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

Title
Selective deposition of Pt onto supported metal clusters for fuel cell electrocatalysts
Authors
전태열Nicola Pinna유성종안도천최선희Marc Georg Willinger조용훈이국승박희영유승호성영은
Keywords
fuel cell; core-shell; electrocatalysts
Issue Date
2012-10
Publisher
Nanoscale
Citation
VOL 4, NO 20, 6461-6469
Abstract
We report a new method for depositing 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 at 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 coreshell structure was identified through a combination of experimental methods, employing electron microscopy, electrochemical, and synchrotron X-ray measurements such as powder X-ray diffraction, Xray 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 onto the metal cores, leading to enhanced ORR activities.
URI
http://pubs.kist.re.kr/handle/201004/42972
ISSN
20403364
Appears in Collections:
KIST Publication > Article
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