Electrocatalysts are composed of transition metal/metal oxide and N-doped carbon can overcome the sluggish kinetics of oxygen reduction reactio. Herein, the Co3O4/ketjen black (KB)@MOF-derived with uniformly dispersed and ultrafine Co3O4 nanoparticles (1-5 nm) are synthesized by a facile in-situ method and subsequent mild pyrolysis process. It exhibits enhanced activity with onset potential of 0.96 V (vs. RHE) and a half-wave potential of 0.86 V (vs. RHE) in 0.1 M KOH solution, the excellent durability with E1/2 a small negative shift of 10 mV after 5000 continuous cycles and good methanol-tolerance property. The ultrahigh catalytic performance of Co3O4/KB@MOF-derived can be ascribed to the small particle size range of 1-5 nm of Co3O4, as well as the strong interaction between the in-situ formed N-Co3O4 active sites and substrate under the mild calcination temperature. Above all, these indicate that the as-prepared Co3O4/KB@MOF-derived may be a good alternative to commercial Pt-based catalysts.

中文翻译：

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源自金属有机骨架的高分散超细 Co3O4@N 掺杂碳催化剂用于高效氧还原反应

电催化剂由过渡金属/金属氧化物和 N 掺杂的碳组成，可以克服氧还原反应的缓慢动力学。在此，Co3O4/ketjen black (KB)@MOF 衍生的具有均匀分散的超细 Co3O4 纳米粒子 (1-5 nm) 是通过简便的原位方法和随后的温和热解过程合成的。它表现出增强的活性，在 0.1 M KOH 溶液中的起始电位为 0.96 V（vs. RHE），半波电位为 0.86 V（vs. RHE），优异的耐久性，E1/2 后有 10 mV 的小负移5000 次连续循环和良好的耐甲醇性能。Co3O4/KB@MOF 衍生的超高催化性能可归因于 Co3O4 的 1-5 nm 小粒径范围，以及在温和的煅烧温度下原位形成的 N-Co3O4 活性位点与底物之间的强相互作用。最重要的是，这些表明所制备的 Co3O4/KB@MOF 衍生的可能是商业 Pt 基催化剂的良好替代品。