Stabilized Nanoporous Metals by Dealloying Ternary Alloy Precursors

Authors

  • Josh Snyder,

    1. Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218 (USA)
    2. Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218 (USA)
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  • Piyapong Asanithi,

    1. Department of Physics and the Surrey Materials Institute, University of Surrey, Guildford, Surrey GU2 7XH (UK)
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  • Alan B. Dalton,

    1. Department of Physics and the Surrey Materials Institute, University of Surrey, Guildford, Surrey GU2 7XH (UK)
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  • Jonah Erlebacher

    Corresponding author
    1. Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218 (USA)
    2. Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218 (USA)
    • Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218 (USA).
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  • We gratefully acknowledge support for this work by the US Department of Energy, Office of Basic Energy Sciences under grant DE-FG02-05ER15727. We also are grateful to Lorenzo Manetti (Manetti Gold Leaf, Florence, Italy) for help in fabrication of AgAuPt alloy leaf.

Abstract

original image

A small percentage of platinum added to silver/gold alloys that are then electrochemically dealloyed yields an extremely high surface area nanoporous metal, with pore size less than 4 nm, as shown in the figure (scale bar = 5 nm). The presence of surface platinum stabilizes the nanostructure to coarsening in air and electrolyte.

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