Tailoring the oxygen evolution activity and stability using defect chemistry

Citations of this article
Mendeley users who have this article in their library.
Get full text


© 2017 by the authors. Licensee MDPI, Basel, Switzerland. Improving the activity of catalysts for the oxygen evolution reaction (OER) requires a detailed understanding of the surface chemistry and structure to deduce structure-function relationships (descriptors) for fundamental insight. We chose epitaxial (100)-oriented La 0.6 Sr 0.4 Mn 1 −δ O 3 (LSMO) thin films as a model system with high electrochemical activity comparable to (110)-oriented IrO 2 to investigate the effect of Mn off-stoichiometry on both catalytic activity and stability. Extensive structural characterization was performed by microscopic and spectroscopic methods before and after electrochemical characterization using rotating ring-disk studies. Stoichiometric LSMO had the highest activity, while both Mn deficiency and excess reduced the catalytic activity. Furthermore, all samples preserved the crystal structure up to the very surface. Mn excess improved the long-term activity, and we hypothesize that excess Mn stabilizes the surface chemistry during catalysis. Our data show that the defect chemistry should be considered when designing catalysts with enhanced activity and rugged stability.




Scholz, J., Risch, M., Wartner, G., Luderer, C., Roddatis, V., & Jooss, C. (2017). Tailoring the oxygen evolution activity and stability using defect chemistry. Catalysts, 7(5). https://doi.org/10.3390/catal7050139

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free