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Issue 20, 2012
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Selective deposition of Pt onto supported metal clusters for fuel cell electrocatalysts

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Abstract

We report a new method for deposition of Pt on a metal core to develop real electrocatalysts with significantly reduced amounts of expensive Pt as well as enhanced activity for oxygen reduction reaction. Ru and Pd have different crystal structures and modify the electronic structure of Pt to a different extent (shifts in d-band center). They were chosen as core materials to examine whether hydroquinone dissolved in ethanol can be used to deposit additional Pt atoms onto preformed core nanoparticles, and whether the modified d-character of Pt on different host metals can result in the enhanced ORR activity. The physicochemical characteristics of Pd–Pt and Ru–Pt core–shell nanoparticles are investigated. The core–shell structure was identified through a combination of experimental methods, employing electron microscopy, electrochemical measurements, and synchrotron X-ray measurements such as powder X-ray diffraction, X-ray absorption fine structure, and X-ray photoelectron spectroscopy. The hydroquinone reduction method proved to be an excellent route for the epitaxial growth of a Pt shell on the metal cores, leading to enhanced ORR activities.

Graphical abstract: Selective deposition of Pt onto supported metal clusters for fuel cell electrocatalysts

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Publication details

The article was received on 12 Jul 2012, accepted on 15 Aug 2012 and first published on 17 Aug 2012


Article type: Paper
DOI: 10.1039/C2NR31819A
Citation: Nanoscale, 2012,4, 6461-6469
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    Selective deposition of Pt onto supported metal clusters for fuel cell electrocatalysts

    T. Jeon, N. Pinna, S. J. Yoo, D. Ahn, S. H. Choi, M. Willinger, Y. Cho, K. Lee, H. Park, S. Yu and Y. Sung, Nanoscale, 2012, 4, 6461
    DOI: 10.1039/C2NR31819A

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