Hi Qiang,

There are many papers analyzing Pt SACs on ceria and many of them are able to provide good evidence of Pt-O-Ce coordination. See for example Fig. 5d in this paper and the discussion of the model and fit results.

M. Kottwitz, Y. Li, R. M. Palomino, Z. Liu, Q. Wu, G. Wang, J. Huang, J. Timoshenko, S. D. Senanayake, M. Balasubramanian, D. Lu, R. G. Nuzzo, A. I. Frenkel
Local structure and electronic state of atomically dispersed Pt on nanosized CeO2 support
ACS Catalysis 9, 8738-8748 (2019)

Regards,
Anatoly
********
On sabbatical leave at PSI, Switzerland.
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Anatoly I. Frenkel
Professor
Department of Materials Science and Chemical Engineering (primary appointment)
Department of Chemistry (affiliate appointment)
Stony Brook University
Stony Brook, NY 11794
Email:  anatoly.frenkel@stonybrook.edu
Co-Director and Spokesperson, Synchrotron Catalysis Consortium (SCC) at BNL
http://you.stonybrook.edu/scc2

Joint Appointment:
Senior Chemist
Chemistry Division, Brookhaven National Laboratory
Upton, NY 11973
Email: frenkel@bnl.gov
https://www.bnl.gov/staff/frenkel
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On Thu, Feb 8, 2024 at 2:08 PM Qiang <woschangqiang@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

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