Tailoring Galvanic Replacement Reaction for the Preparation of Pt/Ag Bimetallic Hollow Nanostructures with Controlled Number of Voids
Tailoring Galvanic Replacement Reaction for the Preparation of Pt/Ag Bimetallic Hollow Nanostructures with Controlled Number of Voids
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DOI：
10.1021/nn302590k
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发表时间：
2012-08-01
期刊：
影响因子：
17.1
通讯作者：
Lu, Xianmao
中科院分区：
文献类型：
--
作者：
Zhang, Weiqing;Yang, Jizheng;Lu, Xianmao
在此，我们报道了通过一种定制的电置换反应（GRR）合成具有可控空隙数量的铂/银双金属纳米结构。以银纳米立方体（NCs）为模板，在盐酸存在的条件下与铂离子发生反应。在电置换反应中使用盐酸导致氯化银迅速沉淀，氯化银在银纳米立方体表面生长，并作为一种可去除的二次模板用于铂的沉积。通过控制加入到银纳米立方体中的盐酸量，或者通过向反应中引入聚乙烯吡咯烷酮（PVP），可以调整氯化银的成核位点数量。这一策略导致形成了由一个、两个或多个中空区域组成的铂/银中空纳米盒、二聚体、多聚体或爆米花状纳米结构。由于存在大的空隙空间和多孔壁，这些纳米结构表现出高的表面积以及对甲醇氧化反应有所提高的催化活性。
Here we report the synthesis of Pt/Ag bimetallic nanostructures with controlled number of void spaces via a tailored galvanic replacement reaction (GRR). Ag nanocubes (NCs) were employed as the template to react with Pt ions in the presence of HCl. The use of HCl In the GRR caused rapid precipitation of AgCl, which grew on the surface of Ag NCs and acted as a removable secondary template for the deposition of Pt. The number of nucleation sites for AgCl was tailored by controlling the amount of HCl added to the Ag NCs or by introducing PVP to the reaction. This strategy led to the formation of Pt/Ag hollow nanoboxes, dimers, multimers, or popcorn-shaped nanostructures consisting of one, two, or multiple hollow domains. Due to the presence of large void space and porous walls, these nanostructures exhibited high surface area and improved catalytic activity for methanol oxidation reaction.