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 mound 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.
|Journal||Journal De Physique. IV : JP|
|Publication status||Published - 1997 Apr|
|Event||Proceedings of the 1996 9th International Conference on X-Ray Absorption Fine Structure. Part 2 - Grenoble, Fr|
Duration: 1996 Aug 26 → 1996 Aug 30
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)