Construction of TiO<sub>2</sub>/SrTiO<sub>3</sub> Heterojunction Derived from Monolayer Ti<sub>3</sub>C<sub>2</sub> MXene for Efficient Photocatalytic Overall Water Splitting
Zhenzhen Zhuo, Xue Wang, Cheng Shen, Mengdie Cai, Yong Jiang, Zhao‐Ming Xue, Zhiyuan Fu, Qi Wang, Yuxue Wei, Song Sun
Abstract
Abstract Construction of heterojunction at the atomic scale to ensure efficient charge separation for improvement of photocatalytic water splitting is challenging. Herein, a facile hydrothermal method has been applied for the in situ fabrication of TiO 2 /SrTiO 3 heterojunction, using the monolayer Ti 3 C 2 MXene as the template and reactant. It is found that the sample with the hydrothermal reaction time of 60 min exhibits the highest H 2 evolution rate with the sacrificial reagent, due to the efficient charge separation of TiO 2 /SrTiO 3 heterojunction as Ti 3 C 2 derivative. In addition, the sample shows the best overall water splitting performance at a hydrothermal reaction time of 120 min, where TiO 2 is nearly converted to SrTiO 3 , due to the fast kinetic process and low structural defects of SrTiO 3 . This work not only provides a simple strategy for the fabrication of heterojunction photocatalysts but also demonstrates the difference in optimization of half‐reaction and overall water splitting reaction.