Electrocatalytic Properties of Hollow Coral-like Platinum Mesocrystals
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- 作者：Tian Li ; Hongjun You ; Minwei Xu ; Xiaoping Song ; Jixiang Fang
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：December 26, 2012
- 年：2012
- 卷：4
- 期：12
- 页码：6942-6948
- 全文大小：399K
- 年卷期：v.4,no.12(December 26, 2012)
- ISSN：1944-8252
文摘
Controlling the morphology and size of Pt nanostructures can provide a great opportunity to improve their electrocatalytic properties and durability toward methanol oxidation. We successfully synthesized well-defined hollow coral-like Pt mesocrystals via a facile replacement reaction, using hierarchically structured Ag nanoparticles as the template. The as-synthesized coral-like Pt mesocrystals had hollow structures composed of porous walls that were 5鈥? nm thick, which were constructed from numerous pores (2 nm) and small (5 nm) Pt nanoparticle building units. These hollow and porous structures exhibited large electrochemical surface areas. The Pt mesostructures that have single-crystal inherence as well as hollow and porous features possess improved performance with respect to electrocatalytic activity (2.72 mA/cm2 at peak potential, which is 2.1 times greater than that of Pt black) and durability toward methanol oxidation.