Economic Hydrophobicity Triggering of CO2 Photoreduction for Selective CH4 Generation on Noble-Metal-Free TiO2–SiO2

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• 作者：Chunyang Dong ; Mingyang Xing ; Jinlong Zhang
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：August 4, 2016
• 年：2016
• 卷：7
• 期：15
• 页码：2962-2966
• 全文大小：399K
• 年卷期：0
• ISSN：1948-7185

文摘

On the basis of the fact that the competitive adsorption between CO₂ and H₂O on the catalyst plays an important role in the CO₂ photoreduction process, here we develop an economic NH₄F-induced hydrophobic modification strategy to enhance the CO₂ competitive adsorption on the mesoporous TiO₂–SiO₂ composite surface via a simple solvothermal method. After the hydrophobic modification, the CO₂ photoreduction for the selective generation of CH₄ over the noble-metal-free TiO₂–SiO₂ composite can be greatly enhanced (2.42 vs 0.10 μmol/g in 4h). The enhanced CO₂ photoreduction efficiency is assigned to the rational hydrophobic modification on TiO₂–SiO₂ surface by replacing Si–OH to hydrophobic Si–F bonds, which will improve the CO₂ competitive adsorption and trigger the eight-electron CO₂ photoreduction on the reaction kinetics.