Functional thin films as cathode/electrolyte interlayers
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Journal of Materials Chemistry A
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Electrochemical devices such as solid oxide fuel cells (SOFC) may greatly benefit from the implementation of nanoengineered thin-film multifunctional layers providing, alongside enhanced electrochemical activity, improved mechanical and long-term stability. In this study, an ultrathin (400 nm) bilayer of samarium-doped ceria and a self-assembled nanocomposite made of Sm0.2Ce0.8O1.9-La0.8Sr0.2MnO3-δ was fabricated by pulsed laser deposition and is employed as a functional oxygen electrode in an anode-supported solid oxide fuel cell. Introducing the functional bilayer in the cell's architecture results in a simple processing technique for the fabrication of high-performance fuel cells (power density 1.0 W cm−2 at 0.7 V and 750 °C). Durability tests were carried out for up to 1500 h, showing a small degradation under extreme operating conditions of 1 A cm−2, while a stable behaviour at 0.5 A cm−2 (2.8% Vin kh−1). Post-test analyses, including scanning and transmission electron microscopy and electrochemical impedance spectroscopy, demonstrate that the nanoengineered thin film layers remain mostly morphologically stable after the operation.
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MACHADO, MARINA; BAIUTTI, FEDERICO; BERNADET, LUCILE; MORATA, ALEX; NUNEZ, MARC; OUWELTJES, JAN P.; FONSECA, FABIO C.; TORRELL, MARC.; TARANCON, ALBERT. Functional thin films as cathode/electrolyte interlayers: a strategy to enhance the performance and durability of solid oxide fuel cells. Journal of Materials Chemistry A, v. 10, n. 33, p. 17317-17325, 2022. DOI: 10.1039/d2ta03641j. Disponível em: http://repositorio.ipen.br/handle/123456789/33656. Acesso em: 27 Mar 2026.
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