Modulating Activity of Lattice Oxygen of ABO 3 Perovskite Oxides in Redox Reactions: A Review

Perovskites, owing to their unique structure, tunable chemical composition, and versatile physicochemical properties, have garnered extensive applications, particularly in redox reactions where the lattice oxygen and/or oxygen vacancies within perovskite are identified as active sites. The modulation of lattice oxygen activity in perovskites is crucial for enhancing the performance of perovskite-type oxides in redox reactions. This review delineates the key factors affecting lattice oxygen activity, including lattice distortions, crystal defects, surface and interface effects, and the migration rate of oxygen ions, and elucidates how these factors synergistically influence the activity of lattice oxygen. A range of strategic approaches, including ionic doping, surface modification, and metal exsolution, are proposed to effectively regulate the behavior and catalytic properties of lattice oxygen. In this investigation, we consolidate a series of analytical and testing methodologies, such as XRD, XPS, ECR, EIS, and TGA, among others, with a focus on lattice oxygen activity, to reveal the fundamental relationship between lattice oxygen activity and the structural and functional attributes of perovskite oxygen carriers. This comprehensive review offers profound insights and guidance for the strategic design and performance optimization of perovskite catalysts or oxygen carriers.