Fabrication of UiO-66-NH2/Ce(HCOO)3 heterojunction with enhanced photocatalytic reduction of CO2 to CH4

光催化 X射线光电子能谱 催化作用 选择性 扫描电子显微镜 异质结 材料科学 透射电子显微镜 产量(工程) 漫反射 吸收(声学) 漫反射红外傅里叶变换 光电子学 化学 化学工程 纳米技术 光化学 光学 工程类 有机化学 复合材料 物理 冶金
作者
Nicui Yuan,Yuxin Mei,Yuwei Liu,Yating Xie,Baining Lin,Yonghua Zhou
出处
期刊:Journal of CO2 utilization [Elsevier BV]
卷期号:64: 102151-102151 被引量:16
标识
DOI:10.1016/j.jcou.2022.102151
摘要

The development of efficient and highly selective photocatalysts is a key point for the photocatalytic conversion of CO 2 . In this paper, a composite catalyst UiO-66-NH 2 /Ce(HCOO) 3 (simplified to UNH/Ce(HCOO) 3 ) was fabricated by one pot method with CeCO 3 OH as the precursor. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) characterizations results confirmed that UNH was dispersed on the surface of Ce(HCOO) 3 and strongly interacted with it via Ce-N bond. The yield of CH 4 on the optimal UNH/Ce(HCOO) 3 catalyst reached 3 times of that on pristine UNH, up to 128.81 μmol g −1 , with the CH 4 selectivity of 71.9 %, and the R electron reached 286.46 μmol g −1 h −1 . The UV–vis diffuse reflection spectra and photoelectrochemical tests results confirmed that the improved photocatalytic CO 2 reduction performance and high CH 4 selectivity could be attributed to the formation of the type-Ⅱheterojunction of UNH/Ce(HCOO) 3 with abundant Ce 3+ , which expanded the visible light absorption range, accelerated the separation and transfer rates of photogenerated charges, and thus efficiently promoted the multi-electron reduction reaction of CO 2 to CH 4 . In addition, the reaction temperature affected profoundly the cycle performance of the catalyst. The results presented here illustrated the possibility for improving the stability of UNH/Ce(HCOO) 3 -1.80 by decreasing reaction temperature. The combination of Ce(HCOO) 3 and UNH into type-II heterojunction can significantly improve the yield and selectivity. • A heterojunction of UNH/Ce(HCOO) 3 was fabricated by one pot method. • The heterojunction of UNH/Ce(HCOO) 3 was featured with Ce-N bond. • The CH 4 yield over the catalyst reached 128.81 μmol g −1 with 71.9 % CH 4 selectivity. • The effect of reaction temperature on the stability of the catalyst was studied.
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