Abstract
TiO2 is an ideal semiconductor material for photocatalytic applications. However, inadequate visible light response and fast recombination of charge carriers restrict its photocatalytic performance. Constructing a junction structure between TiO2 and carbon nanomaterials can solve the above shortcomings. In the present work, two-dimensional (2D) transition metal carbides (Ti3C2) were synthesized from the Ti3AlC2 MAX phase firstly. Then the porous carbon-supported TiO2 (TiO2@C) hybrids were in-situ synthesized by calcination in air. Also, the pristine Ti3C2 was exfoliated by intercalation with dimethyl sulfoxide (DMSO). The exfoliation TiO2@C catalyst was in-situ prepared by freeze-drying and calcining, and it delivered an enhanced visible-light-driven photocatalytic H2 evolution rate of 160.42 µmol·h−1·g−1, 13 times higher than the primary TiO2@C catalyst. The enhanced photocatalytic activity results from the increased specific surface area, facilitating charge separation and elevated conduction band. The paper indicates that MXene oxidation can further apply in the visible light photocatalysis.
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