Design and optimization of self-assembled nanocomposite electrodes for SOFCs.

Abstract

Nanocomposites exhibit improved electrochemical and mechanical properties compared to single-phase mate- rials, making them promising for the development of efficient and durable electrodes in solid oxide fuel cells (SOFCs). However, conventional fabrication methods usually involve multiple steps and high sintering tem- peratures, potentially leading to adverse effects on the properties of these materials due to excessive grain growth or reactivity among the cell components. In this study, nanocomposite electrodes of Sm0.5Sr0.5CoO3-δ - Ce0.9Sm0.1O1.95 (SSC–CSO) are prepared using a co-synthesis freeze-drying method, followed by screen-printing deposition and sintering at high temperatures. Alternatively, they are prepared through direct spray-pyrolysis deposition on the electrolyte at reduced temperatures. In both cases, the intimate mixture of SSC and CSO phases not only partially suppresses grain growth but also provides extended actives sites for the electrochemical