RT Journal Article
T1 Tailoring the thermal expansion and electrochemical properties of Pr0.5Ba0.5FeO3-δ electrodes through high-valence cation doping for SOFCs
A1 Sánchez Caballero, Abraham
A1 Dos-Santos-Gómez, Lucía
A1 Zamudio-García, Javier
A1 Porras-Vázquez, José Manuel
A1 Marrero-López, David
K1 Pilas de combustible
K1 Conversión directa de la energía
AB This study explores how high-valence dopants affect the structural, thermal, and electrochemical properties of (Pr0.5Ba0.5)0.98Fe0.9M0.1O3-δ (M = Ga3+, Ti4+, Zr4+, Nb5+, Mo6+, W6+, and Re7+) for SOFC air electrodes. Thermogravimetric analysis reveals that increasing the dopant oxidation state reduces oxygen loss upon heating, indicating improved stability of the oxygen sublattice. Consistently, dilatometric measurements show a decrease in the thermal expansion coefficients from 22.3 × 10-6 K-1 for Ga3+-doped to 15.1 × 10-6 K-1 for W6+-doped samples. Impedance spectroscopy further confirms a clear correlation between dopant oxidation state and electrode polarization resistance, with values slightly increasing from 0.14 Ω cm2 for (Ga3+) to 0.21 Ω cm2 (W6+) at 700 ºC. These findings demonstrate that while high-valence doping improves structural stability and reduces thermal expansion, it does not necessarily enhance the oxygen reduction reaction activity. Overall, this study provides key insights into doping strategies to optimize SOFC air electrodes by balancing stability, thermalcompatibility, and performance.
PB Elsevier
YR 2025
FD 2025-07-09
LK https://hdl.handle.net/10630/39443
UL https://hdl.handle.net/10630/39443
LA eng
NO Journal of the European Ceramic Society 45 (2025) 117657
NO https://openpolicyfinder.jisc.ac.uk/id/publication/13247
NO PID2021-126009OB-I00TED2021-129836B-I00
NO Ministerio de Ciencia, Innovación e Universidades
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026