Heterostructured Catalytic Materials as Advanced Electrocatalysts: Classification, Synthesis, Characterization, and Application

Abstract The proactive exploration of electrocatalytic conversion for renewable energy valorization is of tremendous significance in addressing the issues of fossil energy exhaustion, among which the critical challenge of electrocatalysis lies in the rational design of efficient electrocatalysts that are rich in the earth. Among electrocatalysts, the design of heterostructured materials exhibits immense potential for the optimization of noble metals and elaboration of non‐precious metal electrocatalysts with durability. In this review, a systematic overview of modern advances in heterostructured electrocatalysts for a range of energy conversion reactions is described, and special interfacial design brings additional functional effects. Subsequently, various synthesis methods and characterization techniques for heterostructured electrocatalysts are also summarized. The innovative classification of heterostructures in methods of interfacial junction, crystal structure, structural morphology, and properties of the components is presented in this review. Finally, the possible challenges and outlooks of heterostructured electrocatalysts in the future are further discussed, including how to develop more sophisticated synthesis, characterization, and theoretical calculation methods, which will serve as the guiding direction for a more rational interface design. This review aims to set the trajectory for providing meaningful inspiration and references in energy conversion by heterostructured electrocatalysts, advancing the process of carbon neutrality.