@article{dc9812b43fc7453bb3c0fb8904d64690,
title = " Interactions of VO x Species with Amorphous TiO 2 Domains on ALD-Derived Alumina-Supported Materials ",
abstract = " Alumina-supported VO x -TiO 2 materials are synthesized by atomic layer deposition (ALD) and characterized by diffuse reflectance UV-vis (DRUV-vis) spectroscopy, Raman spectroscopy, and density functional theory (DFT) calculations in order to identify the metal oxide structures present on the surface of the support. Preferential binding of VO x to TiO 2 domains is demonstrated by Raman spectroscopy studies and confirmed by DFT. Varying distributions of V-O-Ti, V-O-V, and V-O-Al bonds are present in the examined materials. The interactions of VO x and TiO 2 are elucidated further under a reducing, H 2 environment at elevated temperatures. An enhancement in reducibility of VO x species is expected and observed upon the modification of alumina with TiO 2 above monolayer coverages, but also when a single ALD cycle of TiO 2 is deposited following the deposition of VO x on the support. X-ray photoelectron spectroscopy (XPS) detects changes in the oxidation state of vanadium, but not titanium during reduction. Reversible migration and aggregation of V and Ti atoms is also detected upon heating in H 2 .",
author = "Samek, {Izabela A.} and Bobbitt, {N. Scott} and Snurr, {Randall Q.} and Stair, {Peter C.}",
note = "Funding Information: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award Number DOE DE-FG02-03-ER154757. The Clean Catalysis Facility of the Northwestern University Center for Catalysis and Surface Science is supported by a grant from the DOE (DE-SC0001329). The CleanCat Core facility acknowledges funding from the U.S. Department of Energy (Grant DEFG02-03ER15457) used for the purchase of the Altamira AMI200. This work made use of the Keck-II facility of Northwestern University{\textquoteright}s NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205); the MRSEC program (NSF DMR-1720139) at the Materials Research Center; the International Institute for Nanotechnology (IIN); and the Keck Foundation; and the State of Illinois, through the IIN. This work made use of the J. B. Cohen X-ray Diffraction Facility supported by the MRSEC program of the National Science Foundation (Grant DMR-1121262) at the Materials Research Center of North-western University. Metal analysis was performed at the Northwestern University Quantitative Bioelement Imaging Center. I.A.S. would like to thank Dr. Keith MacRenaris and Rebecca Sponenburg for performing the metal analysis. XAS was performed at the DuPont−Northwestern−Dow Collaborative Access Team (DND-CAT) at the Advanced Photon Source at Argonne National Laboratory (DOE Contract DE-AC02-06CH11357). I.A.S. thanks Dr. Qing Ma, Dr. Scott Nauert, and Louisa Savereide for their assistance with X-ray absorption spectroscopy experiments. This research was supported in part through the computational resources and staff contributions provided for the Quest high performance computing facility at Northwestern University which is jointly supported by the Office of the Provost, the Office for Research, and Northwestern University Information Technology. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility operated under Contract DE-AC02-05CH11231. R.Q.S. gratefully acknowledges support from the Alexander von Humboldt Foundation. This work was also supported financially by 3M through a fellowship to I.A.S. I.A.S acknowledges Dr. J. Miles Tan and Dr. Xin Tang for all the helpful discussions. Funding Information: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award Number DOE DE-FG02-03-ER154757. The Clean Catalysis Facility of the Northwestern University Center for Catalysis and Surface Science is supported by a grant from the DOE (DE-SC0001329). The CleanCat Core facility acknowledges funding from the U.S. Department of Energy (Grant DEFG02-03ER15457) used for the purchase of the Altamira AMI200. This work made use of the Keck-II facility of Northwestern University's NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205); the MRSEC program (NSF DMR-1720139) at the Materials Research Center; the International Institute for Nanotechnology (IIN); and the Keck Foundation; and the State of Illinois, through the IIN. This work made use of the J. B. Cohen X-ray Diffraction Facility supported by the MRSEC program of the National Science Foundation (Grant DMR-1121262) at the Materials Research Center of Northwestern University. Metal analysis was performed at the Northwestern University Quantitative Bioelement Imaging Center. I.A.S. would like to thank Dr. Keith MacRenaris and Rebecca Sponenburg for performing the metal analysis. XAS was performed at the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT) at the Advanced Photon Source at Argonne National Laboratory (DOE Contract DE-AC02-06CH11357). I.A.S. thanks Dr. Qing Ma, Dr. Scott Nauert, and Louisa Savereide for their assistance with X-ray absorption spectroscopy experiments. This research was supported in part through the computational resources and staff contributions provided for the Quest high performance computing facility at Northwestern University which is jointly supported by the Office of the Provost the Office for Research, and Northwestern University Information Technology. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility operated under Contract DE-AC02-05CH11231. R.Q.S. gratefully acknowledges support from the Alexander von Humboldt Foundation. This work was also supported financially by 3M through a fellowship to I.A.S. I.A.S acknowledges Dr. J. Miles Tan and Dr. Xin Tang for all the helpful discussions. Publisher Copyright: Copyright {\textcopyright} 2018 American Chemical Society.",
year = "2019",
month = apr,
day = "4",
doi = "10.1021/acs.jpcc.8b07424",
language = "English (US)",
volume = "123",
pages = "7988--7999",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "13",
}