Fabrication of UiO-66-NH2/Ce(HCOO)3 heterojunction with enhanced photocatalytic reduction of CO2 to CH4. (October 2022)

• Record Type: Journal Article
• Authors: Yuan, Nicui; Mei, Yuxin; Liu, Yuwei; Xie, Yating; Lin, Baining; Zhou, Yonghua
• Is Part Of: Journal of CO₂ utilization. Volume 64(2022)
• Publication Date: 2022-10
• Subjects: CO2 photocatalytic reduction -- UiO-66-NH2 -- Ce(HCOO)3 -- Heterojunction; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2022.102151
• Languages: English
• ISSNs: 2212-9820

Abstract

Abstract: The development of efficient and highly selective photocatalysts is a key point for the photocatalytic conversion of CO2 . In this paper, a composite catalyst UiO-66-NH2 /Ce(HCOO)3 (simplified to UNH/Ce(HCOO)3 ) was fabricated by one pot method with CeCO3 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 CH4 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 CH4 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 CO2 reduction performance and high CH4 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 CO2 to CH4 . 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. Graphical Abstract: The combination of Ce(HCOO)3 and UNH into type-II heterojunction can significantly improve the yield and selectivity. ga1 Highlights: 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 CH4 yield over the catalyst reached 128.81 μmol g −1 with 71.9 % CH4 selectivity. The effect of reaction temperature on the stability of the catalyst was studied.