Comparative study of CO2 photoreduction using different conformations of CuO photocatalyst: Powder, coating on mesh and thin film. Issue 50 (August 2021)

• Record Type: Journal Article
• Authors: Ávila-López, Manuel Alejandro; Gavrielides, Stelios; Luo, XiaoJiao; Ojoajogwu, Abah Ezra; Tan, Jeannie Z.Y.; Luévano-Hipólito, E.; Torres-Martínez, Leticia M.; Maroto-Valer, M. Mercedes
• Is Part Of: Journal of CO₂ utilization. Issue 50(2021)
• Publication Date: 2021-08
• Subjects: Photocatalysis -- Thin film -- CuO -- Powders -- Solar fuels; 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.2021.101588
• Languages: English
• ISSNs: 2212-9820

Abstract

Graphical abstract: Highlights: Comparative evalution of CuO powders, films and coatings for CO2 photocatalytic reduction. CuO showed selectivity to only produce CH4 in the CO2 photocatalytic reduction. Active sites favored the formation of mono and bidentate bonds between CO2 and CuO. Abstract: The use of CuO-based photocatalysts for CO2 photoreduction has been extensively reported in the literature. However, the comparison of the photocatalytic activity and selectivity from the published results becomes difficult due to different experimental conditions ( i.e., synthesis method, configuration of photocatalyst, flow rate of gas, water content, light intensity) and reactor geometry employed. Hence, in this work different conformations of CuO-based photocatalyst, namely powder ( i.e., synthesized using precipitation, sonochemical and hydrothermal-microwave treatment), coating on glass fiber mesh, and thin film, were tested using the same photoreactor and experimental conditions. All CuO photocatalysts exhibited 100 % product selectivity towards CH4 over CO and the CuO coating on the glass fiber mesh exhibited the highest production of CH4 (56.3 μmol gcat −1 h −1 ). The morphology, particle size, particle dispersity, and presence of impurities/defects within the CuO photocatalysts had a significant effect on photocatalytic activity. A numerical model, which was built using COMSOL, revealed that the experimental data obtained in this simulated photocatalytic activity study fitted well, however, further optimization was needed.