RT Journal Article
T1 Stability and performance of La0.6Sr0.4Co0.2Fe0.8O3 nanostructured cathodes with Ce0.8Gd0.2O1.9 surface coating
A1 Dos Santos-Gómez, Lucía
A1 Porras-Vázquez, José Manuel
A1 Ramírez-Losilla, Enrique
A1 Martín-Jiménez, Francisco de Paula
A1 Ramos-Barrado, José Ramón
A1 Marrero-López, David
K1 Cátodos
AB La0.6Sr0.4Co0.2Fe0.8O3-δ is considered as one of the most promising cathodes for Solid Oxide Fuels Cells (SOFCs) operating at intermediate temperatures, however, its performance degrades significantly over time mainly due to phase segregations on the surface. In this work, the surface of La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.8Gd0.2O1.9 (LSCF-CGO) nanostructured cathode is coated with CGO particles via a simple and economic spray-pyrolysis deposition process. The electrode polarization resistance (Rp) and the microstructure evolution of the uncoated and CGO-coated cathodes are investigated by impedance spectroscopy and scanning electron microscopy, respectively. The CGO-coated cathodes exhibit improved stability and performance, with Rp values varying from 0.27 to 0.30 Ωcm2 at an annealing temperature of 600 °C for 400 h. On the contrary, the uncoated cathode shows a faster degradation rate, with a continuous increase of Rp from 2.8 to 8.5 Ωcm2. Above 800 °C, the particle coarsening of the CGO layer results in a significant increase of Rp over time, reaching steady values of 0.04 Ωm2 at 800 °C. An anode-supported cell with the CGO-coated cathode shows a remarkable power density of 0.72 Wcm−2 at 650 °C in comparison to 0.56 Wcm−2 for the cell with uncoated cathode.
PB Elsevier
YR 2017
FD 2017
LK https://hdl.handle.net/10630/36963
UL https://hdl.handle.net/10630/36963
LA eng
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 19 ene 2026