Electrochemistry of Shape-Controlled Catalysts: Oxygen Reduction Reaction on Cubic Gold Nanoparticles

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• 作者：Javier Hern&aacute ; ndez ; José ; Solla-Gulló ; n ; Enrique Herrero ; Antonio Aldaz ; Juan M. Feliu
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：September 27, 2007
• 年：2007
• 卷：111
• 期：38
• 页码：14078 - 14083
• 全文大小：203K
• 年卷期：v.111,no.38(September 27, 2007)
• ISSN：1932-7455

文摘

This paper describes the electrochemical behavior of shape controlled, deliberately large Au nanoparticlesthat have been synthesized using a seed-mediated growth method in the presence of cetyl trimethyl ammoniumbromide. Transmission electron microscopy micrographs and selected area electron diffraction patterns revealed40 nm Au nanoparticles with a preferentially cubic shape suggesting a high amount of (100) surface sites. Insitu electrochemical structure-sensitive reactions such as lead underpotential deposition confirm that the surfaceof the nanoparticles contains a large quantity of wide (100) domains. As a consequence, the nanoparticlesshowed a very high catalytic activity for the four electron oxygen reduction paths in alkaline media. Thus,water was obtained as the final product of the reaction in the whole potential range, while hydrogen peroxidewas obtained only in the lower potential region, in a similar way as reported for Au (100) electrodes.