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Recently, carbon nanomaterials doped with nonmetallic atoms have been used as electrocatalysts involved in oxygen reduction reactions (ORRs) because of the lack of degradation and contamination problems caused by metal dissolution, low cost, sustainability, and multifunctionality. In this study, the metal-free N-, P-, O-tridoped carbon hollow nanospheres (N, P, O-Carbon) with openings in the shell surfaces have been developed, where poly(o-phenylenediamine) hollow nanospheres with openings in the shell surfaces were chosen as a nitrogen-r