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Palladium–platinum core-shell icosahedra with substantially enhanced activity and durability towards oxygen reduction

Author

Listed:
  • Xue Wang

    (Georgia Institute of Technology and Emory University
    State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University
    Xiamen University)

  • Sang-Il Choi

    (Georgia Institute of Technology and Emory University)

  • Luke T. Roling

    (University of Wisconsin-Madison)

  • Ming Luo

    (Georgia Institute of Technology and Emory University)

  • Cheng Ma

    (Center for Nanophase Materials Sciences, Oak Ridge National Laboratory)

  • Lei Zhang

    (Georgia Institute of Technology and Emory University
    State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University
    Xiamen University)

  • Miaofang Chi

    (Center for Nanophase Materials Sciences, Oak Ridge National Laboratory)

  • Jingyue Liu

    (Arizona State University)

  • Zhaoxiong Xie

    (State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University
    Xiamen University)

  • Jeffrey A. Herron

    (University of Wisconsin-Madison)

  • Manos Mavrikakis

    (University of Wisconsin-Madison)

  • Younan Xia

    (Georgia Institute of Technology and Emory University
    School of Chemistry and Biochemistry, Georgia Institute of Technology
    School of Chemical and Biomolecular Engineering, Georgia Institute of Technology)

Abstract

Conformal deposition of platinum as ultrathin shells on facet-controlled palladium nanocrystals offers a great opportunity to enhance the catalytic performance while reducing its loading. Here we report such a system based on palladium icosahedra. Owing to lateral confinement imposed by twin boundaries and thus vertical relaxation only, the platinum overlayers evolve into a corrugated structure under compressive strain. For the core-shell nanocrystals with an average of 2.7 platinum overlayers, their specific and platinum mass activities towards oxygen reduction are enhanced by eight- and sevenfold, respectively, relative to a commercial catalyst. Density functional theory calculations indicate that the enhancement can be attributed to the weakened binding of hydroxyl to the compressed platinum surface supported on palladium. After 10,000 testing cycles, the mass activity of the core-shell nanocrystals is still four times higher than the commercial catalyst. These results demonstrate an effective approach to the development of electrocatalysts with greatly enhanced activity and durability.

Suggested Citation

  • Xue Wang & Sang-Il Choi & Luke T. Roling & Ming Luo & Cheng Ma & Lei Zhang & Miaofang Chi & Jingyue Liu & Zhaoxiong Xie & Jeffrey A. Herron & Manos Mavrikakis & Younan Xia, 2015. "Palladium–platinum core-shell icosahedra with substantially enhanced activity and durability towards oxygen reduction," Nature Communications, Nature, vol. 6(1), pages 1-8, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8594
    DOI: 10.1038/ncomms8594
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    Cited by:

    1. Kai Liu & Hao Yang & Yilan Jiang & Zhaojun Liu & Shumeng Zhang & Zhixue Zhang & Zhun Qiao & Yiming Lu & Tao Cheng & Osamu Terasaki & Qing Zhang & Chuanbo Gao, 2023. "Coherent hexagonal platinum skin on nickel nanocrystals for enhanced hydrogen evolution activity," Nature Communications, Nature, vol. 14(1), pages 1-12, December.

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