Surface Structure Modulation of La_0.6Sr_0.4CoO₃ Films on SrTiO₃ (001) Substrate under Electrochemical Conditions.

ABSTRACT: The surface structure of the La_0.6Sr_0.4CoO₃ film, a typical model water-splitting catalyst, is examined under vacuum and electrochemical conditions using surface X-ray diffraction. The pristine sample has a two-unit-cell-thick strongly polarized SrCoO₃ layer at the surface, and the surface termination is predominantly a CoO₂ layer with apical oxygen atoms. After electrochemical treatment, the surface was covered with an additional edge-shared CoO₆ double layer. The polarization in the SrCoO₃ region was greatly reduced. These structural changes were accompanied by an increase in the working electrode current, suggesting a strong relationship between surface structure modulation and catalytic activity. Reversible st

SUBMITTER: Fujisawa A 

PROVIDER: S-EPMC12532094 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature