Hydrogen Oxidation Reaction Activity of Sub-Monolayer Pt-Shell/Pd-Core Nanoparticles
| Autor: | Jong Hyun Jang, Young-Hoon Chung, Yung-Eun Sung, Sung Jong Yoo, Yong-Hun Cho, Hee-Young Park, Yoon-Hwan Cho, Namgee Jung, Kwang-Hyun Choi, Tae-Yeol Jeon, Kug-Seung Lee |
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| Rok vydání: | 2012 |
| Předmět: |
Absorption spectroscopy
Renewable Energy Sustainability and the Environment Chemistry Enthalpy Inorganic chemistry Shell (structure) Exchange current density Nanoparticle Condensed Matter Physics Electrochemistry Electrocatalyst Surfaces Coatings and Films Electronic Optical and Magnetic Materials Monolayer Materials Chemistry |
| Zdroj: | Journal of The Electrochemical Society. 160:H62-H66 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/2.058301jes |
| Popis: | The hydrogen oxidation reaction activity of sub-monolayer Pt-shell/Pd-core nanoparticles was investigated at a Pt surface concen-trationof0∼5.7%.Thenanoparticleswerepreparedusingacolloidalapproach.Thecombinationofelectrochemicalmeasurementsandhighresolution-X-rayphotoelectronspectroscopyrevealedasignificantdecreaseinoxidizedPdatoms(23.4%)withaPtsurfaceconcentration of 1.7% compared with that of Pd/C. X-ray absorption spectroscopy of the Pt LIII edge suggested preferred Pt deposi-tion, which led to more oxidized Pt atoms during Pt shell growth. The exchange current density of the hydrogen oxidation reactionon the electrocatalyst with a Pt surface concentration of 4.9% was 3.5 times higher than that on Pd/C and was comparable with thaton Pt surfaces. The changes in hydrogen oxidation reaction apparent enthalpy due to Pt shell growth suggested a rate determiningstep (RDS) change (Volmer reaction →Tafel reaction) at a Pt surface concentration of 1.7%.© 2012 The Electrochemical Society. [DOI: 10.1149/2.058301jes] All rights reserved.Manuscript submitted July 31, 2012; revised manuscript received October 24, 2012. Published November 7, 2012. |
| Databáze: | OpenAIRE |
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