Effect of surface composition of Pt-Fe nanoparticles for oxygen reduction reactions

Title
Effect of surface composition of Pt-Fe nanoparticles for oxygen reduction reactions
Authors
정영훈정동영정남기박희영성영은유성종
Keywords
Electrocatalysts; Fuel Cell; Nanoparticle; Oleic acid; Oxygen reduction reaction; PtFe alloy
Issue Date
2014-09
Publisher
International journal of hydrogen energy
Citation
VOL 39, NO 27, 14751-14759
Abstract
The aim of this work is primarily to rationalize the effect of surface composition on electrocatalytic activity. To investigate this point, we compared two types of nanoparticles with a different surface composition, namely Fe-rich and Pt–Fe mixed surfaces. We synthesized highly dispersed carbon-supported Pt1Fex (x = 1, 2, and 3) nanoparticles with the Fe-rich surface (∼2 nm), through a preferential interaction of a capping agent and the metal, i.e., Fe-OOC. The electronic structure and electrocatalytic properties of Pt1Fex nanoparticles with the Fe-rich surface were found to be virtually independent from the Pt/Fe ratio. In contrast, nanoparticles with the Pt–Fe mixed surface, prepared by utilizing the difference of segregation energy, showed a clear dependence of the electronic and electrochemical characteristics on the amount of Pt and Fe, possibly because of the interaction between these two metals on the surface of the electrocatalysts. Compared to Pt, the Pt1Fe2 nanoparticles with the Pt–Fe mixed surface showed the highest enhancement in the activity of the oxygen reduction reaction. This resulted from the development of a more electrochemically stable structure of the Pt–Fe mixed surface. This study demonstrated that the electrocatalytic properties of the Pt–Fe nanoparticles can be tuned using the surface composition rather than the bulk composition.
URI
http://pubs.kist.re.kr/handle/201004/48053
ISSN
03603199
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