AuCu intermetallic nanoparticles: surfactant-free synthesis and novel electrochemistry
AuCu intermetallic nanoparticles: surfactant-free synthesis and novel electrochemistry
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DOI：
10.1039/c2jm32264a
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发表时间：
2012-07
影响因子：
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通讯作者：
Gongwei Wang;Li Xiao;Bing-Shun Huang;Zhandong Ren;Xun Tang;L. Zhuang;Juntao Lu
中科院分区：
文献类型：
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作者：
Gongwei Wang;Li Xiao;Bing-Shun Huang;Zhandong Ren;Xun Tang;L. Zhuang;Juntao Lu
在本工作中，采用一锅法合成负载在高表面积碳上的AuCu金属间纳米颗粒（AuCu iNPs）。为了避免阻塞AuCu iNPs的活性位点用于随后的电催化研究，在整个合成过程中没有应用表面活性剂。在300 °C的甘油中浸渍后，碳载AuCu iNPs形成了有序结构，X射线衍射（XRD）和透射电子显微镜（TEM）表征表明其具有明显的超晶格结构。这种金属间纳米颗粒显示出非常有趣的电化学行为，迄今为止还没有在文献中报道。除了独特的循环伏安法（CV），AuCu iNPs表现出上级催化活性，相比于普通的Au纳米颗粒，对氧气还原反应（ORR）在碱性介质中。通过X射线光电子能谱（XPS）和密度泛函理论（DFT）计算研究了Cu掺杂对Au表面电子性质的影响。
In the present work, a one-pot method is employed to synthesize AuCu intermetallic nanoparticles (AuCu iNPs) supported on high-surface-area carbon. To avoid blocking the active sites of the AuCu iNPs for the subsequent study of electrocatalysis, no surfactant has been applied in the entire synthetic process. After refluxing in glycerol at 300 °C, the ordered structure is formed in the carbon-supported AuCu iNPs, whose superlattice is evidently demonstrated by the X-ray diffraction (XRD) and transmission electron microscopy (TEM) characterizations. Such intermetallic nanoparticles show very interesting electrochemical behaviors which have hitherto not been reported in the literature. In addition to the peculiar cyclic voltammetry (CV), the AuCu iNPs exhibit a superior catalytic activity, in comparison to that of ordinary Au nanoparticles, toward the oxygen reduction reaction (ORR) in alkaline media. The alteration in the surface electronic properties of Au, caused by the incorporation of Cu, has also been studied by X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations.