FeCo-based mesoporous carbon shells modified N-doped porous carbon spheres for oxygen reduction reaction

FeCo-based non-noble metal electrocatalysts (NNMEs) of FeCo/MCS-NPCS was fabricated by immobilization of hemin on mesoporous carbon shells modified N-doped porous carbon spheres (MCS-NPCS). The obtained FeCo/ MCS-NPCS exhibits a half-wave potential (E1/2) of 0.851 V versus the reversible hydrogen electrode (vs. RHE) and a limited-diffusion current density (JL) of 5.45 mA cm-2. In addition, FeCo/MCS-NPCS shows comparable oxygen reduction reaction (ORR) performances to 20 wt% Pt/C in terms of E1/2 and JL and better electrochemical properties, including the methanol tolerance and durability in alkaline solution. Such outstanding electrochemical activities of FeCo/MCS-NPCS can be ascribed to Fe and/or Co-based nitrides and carbides as well as N-doped carbon matrixes modified with mesoporous carbon shells. This research introduces a promising path to design and synthesize highly efficient FeCo-N-C electrocatalysts towards ORR.

Automated summary

FeCo/MCS-NPCS demonstrates superior oxygen reduction reaction performance, attributed to Fe and/or Co-based nitrides and carbides, as well as N-doped carbon matrixes modified with mesoporous carbon shells.