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This work reports the synthesis, the physicochemical characterization and theelectrochemical studies of new electrocatalysts (ECs) for the oxygen reductionreaction (ORR) that: (i) are based on a hierarchical graphene-based support;and (ii) do not comprise platinum. The active sites of the ECs consist of Feand Sn species stabilized in 'coordination nests' of a carbon nitride (CN)matrix. The latter exhibits a rough, microporous morphology and acts as a'shell' covering a graphene 'core'. This paper: (i) discusses the role playedby Fe as the 'active metal' in this family of ECs; and (ii) examines in detailhow the physicochemical properties and, correspondingly, the electrochemicalperformance are affected by a suitable activation procedure A meant to boostthe ORR kinetics. The results lead to an improved fundamental understanding onthe features of the active sites, including the impact of both A and the pH ofthe environment in their performance and ORR mechanism. These insights clarifythe most desirable features to be included in high-performing ECs belonging tothis family, paving the way to the synthesis of next-generation, efficient ECsfor the ORR that do not comprise platinum.

Oxygen reduction reaction electrocatalysts based on FeSn0.5 species embedded in hierarchical CN-graphene based supports