CDots-(001)TiO2纳米片的制备及光解水制氢性能

Preparation and Photocatalytic Water Splitting for H2 Production of CDots-(001)TiO2 nanosheets

摘要:

以钛酸四丁酯、氢氟酸和石墨棒为原料，采用简单的水热法将具有高催化活性的碳点负载在TiO2纳米片的(001)晶面上，制得CDots-(001)TiO2纳米片。通过TiO2纳米片高催化活性的(001)晶面与碳点的协同作用，提高TiO2纳米片的光吸收、载流子的传输和分离效率，从而有效地提高材料的光催化产氢性能。UV-vis DRS、PL、瞬态光响应分析结果表明，暴露(001)晶面的TiO2纳米片负载碳点后，可见光吸收增强，光生载流子的分离和传输速率加快，在间歇模拟太阳光照射下，CDots-(001)TiO2纳米片的光电流密度约为TiO2的4倍，CDots-(001)TiO2纳米片的光催化产氢速率达5859 μmol/(h·g)，量子效率达9.6％。

Abstract:

Using tetrabutyl titanate, hydrofluoric acid and graphite rod as raw materials, the carbon dots with high catalytic activity were loaded on the (001) crystal plane of TiO2 nanosheets by simple hydrothermal method to prepare CDots-(001) TiO2 nanosheets. Through the synergistic effect of the high catalytic activity of the (001) crystal plane and the carbon point, the light absorption, the transport and sepa-ration efficiency of carriers of TiO2 nanosheets improves, thus the hydrogen production performance of the material is effectively improved. The UV-vis DRS, PL, and transient photoresponse analysis results show that the visible light absorption of TiO2 nanosheets with exposed (001) crystal plane enhances after loading with carbon dots, and the separation and transmission rate of photogenerated carriers are accelerated. The photocurrent density of CDots-(001)TiO2 nanosheets is roughly fourth as high as that of TiO2 under intermittent visible light irradiation. The photocatalytic hydrogen production rate of CDots-(001)TiO2 nanosheets is up to 5859 μmol/(h·g), and the quantum efficiency is up to 9.6%.