Abstract
Defect sites on the oxide supports can be used to anchor and activate "single-atom"catalysts (SACs). By engineering the anchoring sites for supporting SACs, one can alter their electronic and atomic structures which, in turn, define their activity, selectivity, and stability for catalytic reactions. To create and tune unique sites for Pt SACs on CeO2 support, in this work, we synthesized a system consisting of CeO2 decorated on TiO2 nano-oxides for supporting the Pt SACs and investigated the effect of Pt weight loading. A combination of multiple structural characterization methods including diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), X-ray photoelectron spectroscopy (XPS), and X-ray absorption spectroscopy (XAS) was employed to characterize the distribution of charge states of single atoms and evaluate the heterogeneity of their binding sites. We have found that the placement of Pt atoms can be tuned on a mixed oxide surface by changing the weight loading of Pt.
| Original language | English |
|---|---|
| Pages (from-to) | 16187-16193 |
| Number of pages | 7 |
| Journal | Journal of Physical Chemistry C |
| Volume | 126 |
| Issue number | 38 |
| DOIs | |
| State | Published - Sep 29 2022 |
Funding
A.I.F. and H.W. acknowledge support of the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences (U.S. DOE BES), Grant DE-SC0022199. DRIFTS measurements at Brookhaven National Laboratory were made possible due to the Program Development fund 22-013 to A.I.F. Work by S.D.S. and N.R. at Brookhaven National Laboratory was supported by the U.S. DOE BES under Contract DE-SC0012704. Y.L.’s effort at ORNL was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division, Catalysis Science program. S.D.S. was partially supported by a U.S. DOE Early Career Award. This research used beamline 7-BM (QAS) of the National Synchrotron Light Source II, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract DE-SC0012704. Beamline operations were supported in part by the Synchrotron Catalysis Consortium (U.S. DOE, Office of Basic Energy Sciences, Grant DE-SC0012335). This research used a Hitachi2700C STEM of the Center for Functional Nanomaterials, which is a U.S. DOE Office of Science Facility, at Brookhaven National Laboratory under Contract DE-SC0012704. We thank Drs. S. Ehrlich, L. Ma, and N. Marinkovic for help with the beamline measurements at the QAS beamline.