Tailoring galvanic replacement reaction for the preparation of Pt/Ag bimetallic hollow nanostructures with controlled number of voids.
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.
Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117576.
Weiqing
W
Zhang
Jizheng
J
Yang
Xianmao
X
Lu
D003460:Crystallization / Q000379:methods*; D004574:Electromagnetic Fields; D004595:Electroplating / Q000379:methods*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000528:radiation effects*; D008968:Molecular Conformation / Q000528:radiation effects; D010316:Particle Size; D010984:Platinum / Q000737:chemistry* / Q000528:radiation effects; D016062:Porosity / Q000528:radiation effects; D012834:Silver / Q000737:chemistry* / Q000528:radiation effects; D013499:Surface Properties / Q000528:radiation effects
D046911:Macromolecular Substances; D012834:Silver; D010984:Platinum