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Song, Hyun-Kon
eclat: ElectroChemistry Lab of Advanced Technology
Research Interests
  • Electrochemical analysis, electroactive materials, electrochemistry-based energy devices

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Sphere-to-Multipod Transmorphic Change of Nanoconfined Pt Electrocatalyst during Oxygen Reduction Reaction

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Title
Sphere-to-Multipod Transmorphic Change of Nanoconfined Pt Electrocatalyst during Oxygen Reduction Reaction
Author
Yang, JuchanKang, DongwooJeon, YujuLee, Jong HoonJeong, Hu YoungShin, Hyeon SukSong, Hyun-Kon
Issue Date
2019-01
Publisher
WILEY-V C H VERLAG GMBH
Citation
SMALL, v.15, no.2, pp.1802228
Abstract
An oxygen reduction reaction (ORR) catalyst/support system is designed to have Pt nanoparticles nanoconfined in a nanodimensionally limited space. Holey crumpled reduced graphene oxide plates (hCR-rGO) are used as a carbon support for Pt loading. As expected from interparticular Pt-to-Pt distance of Pt-loaded hCR-rGO longer than that of Pt/C (Pt-loaded carbon black as a practical Pt catalyst), the durability of ORR electroactivity along cycles is improved by replacing the widely used carbon black with hCR-rGO. Unexpected morphological changes of Pt are electrochemically induced during repeated ORR processes. Spherical multifaceted Pt particles are evolved to {110}-dominant dendritic multipods. Nanoconfinement of a limited number of Pt within a nanodimensionally limited space is responsible for the morphological changes. The improved durability observed from Pt-loaded hCR-rGO originates from 1) dendritic pod structure of Pt exposing more active sites to reactants and 2) highly ORR-active Pt {110} planes dominant on the surface.
URI
https://scholarworks.unist.ac.kr/handle/201301/25489
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/smll.201802228
DOI
10.1002/smll.201802228
ISSN
1613-6810
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