Imaging Structure Sensitive Catalysis on Different Shape-Controlled Platinum Nanoparticles
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- 作者：Carlos M. Snchez-Snchez ; Jos Solla-Gulln ; Francisco J. Vidal-Iglesias ; Antonio Aldaz ; Vicente Montiel ; Enrique Herrero
- 刊名：Journal of the American Chemical Society
- 出版年：2010
- 出版时间：April 28, 2010
- 年：2010
- 卷：132
- 期：16
- 页码：5622-5624
- 全文大小：215K
- 年卷期：v.132,no.16(April 28, 2010)
- ISSN：1520-5126
文摘
The structure sensitive catalytic activity for oxygen reduction reaction (ORR) on shape-controlled Pt nanoparticles (NPs) is directly imaged using scanning electrochemical microscopy (SECM). We synthesize and compare four types of Pt NPs: spherical, cubic, hexagonal, and tetrahedral-octahedral. Our SECM images show the hexagonal Pt NPs displaying the highest activity for ORR in two acid electrolytes. Meanwhile, cubic and tetrahedral-octahedral NPs drastically change their activity depending on specific adsorption of the different anions in solution. The NPs morphology produces predominant crystallographic planes at the surface of these shape-controlled Pt NPs, which are responsible for their different catalytic activity. Our results translate the studies on Pt single crystal electrodes present in the literature into Pt NPs that are useful as a catalyst in real fuel cells.