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

• Published in: Rare metals Vol. 42; no. 6; pp. 1888 - 1898
• Main Authors: Xu, Qi-Jun, Jiang, Jing-Wen, Wang, Xiao-Feng, Duan, Ling-Yan, Guo, Hong
• Format: Journal Article
• Language: English
• Published: Beijing Nonferrous Metals Society of China 01.06.2023; Springer Nature B.V
• Subjects: Biomaterials; Carbon dioxide; Cerium oxides; Chemistry and Materials Science; Energy; Fourier transforms; Greenhouse gases; Heterojunctions; Indium oxides; Infrared analysis; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Original Article; Oxygen; Photocatalysis; Photocatalysts; Physical Chemistry; Reduction; Hollow structure; H-CeO; @In; Photocatalytic CO; reduction; O; Oxygen vacancy
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-022-02244-2

In order to reduce the impact of greenhouse gases, we have studied a new and efficient photocatalyst to reduce CO 2 . We recombined the hollow CeO 2 with the In 2 O 3 and introduced the oxygen vacancy to obtain the CeO 2 @In 2 O 3 for the hollow structure of the oxygen vacancy. The test results show that CeO 2 @In 2 O 3 with oxygen vacancy hollow structure (hereinafter collectively referred to as H-CeO 2 , H-In 2 O 3 , and H-CeO 2– x @In 2 O 3– x ) have higher photocatalytic reduction activity of CO 2 than hollow CeO 2 and hollow In 2 O 3 . 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-CeO 2 , H-In 2 O 3 , and H-CeO 2– x @In 2 O 3– 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 CO 2 . Graphical abstract