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

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Title
Effect of surface composition of Pt-Fe nanoparticles for oxygen reduction reactions
Author(s)
Chung Y.-H.; Dong Young Chung; Jung N.; Park H.-Y.; Yung Eun Sung; Yoo S.J.
Publication Date
2014-09
Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.39, no.27, pp.14751 - 14759
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
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 PteFe mixed surfaces. We synthesized highly dispersed carbon-supported Pt1Fex (x ¼ 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 PteFe 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 PteFe 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 PteFe mixed surface. This study demonstrated that the electrocatalytic properties of the PteFe nanoparticles can be tuned using the surface composition rather than the bulk composition.
URI
https://pr.ibs.re.kr/handle/8788114/916
ISSN
0360-3199
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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