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

Authors
Jeon, Tae-YeolPinna, NicolaYoo, Sung JongAhn, DocheonChoi, Sun HeeWillinger, Marc-GeorgCho, Yong-HunLee, Kug-SeungPark, Hee-YoungYu, Seung-HoSung, Yung-Eun
Issue Date
2012-10
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.4, no.20, pp.6461 - 6469
Abstract
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.
Keywords
HYDROQUINONE-DERIVED ADLAYERS; OXYGEN-REDUCTION; BIMETALLIC COLLOIDS; CARBON DISSOLUTION; PLATINUM-MONOLAYER; CATALYTIC-ACTIVITY; SURFACE ALLOYS; NANOPARTICLES; TRANSITION; REACTIVITY; HYDROQUINONE-DERIVED ADLAYERS; OXYGEN-REDUCTION; BIMETALLIC COLLOIDS; CARBON DISSOLUTION; PLATINUM-MONOLAYER; CATALYTIC-ACTIVITY; SURFACE ALLOYS; NANOPARTICLES; TRANSITION; REACTIVITY; fuel cell; core-shell; electrocatalysts
ISSN
2040-3364
URI
https://pubs.kist.re.kr/handle/201004/128803
DOI
10.1039/c2nr31819a
Appears in Collections:
KIST Article > 2012
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML

qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE