Abstract
During redox reactions, oxide-supported catalytic systems undergo structural and chemical changes. Improving subsequent catalytic properties requires an understanding of the atomic-scale structure with chemical state specificity under reaction conditions. For the case of 1/2 monolayer vanadia on α-TiO2(110), we use X-ray standing wave (XSW) excited X-ray photoelectron spectroscopy to follow the redox induced atomic positional and chemical state changes of this interface. While the resulting XSW 3D composite atomic maps include the Ti and O substrate atoms and V surface atoms, our focus in this report is on the previously unseen surface oxygen species with comparison to density functional theory predictions.
Original language | English (US) |
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Pages (from-to) | 17937-17941 |
Number of pages | 5 |
Journal | Journal of the American Chemical Society |
Volume | 143 |
Issue number | 43 |
DOIs | |
State | Published - Nov 3 2021 |
Funding
This research was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, ICEP program, under Award DE-FG02-03ER15457. This work made use of the Keck-II facility and SPID facility of Northwestern University’s NUANCE Center, which has received support from the SHyNE Resource (NSF ECCS-2025633), IIN, and Northwestern’s MRSEC program (NSF DMR-1720139). This BRXSW-XPS work used Diamond Light Source (DLS) beamline I09 (DLS proposal number SI15748). The XRF V coverage measurement used DND-CAT at the Advanced Photon Source (APS). The ALD and use of the APS at Argonne National Lab are funded by DOE (DE-AC02-06CH11357). DFT work (H.P. and P.Z.) is supported by Laboratory Directed Research and Development (LDRD) funding from Argonne National Laboratory, provided by the Director, Office of Science, of the U.S. Department of Energy under Contract DE-AC02-06CH11357. We thank David McCue (DLS), Dr. Pardeep Thakur (DLS), and Dr. David Duncan (DLS) for assistance with our beamtime at DLS. We thank Dr. Anil Mane (ANL) for his help with ALD growth.
ASJC Scopus subject areas
- Catalysis
- General Chemistry
- Biochemistry
- Colloid and Surface Chemistry