RT Journal Article
T1 Unraveling the Influence of the Electrolyte on the Polarization Resistance of Nanostructured La0.6Sr0.4Co0.2Fe0.8O3-δ Cathodes
A1 Zamudio-García, Javier
A1 Caizán-Juanarena, Leire
A1 Porras-Vázquez, José Manuel
A1 Ramírez-Losilla, Enrique
A1 Marrero-López, David
K1 Electrólitos
AB Large variations in the polarization resistance of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathodes are reported in the literature, which are usually related to different preparation methods, sintering temperatures, and resulting microstructures. However, the influence of the electrolyte on the electrochemical activity and the rate-limiting steps of LSCF remains unclear. In this work, LSCF nanostructured electrodes with identical microstructure are prepared by spray-pyrolysis deposition onto different electrolytes: Zr0.84Y0.16O1.92 (YSZ), Ce0.9Gd0.1O1.95 (CGO), La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM), and Bi1.5Y0.5O3-δ (BYO). The ionic conductivity of the electrolyte has a great influence on the electrochemical performance of LSCF due to the improved oxide ion transport at the electrode/electrolyte interface, as well as the extended ionic conduction paths for the electrochemical reactions on the electrode surface. In this way, the polarization resistance of LSCF decreases as the ionic conductivity of the electrolyte increases in the following order: YSZ > LSGM > CGO > BYO, with values ranging from 0.21 Ω cm2 for YSZ to 0.058 Ω cm2 for BYO at 700 °C. In addition, we demonstrate by distribution of relaxation times and equivalent circuit models that the same rate-limiting steps for the ORR occur regardless of the electrolyte. Furthermore, the influence of the current collector material on the electrochemical performance of LSCF electrodes is also analyzed
PB IOAP-MPDI
YR 2022
FD 2022-11-08
LK https://hdl.handle.net/10630/25883
UL https://hdl.handle.net/10630/25883
LA eng
NO Zamudio-García, J.; Caizán-Juanarena, L.; Porras-Vázquez, J.M.; Losilla, E.R.; Marrero-López, D. Unraveling the Influence of the Electrolyte on the Polarization Resistance of Nanostructured La0.6Sr0.4Co0.2Fe0.8O3-δ Cathodes. Nanomaterials 2022, 12, 3936. https://doi.org/10.3390/nano12223936
NO This work was funded by PID2021-126009OB-I00 and PID2019-110249RB-I00 (Ministerio de Ciencia, Innovación y Universidades) and UMA18-FEDERJA-033 (Junta de Andalucia, Spain/FEDER). J.Z.G. thanks the Ministerio de Ciencia, Innovación y Universidades for his FPU grant (FPU17/02621). L.C.J. would like to thank Plan Andaluz de Investigación, Desarrollo e Innovación (PAIDI 2020) for the research support (DOC 01168).
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 21 ene 2026