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Title: Interactions of VO x Species with Amorphous TiO 2 Domains on ALD-Derived Alumina-Supported Materials

Abstract

Alumina-supported VOx–TiO2 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 VOx to TiO2 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 VOx and TiO2 are elucidated further under a reducing, H2 environment at elevated temperatures. An enhancement in reducibility of VOx species is expected and observed upon the modification of alumina with TiO2 above monolayer coverages, but also when a single ALD cycle of TiO2 is deposited following the deposition of VOx 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 H2.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2]
  1. Northwestern Univ., Evanston, IL (United States). Dept. of Chemical and Biological Engineering
  2. Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1542922
DOE Contract Number:  
FG02-03-ER154757; SC0001329; AC02- 06CH11357; AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 123; Journal Issue: 13; Journal ID: ISSN 1932-7447
Country of Publication:
United States
Language:
English

Citation Formats

Samek, Izabela A., Bobbitt, N. Scott, Snurr, Randall Q., and Stair, Peter C. Interactions of VO x Species with Amorphous TiO 2 Domains on ALD-Derived Alumina-Supported Materials. United States: N. p., 2018. Web. doi:10.1021/acs.jpcc.8b07424.
Samek, Izabela A., Bobbitt, N. Scott, Snurr, Randall Q., & Stair, Peter C. Interactions of VO x Species with Amorphous TiO 2 Domains on ALD-Derived Alumina-Supported Materials. United States. doi:10.1021/acs.jpcc.8b07424.
Samek, Izabela A., Bobbitt, N. Scott, Snurr, Randall Q., and Stair, Peter C. Fri . "Interactions of VO x Species with Amorphous TiO 2 Domains on ALD-Derived Alumina-Supported Materials". United States. doi:10.1021/acs.jpcc.8b07424.
@article{osti_1542922,
title = {Interactions of VO x Species with Amorphous TiO 2 Domains on ALD-Derived Alumina-Supported Materials},
author = {Samek, Izabela A. and Bobbitt, N. Scott and Snurr, Randall Q. and Stair, Peter C.},
abstractNote = {Alumina-supported VOx–TiO2 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 VOx to TiO2 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 VOx and TiO2 are elucidated further under a reducing, H2 environment at elevated temperatures. An enhancement in reducibility of VOx species is expected and observed upon the modification of alumina with TiO2 above monolayer coverages, but also when a single ALD cycle of TiO2 is deposited following the deposition of VOx 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 H2.},
doi = {10.1021/acs.jpcc.8b07424},
journal = {Journal of Physical Chemistry. C},
issn = {1932-7447},
number = 13,
volume = 123,
place = {United States},
year = {2018},
month = {9}
}