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Understanding oxygen vacant hollow structure CeO2@In2O3 heterojunction to promote CO2 reduction

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Abstract

In order to reduce the impact of greenhouse gases, we have studied a new and efficient photocatalyst to reduce CO2. We recombined the hollow CeO2 with the In2O3 and introduced the oxygen vacancy to obtain the CeO2@In2O3 for the hollow structure of the oxygen vacancy. The test results show that CeO2@In2O3 with oxygen vacancy hollow structure (hereinafter collectively referred to as H-CeO2, H-In2O3, and H-CeO2–x@In2O3–x) have higher photocatalytic reduction activity of CO2 than hollow CeO2 and hollow In2O3. When the illumination time was 4 h, the yields of carbon dioxide reduction to CO and methane were 38.7 and 7.8 μmol·g−1, respectively. Consequently, we explained the photocatalytic reduction mechanism, and carried out the X-ray diffraction (XRD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analysis of H-CeO2, H-In2O3, and H-CeO2–x@In2O3–x. This study summarizes some experience for the study of oxygen vacancy hollow structure photocatalyst, and provides some new ideas in the field of photocatalytic reduction of CO2.

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摘要

为了减少温室气体的影响，我们研究了一种新型高效降低二氧化碳的光催化剂。我们将中空CeO2与In2O3复合，并引入氧空位，得到了氧空位中空结构的CeO2@In2O3异质结。试验结果表明，与中空CeO2和中空In2O3相比，具有氧空位中空结构的CeO2@In2O3异质结（以下统称为H-CeO2、H-In2O3和H-CeO2-x@In2O3-x）具有较高的二氧化碳光催化还原活性。当光照时间为4h时，二氧化碳还原为CO和CH4的产率分别为38.7和7.8 μmol·g-1。因此，我们解释了光催化还原机理，并对H-CeO2、H-In2O3和H-CeO2-x@In2O3-x进行了XRD和in-situ DRIFTS等分析。本研究总结了氧空位中空结构光催化剂的研究经验，并为二氧化碳的光催化还原领域提供了一些新的思路。

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 52064049), the Key National Natural Science Foundation of Yunnan Province (Nos. 2018FA028 and 2019FY003023), the International Joint Research Center for Advanced Energy Materials of Yunnan Province (No. 202003AE140001), the Key Laboratory of Solid State Ions for Green Energy of Yunnan University (2019) and the Analysis and Measurements Center of Yunnan University for the Sample Testing Service.

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  1. Qi-Jun Xu and Jing-Wen Jiang have contributed equally to this work.

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  1. School of Materials and Energy, Yunnan Key Laboratory for Micro/Nano Materials and Technology, Yunnan University, Kunming, 650091, China

    Qi-Jun Xu, Jing-Wen Jiang, Xiao-Feng Wang, Ling-Yan Duan & Hong Guo

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Xu, QJ., Jiang, JW., Wang, XF. et al. Understanding oxygen vacant hollow structure CeO2@In2O3 heterojunction to promote CO2 reduction. Rare Met. 42, 1888–1898 (2023). https://doi.org/10.1007/s12598-022-02244-2

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