Shah, N.Zhu, T.Feng, D.Xu, X.Liang, F.Wang, H.Zhu, Z.Ge, L.2025-01-232025-01-232024Journal of Power Sources, 2024; 616:235143-1-235143-80378-77530378-7753https://hdl.handle.net/2440/143612Solid oxide fuel cells (SOFCs) offer promising prospects for sustainable electricity generation, attributed to high efficiency and fuel adaptability. However, their widespread application relies on three critical factors: performance, cost-effectiveness, and durability. Durability presents a significant hurdle; one key reason is the thermal expansion mismatch between cobalt-based cathodes and electrolytes, potentially leading to detachment at the cathode-electrolyte interface. In this study, we propose an approach to mitigate this challenge by fine-tuning the thermal expansion characteristics of the cathode. By tailoring lattice and chemical expansion, our composite cathode incorporates recognized materials like Ba0⋅5Sr0⋅5Co0⋅8Fe0⋅2O3-δ with Sm0.2Ce0⋅8O1.9 and the negative thermal expansion (NTE) material Y2W3O12. Through the design of composite materials, we achieve enhanced thermal cycling stability with only ~20 % area-specific resistance (ASR) increases after 40 harsh thermal cycles between 300–600 ◦C compared to pure BSCF with over 100 % increment. This optimization process effectively reduces the thermal expansion coefficient while preserving BSCF’s overall properties, offering a promising path for supporting SOFC durability and performance.en© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Solid oxide fuel cells; Durability; Thermal expansion coefficient; Composite cathodeJournal article10.1016/j.jpowsour.2024.235143703395Xu, X. [0000-0002-0149-815X]