I4/mmm sp. gr.). A combination of complementary techniques, including reverse dichromatometric titration, thermogravimetric and isotope exchange methods has been used to demonstrate that partial Sm substitution results in an increase in the over-stoichiometric oxygen content in the materials and oxygen transport kinetics. These materials are found to be mixed ionic-electronic conductors with predominantly p-type electronic conductivity exceeding 110 S/cm at 450 °C in air. The Sm-containing nickelates exhibit improved thermomechanical compatibility and show no chemical interaction with CeO2-based solid electrolytes compared to the undoped La2NiO4+δ. The electrochemical activity of bilayer electrodes consisting of the La2–xSmxNiO4+δ functional layers and LaNi0.6Fe0.4O3–δ-based collectors are studied in air at 600 – 850 °C in the Ce0.8Sm0.2O1.9-based symmetrical cells. Electrochemical impedance spectroscopy study and following distribution of relaxation times analysis indicate a positive impact of the increased oxygen mobility in the La2–xSmxNiO4+δ materials on the overall electrode performance. Due to their superior electrode characteristics compared to La2NiO4+δ, La2–xSmxNiO4+δ with a moderate dopant content (x = 0.2 – 0.3) can be recommended for use as oxygen electrodes for both SOFCs and SOECs.

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UR - https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=tsmetrics&SrcApp=tsm_test&DestApp=WOS_CPL&DestLinkType=FullRecord&KeyUT=001173883400001

U2 - 10.1016/j.jallcom.2024.173648

DO - 10.1016/j.jallcom.2024.173648

M3 - Article

VL - 980

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

M1 - 173648

ER -