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

Tae Yeol Jeon, Nicola Pinna, Sung Jong Yoo, Docheon Ahn, Sun Hee Choi, Marc Georg Willinger, Yong Hun Cho, Kug Seung Lee, Hee Young Park, Seung Ho Yu, Yung Eun Sung

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13 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)6461-6469
Number of pages9
JournalNanoscale
Volume4
Issue number20
DOIs
Publication statusPublished - 2012 Oct 21
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)

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    Jeon, T. Y., Pinna, N., Yoo, S. J., Ahn, D., Choi, S. H., Willinger, M. G., Cho, Y. H., Lee, K. S., Park, H. Y., Yu, S. H., & Sung, Y. E. (2012). Selective deposition of Pt onto supported metal clusters for fuel cell electrocatalysts. Nanoscale, 4(20), 6461-6469. https://doi.org/10.1039/c2nr31819a