Cited by 72Electrocatalysts for Energy ConversionCatalytic Processes in Materials ScienceFuel Cells and Related Materials

High‐Temperature Confinement Synthesis of Supported Pt–Ni Nanoparticles for Efficiently Catalyzing Oxygen Reduction Reaction

Wang, Kun, Wang, Yifan, Geng, Shipeng, Wang, Yi, Song, Shuqin·2022·Advanced Functional Materials

Abstract

Developing efficient Pt‐based alloy as oxygen reduction reaction (ORR) electrocatalysts is critical for practical applications of fuel cells. High‐temperature reduction technology can improve the alloy atoms ordering but inevitably accelerate metal sintering. Here, Pt–Ni nanoparticles (<5 nm) embedded into ordered mesoporous carbon (OMC) matrix are developed, and its confinement effect suppresses nanoparticles sintering up to 900 °C. After an elaborative dealloying process, the surface structure of Pt–Ni nanoparticles changes from a Ni‐rich to Pt‐rich layer (the thickness is about 0.15 nm). The optimized sample (PtNi3@OMC‐A) displays outstanding mass and specific activities of 2.11 A mgPt–1 and 3.23 mA cmPt–2, more than one order of magnitude higher than commercial Pt/C (20 wt%). PtNi3@OMC‐A also exhibits long‐term stability with a negligible activity loss after 10 000 potential cycles. Both experimental results and density functional theory calculations reveal that alloying effect as well as strain effect weaken Pt–O binding strength, thus resulting in an outstanding ORR activity. Furthermore, the high long‐term stability can be attributed to the confinement of OMC, inhibiting the detachment or agglomeration of the embedded alloy nanoparticles.

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Crossref · 10.1002/adfm.202113399

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Authors
Wang, K., Wang, Y., Geng, S., Wang, Y., & Song, S.
Affiliations
Sun Yat-sen University (CN)
Corresponding author
  • Wang, Yi
  • Song, Shuqin
Venue
Advanced Functional Materials
Publisher
Wiley
Published
2022-02-25
Volume
32
Issue
22
ISSN
  • 1616-301X (ISSN-L)
  • 1616-3028
OpenAlex
W4214673294
Cited by
72
References
43
Citations by year
2026: 8 · 2025: 14 · 2024: 22 · 2023: 22 · 2022: 6
FWCI
2.88
Type
journal article
Language
en
Open access
closed
Locations
Advanced Functional Materials (publishedVersion)
Funders
National Natural Science Foundation of China (21978331, 21975292, 21905311, 90261124)
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 › Engineering › Electrical and Electronic Engineering › Fuel Cells and Related Materials
Keywords
oxygen reduction reaction, electrocatalysts, ordered mesoporous carbon, confinement effects, dealloying, alloying effects, strain effects, long-term stability, fuel cells

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