Perovskite Oxide–Halide Solid Solutions: A Platform for Electrocatalysts

• Published in: Angewandte Chemie (International ed.) Vol. 60; no. 18; pp. 9953 - 9958
• Main Authors: Wang, Tao, Fan, Juntian, Do‐Thanh, Chi‐Linh, Suo, Xian, Yang, Zhenzhen, Chen, Hao, Yuan, Yating, Lyu, Hailong, Yang, Shize, Dai, Sheng
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 26-04-2021; Wiley
• Edition: International ed. in English
• Subjects: Electrocatalysts; Fluorides; Free energy; Heat of formation; high-entropy materials; Hybridization; INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; mechanochemistry; Oxides; oxygen evolution reaction; Oxygen evolution reactions; perovskite phases; Perovskites; Solid solutions; Synthesis; oxygen evolution reaction; solid solutions; mechanochemistry; high-entropy materials; perovskite phases
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.202101120

The successful integration or hybridization of perovskite oxides with their halide cousins would enable the formation of both multi‐anionic and multi‐cationic solid solutions with unique metal‐ion sites and synergistic properties that could potentially surpass the performance of classic perovskites. However, such solid solutions had not been produced previously owing to their distinct formation energies and different synthesis conditions. Solid solutions combining perovskite oxides with fluorides were produced in this study 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.
Perovskite oxide–halide solid solutions have attractive features, such as highly mixed oxide–fluoride octahedrons with different elements and valences, uniform element distributions, and single‐phase crystalline structures. Perovskite oxide–halide solid solutions prepared by mechanochemical synthesis have great potential to surpass traditional perovskites as electrocatalysts.