One of the most promising solutions to the energy crisis is to convert CO2 to valuable organic products by means of solar energy through photocatalysis. However, high e-h recombination, low surface area and limited light absorption, limit the catalytic activity of the photocatalyst. In this context, carbon@TiO2 (C@TiO2) composite is promising, as carbon acts as an efficient electron sink improving e-h separation and its interface offers visible light absorption. However, the traditional C@TiO2 composite suffer from limited surface area and improper interfacial interactions. Here, we propose an ordered mesoporous C@TiO2 core-shell composite (TCM) as an efficient, high-performance photocatalyst for photothermocatalytic CO2 conversion to C1 hydrocarbons. A TiO2 shell encapsulating ordered mesoporous carbon core was successfully synthesized. Pristine carbon core shows 2D-hexagonal ordered mesoporous structure (~4 nm pores), indicating high surface area. Uniform TiO2 shell is formed as seen in SEM & EDS. Raman spectrum indicates anatase TiO2 coated over mesoporous carbon. Fluorescence spectra revealed improved e-h separation. DR-UV-Vis spectra showed improved visible light absorption (bandgap ~2.30 eV) due to the direct interface. Preliminary CO2 photothermal reduction results will be presented.

Ordered mesoporous carbon@TiO2 composite with direct interface as an efficient photocatalyst

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