Pt LIII-edge EXAFS studies on Pt-Cu-Fe alloy electrocatalysts supported on carbon

D. K. Kim, J. H. Choy, K. S. Han, S. J. Hwang, W. Roh, H. Kim

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Carbon supported Pt-Cu-Fe alloys with compositions of Pt:Cu:Fe=6:1:1 and 2:1:1 have been prepared. Both catalysts exhibit higher specific activities for oxygen reduction than Pt alone. In order to reveal the local structure around Pt, we have performed X-ray absorption experiment at the Pt LIII-edge. The local structure around Pt has been analyzed by fitting the first shell including the Pt-Pt, Pt-Cu, and Pt-Fe contributions to EXAFS spectra. The fitted C.N. for both alloys are similar to that for bulk Pt, indicating that the particle size is not small. The Pt-Pt distances for both alloys are found to be slightly shorter than that of bulk Pt, and the Pt-Cu and Pt-Fe distances decrease as the amounts of Cu and Fe increase. It is therefore concluded that the catalytic activity is strongly influenced by the bonding character.

Original languageEnglish
Pages (from-to)C2-953-C2-954
JournalJournal De Physique. IV : JP
Issue number2 Part 2
Publication statusPublished - 1997

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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