Separating the Effects of Band Bending and Covalency in Hybrid Perovskite Oxide Electrocatalyst Bilayers for Water Electrolysis.

ABSTRACT: The Co-O covalency in perovskite oxide cobaltites such as La_1-xSr_xCoO₃ is believed to impact the electrocatalytic activity during electrochemical water splitting at the anode where the oxygen evolution reaction (OER) takes place. Additionally, space charge layers through band bending at the interface to the electrolyte may affect the electron transfer into the electrode, complicating the analysis and identification of true OER activity descriptors. Here, we separate the influence of covalency and band bending in hybrid epitaxial bilayer structures of highly OER-active La_0.6Sr_0.4CoO₃ and undoped and less-active LaCoO₃. Ultrathin LaCoO₃ capping layers of 2-8 unit cells on La_0.6Sr<

SUBMITTER: Heymann L 

PROVIDER: S-EPMC8972245 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature