TiO2 sensitized by red-, green-, blue-emissive carbon dots for enhanced H2 production

Carbon dots(Cdots) with a broad light absorption range could be a potential stable sensitizer for TiO,which is an excellent ultraviolet(UV) response photocatalyst. Herein, we systematically investigated the different color emissive Cdots-sensitized TiOfor Hproduction.Firstly, all kinds of Cdots enhanced the photocatalytic properties of TiO. All the Cdots-sensitized TiOexhibits visible light Hproduction due to their absorption in the visible light region. The photocurrent and Hproduction amount display strong dependence on the light absorption range of Cdots. The blue-emissive Cdots endow the weak Hproduction rate due to its weak absorption in the visible light. The enhanced photocatalytic activities are mainly contributed to the strong light absorbance and high-efficient charge separation. The light absorption of green-and red-emissive Cdots is another main factor for the high catalytic activities besides charge separation.