Abstract
Designing highly active and cost-effective electrocatalysts for ORR (oxygen reduction reaction) and revealing their activity origin are indispensable for energy conversion technologies. Herein, atomically distributed Co over S, N co-doped hierarchical porous carbon matrix (Co/S,N-C) is prepared by a sacrificial template strategy. The Co/S,N-C provides abundant active sites for the ORR due to its mesopore structure and large specific surface area. The S, N co-doping can modify the charges around Co active center. As a result, the Co/S,N-C exhibits prominent electrocatalytic activity with comparable half wave potential to commercial Pt/C (0.84 V vs RHE) in alkaline condition. Furthermore, the Zn-air battery based on the Co/S,N-C shows a high specific power of 147.4 mW cm−2 and superior long-term stability.
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