Selective deposition of Pt onto supported metal clusters for fuel cell electrocatalysts

被引：15

作者：

Jeon, Tae-Yeol ^{[1
]}

Pinna, Nicola ^{[1
,2
]}

Yoo, Sung Jong ^{[3
]}

Ahn, Docheon ^{[4
]}

Choi, Sun Hee ^{[4
]}

Willinger, Marc-Georg ^{[5
]}

Cho, Yong-Hun ^{[6
]}

Lee, Kug-Seung ^{[1
]}

Park, Hee-Young ^{[3
]}

Yu, Seung-Ho ^{[1
]}

Sung, Yung-Eun ^{[1
]}

机构：

[1] Seoul Natl Univ, World Class Univ WCU Program Chem Convergence Ene, Sch Chem & Biol Engn, Coll Engn, Seoul, South Korea

[2] Univ Aveiro, Dept Chem, CICECO, P-3810193 Aveiro, Portugal

[3] Korea Inst Sci & Technol, Fuel Cell Ctr, Seoul 136791, South Korea

[4] Pohang Univ Sci & Technol, Pohang Accelerator Lab, Pohang 790784, South Korea

[5] Max Planck Gesell, Fritz Haber Inst, Dept Inorgan Chem, D-14195 Berlin, Germany

[6] Kookmin Univ, Sch Adv Mat Engn, Seoul 136702, South Korea

来源：

NANOSCALE | 2012年 / 4卷 / 20期

基金：

新加坡国家研究基金会;

关键词：

HYDROQUINONE-DERIVED ADLAYERS; OXYGEN-REDUCTION; BIMETALLIC COLLOIDS; CARBON DISSOLUTION; PLATINUM-MONOLAYER; CATALYTIC-ACTIVITY; SURFACE ALLOYS; NANOPARTICLES; TRANSITION; REACTIVITY;

D O I：

10.1039/c2nr31819a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report a new method for deposition of Pt on a metal core to develop real electrocatalysts with significantly reduced amounts of expensive Pt as well as enhanced activity for oxygen reduction reaction. Ru and Pd have different crystal structures and modify the electronic structure of Pt to a different extent (shifts in d-band center). They were chosen as core materials to examine whether hydroquinone dissolved in ethanol can be used to deposit additional Pt atoms onto preformed core nanoparticles, and whether the modified d-character of Pt on different host metals can result in the enhanced ORR activity. The physicochemical characteristics of Pd-Pt and Ru-Pt core-shell nanoparticles are investigated. The core-shell structure was identified through a combination of experimental methods, employing electron microscopy, electrochemical measurements, and synchrotron X-ray measurements such as powder X-ray diffraction, X-ray absorption fine structure, and X-ray photoelectron spectroscopy. The hydroquinone reduction method proved to be an excellent route for the epitaxial growth of a Pt shell on the metal cores, leading to enhanced ORR activities.

引用

页码：6461 / 6469

页数：9

共 46 条

[1] Scaling properties of adsorption energies for hydrogen-containing molecules on transition-metal surfaces [J].