Perovskite Oxide–Halide Solid Solutions: A Platform for Electrocatalysts

Abstract

The successful integration or hybridization of perovskite oxides with their halide cousins can realize both multi‐anionic and multi‐cationic solid solutions with unique metal ion sites and synergistic properties, potentially surpassing the performance of the classic perovskites. However, such solid solutions have not been achieved due to their distinct formation energies and different synthesis conditions. The solid solutions combining perovskite oxides with fluorides were produced here by mechanochemical synthesis. The obtained perovskite oxide‐halide solid solutions had highly mixed elements and valences, uniform element distributions, and single‐phase crystalline structures. The solid solution with an optimized combination of oxides and fluorides exhibited enhanced catalytic performance in the oxygen evolution reaction.