RT Journal Article
T1 Reduced thermal expansion and improved electrochemical performance in Pr-substituted SrFeO3 as symmetrical electrode for Solid Oxide Fuel Cells
A1 Sánchez Caballero, Abraham
A1 Zamudio-García, Javier
A1 dos Santos-Gómez, Lucía
A1 da Silva, Iván
A1 Pérez-Coll, Domingo
A1 Porras-Vázquez, José Manuel
A1 Marrero-López, David
K1 Electroquímica
K1 Química atmosférica
K1 Conductividad eléctrica
K1 Electrodos
K1 Oxígeno
K1 Oxidorreducción
K1 Expansión (Calor)
K1 Anoxia
K1 Propiedades eléctricas
AB Advances in doping strategies have significantly improved the properties of SrFeO3-based electrodes. However, challenges such as high thermal expansion coefficients and limited redox stability remain critical issues that require further investigation. This study focuses on the optimization of (Sr1–xPrx)0.95FeO3–δ (0 < x ≤ 1) series, evaluating the effects of praseodymium content on thermal expansion, redox stability, and electrochemical performance for potential application as both air and fuel electrodes in symmetrical solid oxide fuel cells. Rietveld refinements of X-ray and neutron diffraction data reveal a phase transformation from tetragonal to cubic symmetry with Pr content (0.2 ≤ x ≤ 0.4), followed by a transition to orthorhombic symmetry (x ≥ 0.6). Thermogravimetric and dilatometric analyses demonstrate that higher Pr content effectively reduces both oxygen nonstoichiometry and the thermal expansion coefficients, which decrease from 31 × 10–6 K–1 for x = 0.2 to 8.4 × 10–6 K–1 for x = 1. Meanwhile the electrical conductivity remains relatively unaffected by the Pr-content up to x = 0.8, reaching values as high as 116 S cm–1 at 700 °C in air. Additionally, the electrode polarization resistances are relatively low across the series, e.g. 0.11 Ω cm2 in air and 0.09 Ω cm2 in H2 for x = 0.6 at 700 °C, while exhibiting excellent redox cycling stability. These findings indicate that (Sr1–xPrx)0.95FeO3–δ (x ≥ 0.6) materials are promising electrodes, offering tunable thermal expansion and electrochemical properties for reliable performance in both oxidizing and reducing environments.
PB ACS Publications
SN 1944-8244
YR 2025
FD 2025-03-27
LK https://hdl.handle.net/10630/38830
UL https://hdl.handle.net/10630/38830
LA eng
NO Sánchez-Caballero, A., Zamudio-García, J., dos Santos-Gómez, L., da Silva, I., Pérez-Coll, D., Porras-Vázquez, J. M., & Marrero-López, D. (2025). Reduced Thermal Expansion and Improved Electrochemical Performance in Pr-Substituted SrFeO3 as Symmetrical Electrode for Solid Oxide Fuel Cells. ACS Applied Materials & Interfaces, 17(14), 21380–21391.
NO Funding for open access charge: Universidad de Málaga / CBUA
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026