Two-step pyrolytic engineering of carbon-doped Co3O4 with rich defects for efficient low-temperature CO oxidation,Journal of Materials Chemistry A

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Two-step pyrolytic engineering of carbon-doped Co3O4 with rich defects for efficient low-temperature CO oxidation
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/03/13 , DOI: 10.1039/c9ta13488c
Xi Chen _{1,

2,

3,

4,

5} , Juanjuan Li _{1,

2,

3,

4,

5} , Songcai Cai _{1,

2,

3,

4,

5} , Jing Chen _{4,

6,

7,

8,

9} , Hongpeng Jia _{1,

2,

3,

4,

5}

Affiliation

A series of carbon-doped Co₃O₄ samples with rich defects are rationally synthesized by two-step pyrolysis of ZIF-67 in different atmospheres. Specifically, Co₃O₄/C-300 exhibits the lowest apparent activation energy (E_a = 47.6 kJ mol⁻¹) and the highest activity (T_100% = 120 °C) for CO oxidation, as well as excellent catalytic stability for 50 cycles. The intensive investigation of the structural and physicochemical properties of the catalysts demonstrates that the excellent catalytic performance is predominantly attributed to the synergistic effects of abundant active Co³⁺ sites, good low-temperature reducibility, more active oxygen species and better oxygen storage capacity (OSC). Besides, the in situ DRIFTS analysis reveals that CO is oxidized by O_ads on the surface active sites of the material to finally form CO₂. Thus, these findings may shed light on the design of carbon-doped metal oxides to approach reactions with superior performance by tuning the defect concentration of the material.

中文翻译：

具有丰富缺陷的碳掺杂Co3O4的两步热解工程，可有效进行低温CO氧化

通过ZIF-67在不同气氛下的两步热解，合理地合成了一系列缺陷丰富的碳掺杂Co ₃ O ₄样品。具体而言，Co ₃ O ₄ / C-300表现出最低的表观活化能（E _a = 47.6 kJ mol ^-1）和最高的活性（T _100％ = 120°C），对CO氧化，并且对CO的催化稳定性优异。 50个循环。对催化剂的结构和物理化学性质的深入研究表明，优异的催化性能主要归因于丰富的活性Co ³⁺的协同作用。场所，良好的低温还原性，更多的活性氧种类和更好的储氧能力（OSC）。此外，原位DRIFTS分析表明，CO被O氧化_广告上的材料的最终形成CO表面活性位点₂。因此，这些发现可能为掺碳金属氧化物的设计提供启示，以通过调节材料的缺陷浓度来以优异的性能接近反应。

更新日期：2020-04-08

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