Glutathione-protected gold nanocluster decorated cadmium sulfide with enhanced photostability and photocatalytic activity
Glutathione-protected gold nanocluster decorated cadmium sulfide with enhanced photostability and photocatalytic activity
复制标题
谷胱甘肽保护的金纳米簇修饰的硫化镉具有增强的光稳定性和光催化活性
DOI：
10.1016/j.jcis.2018.06.055
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发表时间：
2018
影响因子：
9.9
通讯作者：
Guoliang Bai
中科院分区：
文献类型：
--
作者：
Shan Ling;Xiaofeng Cui;Xiaona Zhang;Bing Liu;Chengdong He;Junwei Wang;Wei Qin;Yuanguang Zhang;Yingchun Gao;Guoliang Bai
采用化学自组装方法制备了新型谷胱甘肽保护的金纳米簇（Aux-GSH NC）修饰的CdS光催化剂。用Aux-GSH NCs修饰光催化剂后，CdS的光催化活性和光稳定性显着增强。与纯CdS相比，所制备的CdS-Pt-Auc光催化剂表现出9倍的光电流和2.85倍的光催化活性。更重要的是，CdS 的光腐蚀（CdS 基光催化剂的一个关键缺点）得到了显着抑制。人们认为，CdS 和 Aux-GSH NC 之间的异质结构和匹配的能级是增强催化活性和光稳定性的关键。 Aux-GSH NCs的LUMO和HOMO水平分别高于CdS的导带和价带。通过异质结构，Aux-GSH NCs 的光生电子被注入到 CdS 中，而 CdS 的光生空穴则转移到 Aux-GSH NCs 中。电荷迁移的相反方向提高了电荷分离效率和平均寿命，从而大大增强了光活性，并且空穴从 CdS 到 Aux-GSH NC 的快速转移显着抑制了 CdS 的光腐蚀。
A Novel glutathione-protected gold nanocluster (Aux-GSH NC) decorated CdS photocatalyst was prepared using a chemical self-assembly method. After the photocatalyst was decorated with Aux-GSH NCs, the photocatalytic activity and photostability of CdS were remarkably enhanced. Compared to pure CdS, the as-prepared CdS-Pt-Aucphotocatalyst exhibited 9 times of photocurrent and 2.85 times of photocatalytic activity. More importantly, the photocorrosion of CdS, which is a critical drawback for CdS-based photocatalysts, was significantly suppressed. It is believed that the heterostructures and matched energy levels between CdS and Aux-GSH NCs are the key for enhance catalytic activity and photostability. The level of LUMO and HOMO of Aux-GSH NCs is higher the conduction band and valence band of CdS respectively. Through the heterostructures, the photogenerated electrons of Aux-GSH NCs are injected into the CdS, while the photogenerated holes of CdS transferred to the Aux-GSH NCs. The opposite directions of charge migration improves the charge separation efficiency and average lifetime, which drastically enhances the photoactivity, and the rapid transferring of holes from CdS to Aux-GSH NCs significantly suppresses the photocorrosion of CdS.