Pyrolysis‐Mediated Polycyano Strategy for Directed Construction of Fe 3 C‐Synergized Fe─N Carbon Nanotubes Heterostructure Toward High‐Efficiency Oxygen Reduction Reaction

C nanoparticles lowers the energy barrier of the ORR rate-determining step by facilitating interfacial electron transfer, as evidenced by density functional theory calculations. This work provides a rational strategy for designing high-performance dual-active sites in metal-nitrogen-carbon electrocatalysts and highlights the critical role of atomic-nanoparticle interactions in advanced energy conversion systems.