A high visible-light active TiO₂ photocatalyst was prepared by simultaneously constructing ordered nanosheet structure and decoration of a homogeneous carbon layer from a single 2D MXene precursor. The TiO₂ nanosheets/C composite exhibited a boosted photocatalytic activity under visible light condition up to three times of benchmark Degussa P25. It was revealed that the high photocatalytic activity can be ascribed to three major aspects. One was that the stacked nanosheets with ordered structure inherited from the 2D MXene, endowed a favorable electron-hole separation and transportation. The second was the decoration of carbon layer that evidently extended the absorption to more visible light region. Besides, the carbon layer also facilitated the separation and migration of photogenerated carriers. The proposed in-situ carbonization strategy with a uniformly decoration on TiO₂ with remarkable visible light photocatalytic activity would greatly promote the wide application of TiO₂ such as in photocatalytic water splitting.

通过同时构建有序的纳米片结构并装饰单个2D MXene前驱体的均质碳层，制备了高可见光活性TiO ₂光催化剂。TiO ₂纳米片/ C复合材料在可见光条件下显示出增强的光催化活性，最高可达基准Degussa P25的三倍。揭示了高的光催化活性可以归因于三个主要方面。一个是从2D MXene继承的具有规则结构的堆叠纳米片，具有良好的电子-空穴分离和传输能力。第二个是装饰碳层，显然将吸收范围扩展到了更多可见光区域。此外，碳层还促进了光生载流子的分离和迁移。提出的具有均匀可见光催化活性的TiO ₂上均匀装饰的原位碳化策略将极大地促进TiO ₂的广泛应用 例如在光催化水分解中。