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Jeong, Hu Young
UNIST Central Research Facilities (UCRF)
Research Interests
  • Soft material characterization such as graphene using a low kV Cs-corrected TEM
  • Insitu-TEM characterization of carbon-based materials using nanofactory STM holder for Li-ion battery application
  • Structural characterization of mesoporous materials using SEM & TEM
  • Interface analysis between various oxides and metals through Cs-corrected (S)TEM
  • Resistive switching mechanism of graphene oxide thin films for RRAM application

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Intermetallic PtCu Nanoframes as Efficient Oxygen Reduction Electrocatalysts

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Title
Intermetallic PtCu Nanoframes as Efficient Oxygen Reduction Electrocatalysts
Author
Kim, Ho YoungKwon, TaehyunHa, YoonhooJun, MinkiBaik, HionsuckJeong, Hu YoungKim, HyungjunLee, KwangyeolJoo, Sang Hoon
Issue Date
2020-10
Publisher
American Chemical Society
Citation
NANO LETTERS, v.20, no.10, pp.7413 - 7421
Abstract
Nanoframe alloy structures represent a class of high-performance catalysts for the oxygen reduction reaction (ORR), owing to their high active surface area, efficient molecular accessibility, and nanoconfinement effect. However, structural and chemical instabilities of nanoframes remain an important challenge. Here, we report the synthesis of PtCu nanoframes constructed with an atomically ordered intermetallic structure (O-PtCuNF/C) showing high ORR activity, durability, and chemical stability. We rationally designed the O-PtCuNF/C catalyst by combining theoretical composition predictions with a silica-coating-mediated synthesis. The O-PtCuNF/C combines intensified strain and ligand effects from the intermetallic PtCu L11 structure and advantages of the nanoframes, resulting in superior ORR activity to disordered alloy PtCu nanoframes (D-PtCuNF/C) and commercial Pt/C catalysts. Importantly, the O-PtCuNF/C showed the highest ORR mass activity among PtCu-based catalysts. Furthermore, the O-PtCuNF/C exhibited higher ORR durability and far less etching of constituent atoms than D-PtCuNF/C and Pt/C, attesting to the chemically stable nature of the intermetallic structure. Copyright © 2020 American Chemical Society.
URI
https://scholarworks.unist.ac.kr/handle/201301/48795
URL
https://pubs.acs.org/doi/10.1021/acs.nanolett.0c02812
DOI
10.1021/acs.nanolett.0c02812
ISSN
1530-6984
Appears in Collections:
CHM_Journal Papers
UCRF_Journal Papers
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