Co₃O₄ has been considered as one kind of promising catalysts for the oxidation of CO. According to the Mars-van Krevelen mechanism, oxygen vacancies of Co₃O₄ play a significant role in catalytic activity. Herein, we report a novel structure-induced strategy to develop hollow Co₃O₄ with rich oxygen vacancies for efficient oxidation of CO. Through a reduction-oxidation pyrolysis process, the metal-organic frameworks (MOFs) precursor (i.e., ZIF-67) is transformed into H-Co₃O₄@H-C, in which hollow Co₃O₄ (H-Co₃O₄) nanoparticles (NPs) are embedded in hollow carbon (H-C) shell. The hollow Co₃O₄ NPs feature rich oxygen vacancies and finish a complete conversion of CO at 130°C, which is much lower than that of solid Co₃O₄ (the temperature of full CO conversion T₁₀₀=220°C). Besides, the hollow carbon shell could also reduce the diffusion resistance during the oxidation process. Benefiting from the unique hollow structures, H-Co₃O₄@H-C even shows comparable activity to noble metal catalysts under high weight hourly space velocities (WHSVs) up to 240,000 mL h⁻¹ g_cat.⁻¹. Furthermore, the H-Co₃O₄@H-C catalyst also shows good durability with only a slight decline after the reaction has been operated for 24 h.

Co ₃ O ₄被认为是一种有前景的CO氧化催化剂。根据Mars-van Krevelen机理，Co ₃ O _4的氧空位在催化活性中起着重要作用。在这里，我们报告了一种新颖的结构诱导策略，以开发具有丰富氧空位的中空Co ₃ O ₄来有效氧化CO。通过还原-氧化热解过程，金属有机骨架（MOFs）前体（即ZIF-67 ）转化为H-Co ₃ O ₄ @HC，其中空心的Co ₃ O ₄（H-Co ₃ O ₄纳米粒子（NPs）嵌入空心碳（HC）外壳中。中空的Co ₃ O ₄ NP具有丰富的氧空位，并且在130°C时完成了CO的完全转化，这远低于固态的Co ₃ O ₄（完全CO转化的温度T ₁₀₀ = 220°C）。此外，中空碳壳还可以降低氧化过程中的扩散阻力。得益于独特的中空结构，H-Co ₃ O ₄ @HC甚至在高达240000 mL h ^-1 g _cat的高重量小时空速（WHSVs）下也表现出与贵金属催化剂相当的活性_。^-1。此外，H-Co反应进行24小时后，₃ O ₄ @HC催化剂也显示出良好的耐久性，仅略有下降。