2026-06-04T23:55:26Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/467672026-06-01T23:46:23Zcom_10630_2254col_10630_37953

Interfacial active layers for redox-stable symmetrical solid oxide fuel cells Caizán-Juanarena, Leire Zamudio-García, Javier Sánchez-Caballero, Abraham Santos-Gómez, Lucía dos Marrero-López, David Química inorgánica Química del estado sólido Materiales nanoestructurados Materiales nanocompuestos Reacciones químicas Oxidorreducción Pirólisis The incorporation of active layers has become an effective strategy to reduce interfacial polarization losses in solid oxide fuel cells (SOFCs). However, the development of redox-stable active layers capable of operating under both oxidizing and reducing atmospheres in symmetrical cell configurations remains challenging. In this work, we develop a redox-stable Sr0.98Fe0.75Ti0.25O3-δ-Ce0.9Gd0.1O1.95 (SFT-CGO) nanocomposite that maintains its structural and chemical integrity during cycling between air and hydrogen atmospheres. When deposited via spray-pyrolysis as a nanostructured active layer, the composite forms a dense and homogeneous interface with the electrolyte, facilitating charge transfer and oxide-ion transport while increasing the density of electrochemically active surface pathways. This optimized interface significantly reduces the polarization resistance under both anodic and cathodic operation. As a result, a symmetrical electrolyte-supported cell incorporating the active layer delivers a peak power density of 630 mW cm−2 at 800 °C, compared to 380 mW cm−2 for the reference cell without the active layer. These results demonstrate that a redox-stable nanocomposite interlayer offers a scalable approach to improving interfacial properties and overall performance in symmetrical solid oxide cells. 2026 journal article Leire Caizán-Juanarena, Javier Zamudio-García, A. Sánchez-Caballero, Lucía dos Santos-Gómez, David Marrero-López, Interfacial active layers for redox-stable symmetrical solid oxide fuel cells, Ceramics International, Volume 52, Issue 15, Part A, 2026, Pages 27903-27911, ISSN 0272-8842, https://doi.org/10.1016/j.ceramint.2026.04.322 0272-8842 https://hdl.handle.net/10630/46767 10.1016/j.ceramint.2026.04.322 eng http://creativecommons.org/licenses/by/4.0/ open access Attribution 4.0 International Elsevier