Direct Z-scheme ZnO/CdS hierarchical photocatalyst for enhanced photocatalytic H2-production activity
Direct Z-scheme ZnO/CdS hierarchical photocatalyst for enhanced photocatalytic H2-production activity
复制标题
直接 Z 型 ZnO/CdS 分级光催化剂可增强光催化产氢活性
DOI：
10.1016/j.apcatb.2018.10.019
复制
发表时间：
2019-04-01
影响因子：
22.1
通讯作者：
Zhou, Minghua
中科院分区：
文献类型：
--
作者：
Wang, Sheng;Zhu, Bicheng;Zhou, Minghua
本文采用水热化学浴沉积法（CBD）制备了ZnO/CdS分级复合材料。测试了其光催化产氢性能。CdS的质量比对光吸收和光催化性能起着决定性的作用。值得注意的是，促进光催化H-2-生产活性的4134 μ mol g（-1）h（-1）的样品达到了最佳的CdS含量。值得注意的是，选择光致发光（PL）检测羟基自由基，以及原位XPS测量来验证直接Z-方案电荷迁移机制。这一机理赋予了复合材料较强的析氢能力，并阐明了其光催化性能的提高。其光催化活性的提高主要是由于纳米TiO 2的分级结构、扩展的可见光响应和直接的Z模式机理。本工作为构建具有高效光催化产氢活性的直接Z型光催化体系提供了新的思路。
Herein, ZnO/CdS hierarchical composite was prepared through a hydrothermal and chemical bath deposition (CBD) process. Its photocatalytic H-2-production performance was tested. Mass ratio of CdS acted a pivotal part in light absorption and photocatalytic properties. Noticeably, promoted photocatalytic H-2-production activity of 4134 mu mol g(-1)h(-1) was achieved by the sample with optimal CdS content. Significantly, the photoluminescence (PL) detection of hydroxyl radicals, as well as the in-situ XPS measurements was selected to verify the direct Z-scheme charge migration mechanism. This mechanism endowed the composite with strong capability for hydrogen evolution and elucidated the improved photocatalytic performance. The improvement of photocatalytic activity was due to hierarchical structure, extended visible light response and direct Z-scheme mechanism. This work will give an innovative vision in constructing direct Z-scheme photocatalytic system with great photo catalytic H-2-production activity.