双金属片
X射线光电子能谱
催化作用
材料科学
化学工程
微球
合金
同种类的
分子
猝灭(荧光)
化学
冶金
有机化学
物理
工程类
热力学
荧光
量子力学
作者
Shengpeng Mo,Peng Peng,Yinchang Pei,Taiming Shen,Qinglin Xie,Mingli Fu,Yunfa Chen,Daiqi Ye
标识
DOI:10.1016/j.cclet.2020.11.062
摘要
Herein, a facile glycol reduction route is successful employed to synthesize bimetallic PtAg alloys with homogeneous distribution of sizes and elements. Experimental studies reveal that the ultrafine PtAg alloys with well-defined sizes from around 3.3 nm to 5.8 nm are immobilized onto MnO2 microsphere, which remarkably enhances the catalytic performances for CO oxidation. Importantly, quasi in-situ X-ray photoelectron spectroscopy (XPS) result reveals that both Mn and Pt ions on the surface of catalysts would realize alternating reduction-oxidation by CO and O2 molecules, and the oxygen vacancy sites could be replenished and excited by gas-phase O2.
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