Hi Qiang: It is exactly as you say. The number of metal-metal paths is small and not well ordered. This washes out the scattering significantly. If the Pt is in a more rigid well-ordered structure the second "shell" path is generally more visible.
Carlo On Thu, Feb 8, 2024 at 1:08 PM Qiang <woschangqi...@126.com> wrote: > Hi everyone, > > I would like to have a discussion about the common EXAFS for single atom > catalysts. It is usually observed that there is only one strong peak around > 1.5A in EXAFS, and it is attributed to the nearest neighbors of O or N. > Take an example of Pt1/CeO2 catalyst. Pt single atom is coordinated with a > few oxygens, i.e., PtOx. These oxygens constitute the first shell of Pt. It > is supposed that these O should also attach to the metal element of the > support (Ce here). So there is also Pt-O-Ce structure. Why it doesnot have > strong scattering peak in EXAFS? Is it that because the Pt-O-Ce formed is > not ordered, or it is actually not a bond just some weak contact? > > Thank you very much. > > Qiang > > _______________________________________________ > Ifeffit mailing list > Ifeffit@millenia.cars.aps.anl.gov > http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit > Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit > -- Carlo U. Segre (he/him) -- Duchossois Leadership Professor of Physics Professor of Materials Science & Engineering Director, Center for Synchrotron Radiation Research and Instrumentation Illinois Institute of Technology Phone: 312.567.3498 se...@iit.edu http://phys.iit.edu/~segre se...@debian.org
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