Li Shuang, Zhao Jinhua, Liu Guiyuan, Xu Linlin, Tian Yue, Jiao Anxin, Chen Ming
School of Science, Shandong Jianzhu University, Jinan, 250101, People's Republic of China.
School of Physics, Shandong University, Jinan, 250100, People's Republic of China.
Nanotechnology. 2021 Mar 19;32(12):125401. doi: 10.1088/1361-6528/abd128.
Plasmonic metallic nanostructure with unique hot carrier-driven photocatalysis has recently emerged as a promising photocatalyst. Herein, we show that the plasmonic photocatalysis can be significantly promoted by supporting bimetallic Au@Ag nanoalloys (NAs) on graphene oxide (GO). The obtained Au@Ag/GO (molar ratio of Au to Ag∼3:1) with improved synergistic effects provides a remarkable higher visible-light (>400 nm) photocatalytic activity for a complete degradation (99.36%) of tetracycline hydrochloride (TCH) molecules within 70 min, while about 61.74% or 62.38% via monometallic Au/GO or Ag/GO. The optimum photocatalytic performance is attributed to the production of high yield hot carriers on NAs with enhanced localized surface plasmon resonance property and the pronounced photoinduced electron-transfer ability of modified GO support by overgrowth of NAs. These findings enable the optimal Au@Ag/GO to become an appealing high-performance photocatalyst for promoting diverse photochemical reactions.
具有独特热载流子驱动光催化性能的等离子体金属纳米结构最近已成为一种很有前途的光催化剂。在此，我们表明，通过在氧化石墨烯（GO）上负载双金属Au@Ag纳米合金（NAs），可以显著促进等离子体光催化。所制备的具有改善协同效应的Au@Ag/GO（Au与Ag的摩尔比约为3:1）在70分钟内对盐酸四环素（TCH）分子的完全降解（99.36%）表现出显著更高的可见光（>400nm）光催化活性，而通过单金属Au/GO或Ag/GO时降解率约为61.74%或62.38%。最佳光催化性能归因于具有增强的局域表面等离子体共振特性的NAs上高产热载流子的产生，以及NAs过度生长对改性GO载体显著的光致电子转移能力。这些发现使最佳的Au@Ag/GO成为促进各种光化学反应的有吸引力的高性能光催化剂。
