Résumé
Developing highly active non-precious metal catalysts for the oxygen reduction reaction (ORR) is of great significance to reduce the cost of fuel cells. Three-dimensional ordered porous structures could substantially improve the performance of the catalysts because of its excellent mass diffusion properties and high speci fic surface area. Herein, we prepared ordered porous ZIF-67 by forced molding of a polystyrene template and obtained cobaltsupported, nitrogen-doped three-dimensional ordered porous carbon (Co-NOPC) after further carbonation. The resultant Co-NOPC exhibits excellent performance for the ORR in an alkaline medium with a half-wave potential (E1/ 2) of 0.86 V vs. RHE, w hich is greater than that of the state-of-the-art Pt/C (0.85V vs. RHE). Moreover, the substantially improved catalytic performance of Co-NOPC compared to cobalt-supported, nitrogen-doped carbon (Co-NC) reveals the key role of its hierarchical porosity for boosting ORR. Co-NOPC also performs a close-to-ideal four-electron transfer path, long-term durability, and methanol penetration resistance, making it promising for large-scale application.