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Cited by 40Electrocatalysts for Energy ConversionCatalytic Processes in Materials ScienceCO2 Reduction Techniques and Catalysts

Lattice Contracted Ordered Intermetallic Core-Shell PtCo@Pt Nanoparticles: Synthesis, Structure and Origin for Enhanced Oxygen Reduction Reaction

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Yang, Wenhua, Zou, Liangliang, Huang, Qinghong, Zou, Zhiqing, Hu, Yemin, Yang, Hui·2017·Journal of The Electrochemical Society
DOI 10.1149/2.0851706jes
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Abstract

Electrocatalysts in ordered intermetallic phases are highly desirable for the oxygen reduction reaction (ORR) with enhanced activity and durability. Here, we develop carbon-supported ordered core-shell PtCo@Pt (O-PtCo@Pt/C with the Pt:Co atomic ratio of 1:1) intermetallic compound (IMC) nanoparticles with the metal loading as high as of 60 wt%, aiming to understand the effects of the ordered structure, metal loading and particle size on the ORR performance. The O-PtCo@Pt/C is synthesized by a two-step reduction method and followed by a heat-treatment. The mean particle diameter is about 4.8 nm with a narrow size distribution. The surface of the core-shell nanoparticles is enriched with about 3 layers of Pt atoms after the acid treatment. Noticeable lattice contraction in the O-PtCo@Pt/C has been observed by X-ray diffraction and high resolution transmission electron microscopy. Such a structurally ordered PtCo@Pt/C catalyst exhibits higher ORR activity and durability than the disordered PtCo/C and commercial Pt/C catalysts, which could be ascribed to the Pt-rich shell, ordered core structure, small particle size, lattice contraction, as well as strengthened d -hybridization. This research provides new insights to design an ordered intermetallic structure in the core and a Pt-rich surface with special facets for the excellent catalytic performance.

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Cited by

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Authors
Yang, W., Zou, L., Huang, Q., Zou, Z., Hu, Y., & Yang, H.
Affiliations
  • Shanghai University (CN)
  • Chinese Academy of Sciences (CN)
ORCID
Venue
Journal of The Electrochemical Society
Publisher
The Electrochemical Society
Published
2017
Volume
164
Issue
6
Pages
H331-H337
ISSN
  • 0013-4651 (ISSN-L)
  • 1945-7111
DOI
10.1149/2.0851706jes
OpenAlex
W2602993446
Cited by
40
References
47
Citations by year
2026: 2 · 2025: 6 · 2024: 7 · 2023: 8 · 2022: 5 · 2021: 2 · 2020: 5 · 2019: 3 · 2018: 2
FWCI
0.73
Type
journal article
Language
en
Open access
Locations
Journal of The Electrochemical Society (publishedVersion)
Funders
  • National Key RD Program of China (2016YFB0101201)
  • National High-Tech. Program (863 Program) (2015AA043503)
  • Nature Science Foundation of China (21533005, 21503262)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
  • Physical Sciences › Materials Science › Materials Chemistry › Catalytic Processes in Materials Science
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
Keywords
oxygen reduction reaction, ordered intermetallic compounds, lattice contraction, metal loading, particle size effects, d-band hybridization, acid treatment, carbon-supported electrocatalysts

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