2026-06-05T04:37:35Zhttps://riuma.uma.es/rest/oai/request

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

00925njm 22002777a 4500 dc Caizán-Juanarena, Leire author Zamudio-García, Javier author Sánchez-Caballero, Abraham author Santos-Gómez, Lucía dos author Marrero-López, David author 2026 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. 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 Química inorgánica Química del estado sólido Materiales nanoestructurados Materiales nanocompuestos Reacciones químicas Oxidorreducción Pirólisis Interfacial active layers for redox-stable symmetrical solid oxide fuel cells