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Intermetallic PtCu Nanoframes as Efficient Oxygen Reduction Electrocatalysts

Authors
Kim, Ho YoungKwon, TaehyunHa, YoonhooJun, MinkiBaik, HionsuckJeong, Hu YoungKim, HyungjunLee, KwangyeolJoo, Sang Hoon
Issue Date
14-10월-2020
Publisher
AMER CHEMICAL SOC
Keywords
nanoframe; intermetallic; oxygen reduction reaction; electrocatalyst
Citation
NANO LETTERS, v.20, no.10, pp.7413 - 7421
Indexed
SCIE
SCOPUS
Journal Title
NANO LETTERS
Volume
20
Number
10
Start Page
7413
End Page
7421
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/52457
DOI
10.1021/acs.nanolett.0c02812
ISSN
1530-6984
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 silicacoating-mediated synthesis. The O-PtCuNF/C combines intensified strain and ligand effects from the intermetallic PtCu L1(1) 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.
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