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Origin of the enhanced electrocatalysis for thermally controlled nanostructure of bimetallic nanoparticles

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Title
Origin of the enhanced electrocatalysis for thermally controlled nanostructure of bimetallic nanoparticles
Author(s)
Chung Y.-H.; Dong Young Chung; Jung N.; Park H.Y.; Yoo S.J.; Jang J.H.; Yung Eun Sung
Publication Date
2014-05
Journal
JOURNAL OF PHYSICAL CHEMISTRY C, v.118, no.19, pp.9939 - 9945
Publisher
AMER CHEMICAL SOC
Abstract
The thermal annealing process is a common treatment used after the preparation step to enhance the electrocatalytic properties of the oxygen reduction reaction (ORR). The structure of a Pt-based bimetallic nanoparticle, which is significantly affected by the catalytic properties, is reconstructed by thermal energy. We investigated the effect of structural reconstruction induced by thermal annealing on the improvement of the ORR using various physical and electrochemical methods. We found that the structural evolution of PtNi nanoparticles, i.e., the Pt-Ni ordering with the Pt shell and the surface reorientation into the (111) facet, is the source of the enhanced ORR activity as well as electrochemical stability through the thermal annealing. This result confirms the crucial factors for the ORR properties by the thermal annealing process and proposes a way to design advanced electrocatalysts. © 2014 American Chemical Society.
URI
https://pr.ibs.re.kr/handle/8788114/1042
ISSN
1932-7447
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
Files in This Item:
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