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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

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.

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    Title
    • Palladium-Platinum Core-Shell Icosahedra With Substantially Enhanced Activity and Durability Towards Oxygen Reduction
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    Date Created
    2015-07-01
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    Identifier
    • Digital object identifier: 10.1038/ncomms8594
    • Identifier Type
      International standard serial number
      Identifier Value
      2041-1723
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    • The final version of this article, as published in NATURE COMMUNICATIONS, can be viewed online at: http://dx.doi.org/10.1038/ncomms8594

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    Wang, Xue, Choi, Sang-Il, Roling, Luke T., Luo, Ming, Ma, Cheng, Zhang, Lei, Chi, Miaofang, Liu, Jingyue, Xie, Zhaoxiong, Herron, Jeffrey A., Mavrikakis, Manos, & Xia, Younan (2015). Palladium-platinum core-shell icosahedra with substantially enhanced activity and durability towards oxygen reduction. NATURE COMMUNICATIONS, 6. http://dx.doi.org/10.1038/ncomms8594

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