Zhou Boye, Yang Yong, Liu Zhengchu, Wu Niandu, Yan Yuxiang, Wenhua Zhao, He Huichao, Du Jun, Zhang Yongcai, Zhou Yong, Zou Zhigang
National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics, Nanjing University, Nanjing 210093, P. R. China.
Eco-Materials and Renewable Energy Research Center (ERERC), Jiangsu Key Laboratory for Nano Technology, Nanjing University, Nanjing, 210093, China.
Nanoscale. 2022 May 26;14(20):7538-7546. doi: 10.1039/d2nr01448c.
Designing efficient photocatalysts is vital for the photoreduction of CO to produce solar fuels, helping to alleviate issues of fossil fuel depletion and global warming. In this work, a novel ZnCr-LDH/TiCT Schottky junction is successfully synthesized using an coprecipitation method. ZnCr-LDH nanoflakes collectively grow on the surface of TiCT MXene nanosheets. When using TiCT MXene as a cocatalyst in the prepared heterojunction, the light absorption intensity, photo-induced electron separation and migration efficiency increase. As a result, the composite ZnCr-LDH/TiCT results in significant improvement in the performance of photocatalytic CO reduction under simulated solar irradiation. The optimized sample ZCTC25 has the highest photocatalytic CO reduction rates of 122.45 μmol g CO and 19.95 μmol g CH (after 6 h of irradiation). These values are approximately 2.65 times higher than those of pristine ZnCr-LDH. The product selectivity towards CO is 86%. This work provides a new method for the construction of novel 2D semiconductor photocatalysts and enriches the application of an unusual type of layered double hydroxides in the photoreduction of CO.
设计高效的光催化剂对于将CO光还原以生产太阳能燃料至关重要，有助于缓解化石燃料枯竭和全球变暖问题。在这项工作中，采用共沉淀法成功合成了一种新型的ZnCr-LDH/TiCT肖特基结。ZnCr-LDH纳米片共同生长在TiCT MXene纳米片的表面。当在制备的异质结中使用TiCT MXene作为助催化剂时，光吸收强度、光生电子分离和迁移效率提高。结果，复合ZnCr-LDH/TiCT在模拟太阳辐射下光催化CO还原性能得到显著改善。优化后的样品ZCTC25具有最高的光催化CO还原速率，分别为122.45 μmol g CO和19.95 μmol g CH（辐照6小时后）。这些值比原始ZnCr-LDH的值高约2.65倍。对CO的产物选择性为86%。这项工作为新型二维半导体光催化剂的构建提供了一种新方法，并丰富了一种特殊类型的层状双氢氧化物在CO光还原中的应用。
