Abstract
Enhancing the oxygen reduction activity of mixed electronic-ionic conducting oxides is crucial for various energy and fuel conversion technologies. One effective approach involves modulating the surface oxygen kinetics on fluorite-type oxides by leveraging the acidity of infiltrated binary oxides. Extending this strategy to complex perovskite-oxide-based electrocatalysts, we investigated the influence of surface infiltration of basic CaO or acidic Al2O3 on the oxygen exchange kinetics of SrTi1-xFexO3-δ (STFx) mixed conductors. Through systematic evaluation of the (de)activation induced by infiltration on STFx as a function of iron concentration x, we confirmed the applicability of the acid-base approach to perovskite oxides. Intriguingly, despite uninfiltrated specimens showing a surface oxygen exchange rate diverging by over an order of magnitude with variations in x, it tended to converge to a specific value following CaO or Al2O3 infiltration. This underscores the benefits of utilizing infiltrated STFx with low iron content, providing improved mechanical, thermal, and chemical stability.
Published Version
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