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Phase diagrams guide synthesis of highly ordered intermetallic electrocatalysts: separating alloying and ordering stages

Author

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  • Wei-Jie Zeng

    (University of Science and Technology of China)

  • Chang Wang

    (Chinese Academy of Sciences)

  • Qiang-Qiang Yan

    (University of Science and Technology of China)

  • Peng Yin

    (University of Science and Technology of China)

  • Lei Tong

    (University of Science and Technology of China)

  • Hai-Wei Liang

    (University of Science and Technology of China)

Abstract

Supported platinum intermetallic compound catalysts have attracted considerable attention owing to their remarkable activities and durability for the oxygen reduction reaction in proton-exchange membrane fuel cells. However, the synthesis of highly ordered intermetallic compound catalysts remains a challenge owing to the limited understanding of their formation mechanism under high-temperature conditions. In this study, we perform in-situ high-temperature X-ray diffraction studies to investigate the structural evolution in the impregnation synthesis of carbon-supported intermetallic catalysts. We identify the phase-transition-temperature (TPT)-dependent evolution process that involve concurrent (for alloys with high TPT) or separate (for alloys with low TPT) alloying/ordering stages. Accordingly, we realize the synthesis of highly ordered intermetallic catalysts by adopting a separate annealing protocol with a high-temperature alloying stage and a low-temperature ordering stage, which display a high mass activity of 0.96 A mgPt–1 at 0.9 V in H2–O2 fuel cells and a remarkable durability.

Suggested Citation

  • Wei-Jie Zeng & Chang Wang & Qiang-Qiang Yan & Peng Yin & Lei Tong & Hai-Wei Liang, 2022. "Phase diagrams guide synthesis of highly ordered intermetallic electrocatalysts: separating alloying and ordering stages," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-35457-1
    DOI: 10.1038/s41467-022-35457-1
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    References listed on IDEAS

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    1. Mark K. Debe, 2012. "Electrocatalyst approaches and challenges for automotive fuel cells," Nature, Nature, vol. 486(7401), pages 43-51, June.
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    Cited by:

    1. Ru-Yang Shao & Xiao-Chu Xu & Zhen-Hua Zhou & Wei-Jie Zeng & Tian-Wei Song & Peng Yin & Ang Li & Chang-Song Ma & Lei Tong & Yuan Kong & Hai-Wei Liang, 2023. "Promoting ordering degree of intermetallic fuel cell catalysts by low-melting-point metal doping," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    2. Xiao Han & Yanan Zhou & Xiaolin Tai & Geng Wu & Cai Chen & Xun Hong & Lei Tong & Fangfang Xu & Hai-Wei Liang & Yue Lin, 2024. "In-situ atomic tracking of intermetallic compound formation during thermal annealing," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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