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

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Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P.R. China
*M.X.: E-mail: [email protected]
*J.Z.: E-mail: [email protected]
Cite this: J. Phys. Chem. Lett. 2016, 7, 15, 2962–2966
Publication Date (Web):July 14, 2016
Copyright © 2016 American Chemical Society
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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.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpclett.6b01287.

  • Detailed experimental procedures; CO2 photoreduction setup diagram; and characterization methods and figures of BET, XRD, FT-IR, XPS, UV-DRS. (PDF)

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