油胺
电化学
欠电位沉积
纳米线
材料科学
循环伏安法
化学工程
吸附
纳米颗粒
高分辨率透射电子显微镜
相(物质)
电催化剂
催化作用
纳米技术
透射电子显微镜
化学
电极
物理化学
有机化学
工程类
作者
Xuxu Ye,Bingyu Liu,Da Zhou,Yan‐Xia Chen
出处
期刊:Chinese Journal of Chemical Physics
[American Institute of Physics]
日期:2023-10-01
卷期号:36 (5): 533-544
标识
DOI:10.1063/1674-0068/cjcp2205095
摘要
Au nanowires in 4H crystalline phase (4H Au NWs) are synthesized by colloid solution methods. The crystalline phase and surface structure as well as its performance toward electrochemical oxidation of CO before and after removing adsorbed oleylamine molecules (OAs) introduced from its synthesis are evaluated by high-resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), underpotential deposition of Pb (Pb-upd) and cyclic voltammetry. Different methods, i.e. acetic acid cleaning, electrochemical oxidation cleaning, and diethylamine replacement, have been tried to remove the adsorbed OAs. For all methods, upon the removal of the adsorbed OAs, the morphology of 4H gold nanoparticles is found to gradually change from nanowires to large dumbbell-shaped nanoparticles, accompanying with a transition from the 4H phase to the face-centered cubic phase. On the other hand, the Pb-upd results show that the sample surfaces have almost the same facet composition before and after removal of the adsorbed OAs. After electrochemical cleaning with continuous potential scans up to 1.3 V, CO electro-oxidation activity of the 4H Au sample is significantly improved. The CO electro-oxidation activity is compared with results on the three basel Au single crystalline surfaces reported in the literature, possible origins for its enhancement are discussed.
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