Correlation between oxygen evolution reaction activity and surface compositional evolution in epitaxial La<sub>0.5</sub>Sr<sub>0.5</sub>Ni<sub>1−<i>x</i></sub>Fe<sub><i>x</i></sub>O<sub>3−<i>δ</i></sub>thin films
Prajwal Adiga, Le Wang, Cindy Wong, Bethany E. Matthews, Mark Bowden, Steven R. Spurgeon, George E. Sterbinsky, Monika Blum, Min‐Ju Choi, Jinhui Tao, Tiffany C. Kaspar, Scott A. Chambers, Kelsey A. Stoerzinger, Yingge Du
Abstract
= 0-0.5) epitaxial films grown by oxide molecular beam epitaxy as a model Sr-containing perovskite oxide. Electrochemical testing and surface-sensitive spectroscopic analyses show Ni segregation, which is affected by electrochemical history, along with surface amorphization, coupled with changes in OER activity. Our findings highlight the importance of surface composition and electrochemical cycling conditions in understanding OER performance, suggesting common motifs of the active surface with high surface area systems.
Topics & Concepts
Oxygen evolutionEpitaxyOxideOxygenPerovskite (structure)Materials scienceCatalysisCrystallographyChemical physicsPhysical chemistryChemistryNanotechnologyMetallurgyOrganic chemistryLayer (electronics)ElectrodeElectrochemistryElectrocatalysts for Energy ConversionAdvancements in Solid Oxide Fuel CellsElectronic and Structural Properties of Oxides