Boosting the Oxygen Transport Kinetics and Functional Properties of La2NiO4+δ via Partial La-to-Sm Substitution Full article
| Journal |
Journal of Alloys and Compounds
ISSN: 0925-8388 , E-ISSN: 1873-4669 |
||||||
|---|---|---|---|---|---|---|---|
| Output data | Year: 2024, Volume: 980, Article number : 173648, Pages count : 15 DOI: 10.1016/j.jallcom.2024.173648 | ||||||
| Tags | Solid oxide fuel cell; Cathode; Doped La2NiO4; Isotope exchange; Thermal expansion; Electrical conductivity; Polarization resistance | ||||||
| Authors |
|
||||||
| Affiliations |
|
Funding (2)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 075-03-2022-351 (122020100324-3) (FUME-2022-0006) |
| 2 | Ministry of Science and Higher Education of the Russian Federation | FWUR-2024-0033 |
Abstract:
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.
Cite:
Pikalova E.
, Sadykov V.
, Tsvinkinberg V.
, Kolchugin A.
, Zhulanova T.
, Guseva E.
, Eremeev N.
, Sadovskaya E.
, Belyaev V.
, Filonova E.
Boosting the Oxygen Transport Kinetics and Functional Properties of La2NiO4+δ via Partial La-to-Sm Substitution
Journal of Alloys and Compounds. 2024. V.980. 173648 :1-15. DOI: 10.1016/j.jallcom.2024.173648 WOS Scopus РИНЦ AN OpenAlex
Boosting the Oxygen Transport Kinetics and Functional Properties of La2NiO4+δ via Partial La-to-Sm Substitution
Journal of Alloys and Compounds. 2024. V.980. 173648 :1-15. DOI: 10.1016/j.jallcom.2024.173648 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Oct 24, 2023 |
| Accepted: | Jan 22, 2024 |
| Published online: | Jan 24, 2024 |
| Published print: | Apr 15, 2024 |
Identifiers:
| Web of science: | WOS:001173883400001 |
| Scopus: | 2-s2.0-85183455172 |
| Elibrary: | 66136984 |
| Chemical Abstracts: | 2024:218662 |
| OpenAlex: | W4391188564 |