Rotating Ring
By Scholz, Julius; Risch, Marcel; Stoerzinger, Kelsey A.; Wartner, Garlef; Shao-Horn, Yang; Jooss, Christian
Published in The Journal of Physical Chemistry C
2016
Abstract
Transition-metal oxides with the perovskite structure are promising catalysts to promote the kinetics of the oxygen evolution reaction (OER). To improve the activity and stability of these catalysts, a deeper understanding about the active site, the underlying reaction mechanism, and possible side reactions is necessary. We chose smooth epitaxial (100)-oriented La0.6Sr0.4MnO3 (LSMO) films grown on Nb:SrTiO3 (STNO) as a model electrode to investigate OER activity and stability using the rotating ring?disk electrode (RRDE) method. Careful electrochemical characterization of various films in the thickness range between 10 and 200 nm yields an OER activity of the epitaxial LSMO surface of 100 ?A/cm2ox at 1.65 V vs RHE, which is among the highest reported for LSMO and close to (110)-oriented IrO2. Detailed post-mortem analysis using XPS, XRD, and AFM revealed the high structural and morphological stability of LSMO after OER. The observed correlation between activity and Mn vacancies on the surface suggested Mn as the active site for the OER in (100)-oriented LSMO, in contrast to similar perovskite manganites, such as Pr1
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