Zuo Gancheng, Wang Yuting, Teo Wei Liang, Xie Aming, Guo Yang, Dai Yuxuan, Zhou Weiqiang, Jana Deblin, Xian Qiming, Dong Wei, Zhao Yanli
Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore.
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, P. R. China.
Angew Chem Int Ed Engl. 2020 Jul 6;59(28):11287-11292. doi: 10.1002/anie.202002136. Epub 2020 May 7.
Photocatalysts derived from semiconductor heterojunctions that harvest solar energy and catalyze reactions still suffer from low solar-to-hydrogen conversion efficiency. Now, MXene (Ti C T ) nanosheets (MNs) are used to support the in situ growth of ultrathin ZnIn S nanosheets (UZNs), producing sandwich-like hierarchical heterostructures (UZNs-MNs-UZNs) for efficient photocatalytic H evolution. Opportune lateral epitaxy of UZNs on the surface of MNs improves specific surface area, pore diameter, and hydrophilicity of the resulting materials, all of which could be beneficial to the photocatalytic activity. Owing to the Schottky junction and ultrathin 2D structures of UZNs and MNs, the heterostructures could effectively suppress photoexcited electron-hole recombination and boost photoexcited charge transfer and separation. The heterostructure photocatalyst exhibits improved photocatalytic H evolution performance (6.6 times higher than pristine ZnIn S ) and excellent stability.
源自能收集太阳能并催化反应的半导体异质结的光催化剂，其太阳能到氢能的转换效率仍然较低。现在，MXene（Ti₃C₂Tₓ）纳米片（MNs）被用于支持超薄ZnIn₂S₄纳米片（UZNs）的原位生长，从而制备出三明治状的分级异质结构（UZNs-MNs-UZNs）用于高效光催化析氢。UZNs在MNs表面的适时横向外延提高了所得材料的比表面积、孔径和亲水性，所有这些都有利于光催化活性。由于UZNs和MNs的肖特基结和超薄二维结构，该异质结构可以有效抑制光激发电子-空穴复合，并促进光激发电荷转移和分离。这种异质结构光催化剂表现出改善的光催化析氢性能（比原始ZnIn₂S₄高6.6倍）和优异的稳定性。
