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Highly enhanced photocatalytic activity of WO3 thin films loaded with Pt–Ag bimetallic alloy nanoparticles

机译：Pt-Ag双金属合金纳米粒子负载的WO 3 薄膜的光催化活性大大增强

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摘要

WO3 thin films loaded with Pt–Ag bimetallic alloy nanoparticles were successfully synthesized by a three-step method involving the formation of a homogeneous precursor sol, spin coating as well as UV-light reduction, and calcination. Moreover, a systematic, comparative study of the microstructure, chemical environment and electrochemical characteristics of the as-prepared Pt/WO3, Ag/WO3, and Pt–Ag/WO3 thin films was carried out. It was found that the Pt–Ag/WO3 thin film exhibited a highly enhanced photocatalytic performance for the degradation of methylene blue solution compared with the pure WO3, Pt/WO3 and Ag/WO3 thin films. Based on the experimental results and the energy-band diagrams, the transfer paths of photogenerated charges and the enhanced photocatalytic mechanism were proposed. It was suggested that the photogenerated electrons from the conduction band of WO3 first transferred to Ag and then to Pt in the Pt–Ag/WO3 sample during the photocatalytic process, promoting the efficient two-electron reduction of O2 compared to in the Pt/WO3 and Ag/WO3 samples. In addition, this process prevented the oxidation of Ag in the Pt–Ag/WO3 sample during the photodegradation process in air. Overall, this study provides a novel approach to design efficient photocatalysts decorated by bimetallic alloy nanoparticles.
机译：通过三步法成功合成了负载Pt-Ag双金属合金纳米颗粒的WO 3 薄膜，该方法涉及均相前体溶胶的形成，旋涂以及UV -减光和煅烧。此外，对制备的Pt / WO 3 ，Ag / WO 3的微观结构，化学环境和电化学特性进行了系统的比较研究。 和Pt–Ag / WO 3 薄膜。结果发现，与纯WO 相比，Pt-Ag / WO 3 薄膜对亚甲基蓝溶液的降解具有更高的光催化性能。 > 3 ，Pt / WO 3 和Ag / WO 3 薄膜。根据实验结果和能带图，提出了光生电荷的传递路径和增强的光催化机理。有人认为，WO 3 的导带中的光生电子首先转移到Ag中，然后转移到Pt–Ag / WO 3中的Pt中。 样品在光催化过程中，与Pt / WO 2 的有效两电子还原相比> 3 和Ag / WO 3 样本。此外，该过程防止了Pt–Ag / WO 3 样品在空气中光降解过程中Ag的氧化。总体而言，这项研究提供了一种新颖的方法来设计由双金属合金纳米粒子修饰的高效光催化剂。

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