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 (E_1/2) of 0.851 ​V versus the reversible hydrogen electrode (vs. RHE) and a limited-diffusion current density (J_L) 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 E_1/2 and J_L 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.

FeCo/MCS-NPCS的FeCo基非贵金属电催化剂（NNMEs）是通过将氯化血红素固定在介孔碳壳修饰的N掺杂多孔碳球（MCS-NPCS）上制备的。获得的 FeCo/MCS-NPCS 表现出0.851 V的半波电位 (E _1/2 ) 相对于可逆氢电极 (vs. RHE) 和5.45 mA cm的有限扩散电流密度 (J _L ) ^－2．此外，就 E _1/2和 J _L而言，FeCo/MCS-NPCS 显示出与 20 wt% Pt/C 相当的氧还原反应 (ORR) 性能以及更好的电化学性能，包括在碱性溶液中的甲醇耐受性和耐久性。FeCo/MCS-NPCS 如此出色的电化学活性可归因于 Fe 和/或 Co 基氮化物和碳化物以及用介孔碳壳改性的 N 掺杂碳基体。该研究为设计和合成面向 ORR 的高效 FeCo-N-C 电催化剂开辟了一条有前途的途径。