Guo Xia, Ye Wei, Zhu Rui, Wang Wenxin, Xie Fang, Sun Hongyan, Zhao Qing, Ding Yi, Yang Jian
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, PR China.
Nanoscale. 2014 Oct 21;6(20):11732-7. doi: 10.1039/c4nr02982h. Epub 2014 Aug 26.
Anisotropic polymetallic hollow nanostructures are highly desired for many applications because of their unique morphology, large specific surface areas and attractive electronic effects. Here, a simple method using gold nanorods as a self-sacrificed template has been developed for the fabrication of hollow dumbbell-like nanorods of Au@PtAg. The formation of the hollow structures involves the growth of another metallic shell first, and then the etching of gold nanorods, which is induced by oxygen and ascorbic acid. The lattice mismatch and cohesive energy of the shell, along with its surface passivation, greatly affect the subsequent etching and the resulting products, as has been demonstrated by a positive control in the case of Rh and a negative control in the case of Pd. Hollow dumbbell-like nanorods of Au@PtAg show great enhancement for the dehydrogenation pathway in the oxidation of formic acid, as compared to solid Au@PtAg nanorods, PtAu nanotubes and commercial Pt/C.
各向异性多金属空心纳米结构因其独特的形态、大的比表面积和引人注目的电子效应而在许多应用中备受青睐。在此，已开发出一种以金纳米棒作为自牺牲模板的简单方法，用于制备Au@PtAg空心哑铃状纳米棒。空心结构的形成首先涉及另一种金属壳层的生长，然后是由氧气和抗坏血酸诱导的金纳米棒蚀刻。壳层的晶格失配和内聚能以及其表面钝化极大地影响了后续蚀刻及所得产物，如在Rh的情况下的正对照和Pd的情况下的负对照所证明的那样。与实心Au@PtAg纳米棒、PtAu纳米管和商业Pt/C相比，Au@PtAg空心哑铃状纳米棒在甲酸氧化的脱氢途径中表现出极大的增强作用。
