Hierarchical porous N-P-coupled carbons as metal-free bifunctional electro-catalysts for oxygen conversion

Hierarchical porous N and P co-doped carbons were facilely synthesized by employing phenoxycycloposphazenes (PCPZs) as multi-source of nitrogen, phosphorus and carbon. The pyrolysis of PCPZs that supported on monodispersed silica spheres produced high-surface graphitized carbons (N,P-GCs) with abundant surface N-P coupling sites. The N,P-GCs were demonstrated as efficient metal-free electro-catalysts for both oxygen reduction reaction (ORR) and...