In Situ Self-Reconstructed Nanoheterostructure Catalysts for Promoting Oxygen Reduction Reaction

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Constructing heterostructures to obtain catalysts with high electrocatalytic activity is an essential but challenging research direction. Herein, a new composite catalyst, modified with nanospinel on the perovskite skeleton, Pr 0.4 Sr 0.6 Co 0.2 Fe 0.8 O 3 - δ -(Co x Fe 1– x ) 3 O 4 (sp-PSFC), is obtained using intelligent in situ compounding. Irreversibly exsolved nanoparticles are uniformly embedded on the surface of Pr 0.4 Sr 0.6 Co 0.2 Fe 0.8 O 3 (PSFC) in the form of a nonshell layer to produce a nanoscale heterojunction. The structure of PSFC is fine-tuned through the exsolution of nanoparticles, resulting in B-site ion vacancies and oxygen vacancies, which promote the adsorption and migration of oxygen species. The construction of a heterointerface effectively reduces the oxygen adsorption energy of the cathode, leading to the formation of multiple reaction paths for the migration of oxygen species. This method of constructing a heterointerface by in situ irreversible exsolution overcomes the deficiency of single-phase reaction kinetics and provides a strategy for optimizing catalyst activity.