MOFs诱导中空Co3O4/CdIn2S4合成及光催化CO2还原性能研究

doi:10.11949/0438-1157.20191416

摘要/Abstract

摘要：

光催化二氧化碳转化技术，不仅可以利用取之不尽用之不竭的太阳光能，而且可将二氧化碳转化为高附加值的碳基燃料，受到研究者们的广泛关注。实验设计合成了新颖的中空结构的Co₃O₄/CdIn₂S₄异质结光催化剂。两种半导体的高效耦合作用极大地促进了光生载流子分离，同时形成更多暴露活性位点。基于异质结独特的结构优势，表现出高效的CO₂还原性能，5% Co₃O₄/CdIn₂S₄的CO生成速率达74 μmol·g^-1·h^-1，与单体CdIn₂S₄相比，不仅活性得到很大提升，同时CO选择性达到100%。

关键词: 光催化, CO₂还原, 中空, Co₃O₄/CdIn₂S₄异质结

Abstract:

Photocatalytic carbon dioxide conversion technology can not only use inexhaustible solar energy, but also convert carbon dioxide into high-value-added carbon-based fuels, which has attracted extensive attention from researchers. Herein, we designed and fabricated the Co₃O₄/CdIn₂S₄ heterojunction photocatalyst with hollow structure to convert CO₂. With series of measurement, the results show that the efficient coupling of the two materials could greatly promote photo-generated carriers separation and press the recombination of that, meanwhile, the introduction of MOFs template could help catalyst to expose more active sites. Based on the above unique advantages and compared to the pure CdIn₂S₄, the 5% Co₃O₄/CdIn₂S₄ heterojunction performs well in whole photocatalytic reduction process, which can generate the CO. And CO generation rate could be up to 74 μmol·g^-1·h^-1 and selectivity could be 100%.

Key words: photocatalytic, CO₂reduction, hollow, Co₃O₄/CdIn₂S₄heterojunction

中图分类号:

O 643

杨金曼, 朱兴旺, 周固礼, 许晖, 李华明. MOFs诱导中空Co₃O₄/CdIn₂S₄合成及光催化CO₂还原性能研究[J]. 化工学报, 2020, 71(6): 2780-2787.

Jinman YANG, Xingwang ZHU, Guli ZHOU, Hui XU, Huaming LI. Preparation of MOFs-derived hollow Co₃O₄/CdIn₂S₄ heterojunction with enhanced photocatalytic carbon dioxide reduction activity[J]. CIESC Journal, 2020, 71(6): 2780-2787.

图/表 11

图1 样品Co3O4和5% Co3O4/CdIn2S4的XRD谱图

Fig.1 XRD patterns of Co3O4 and 5% Co3O4/CdIn2S4

图2 样品5% Co3O4/CdIn2S4的XPS谱图

Fig.2 XPS spectra of 5% Co3O4/CdIn2S4

图3 样品的SEM图

Fig.3 SEM images of samples

图4 5% Co3O4/CdIn2S4的TEM图

Fig.4 TEM image of 5% Co3O4/CdIn2S4

图5 5% Co3O4/CdIn2S4的HRTEM图

Fig.5 HRTEM image of 5% Co3O4/CdIn2S4

图6 不同样品的紫外可见光响应谱图

Fig.6 UV-vis absorption spectra of different samples

图7 Co3O4和5% Co3O4/CdIn2S4的N2吸附-脱附曲线

Fig.7 N2 adsorption-desorption isotherms of Co3O4 and 5% Co3O4/CdIn2S4

图8 不同样品的光电流响应谱图

Fig.8 Time-dependent photocurrent responses over different samples

图9 不同样品的光催化CO2还原性能

Fig.9 Photocatlaytic CO2 reduction rate over different samples

图10 不同反应条件下光催化CO2还原性能

Fig.10 Control experiments under different reaction conditions

图11 5% Co3O4/CdIn2S4样品稳定性测试图

Fig.11 Photocatalytic stability of 5% Co3O4/CdIn2S4

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MOFs诱导中空Co₃O₄/CdIn₂S₄合成及光催化CO₂还原性能研究

Preparation of MOFs-derived hollow Co₃O₄/CdIn₂S₄ heterojunction with enhanced photocatalytic carbon dioxide reduction activity

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