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Oxygen Storage in Transition Metal-Doped Bixbyite Vanadium Sesquioxide Nanocrystals

preprint
submitted on 18.06.2020 and posted on 22.06.2020 by Lauren Reimnitz, Thiri Lwin, Mario Lopez, Delia Milliron

Bixbyite vanadium sesquioxide (V2O3) is a metastable polymorph of vanadium oxide that has been shown to have a significant oxygen storage capacity with very low temperature oxidation onset. In this work, bixbyite V2O3 nanocrystals were synthesized with titanium and manganese dopants. Doped materials with varied dopant concentration were synthesized, and all were incorporated as aliovalent metal ions. The oxygen storage capacity of these nanocrystal materials was evaluated over ten oxidation and reduction cycles. It was found that over these ten cycles, the oxygen storage capacity of all the materials fell drastically. In situ X-ray diffraction evidence shows that manganese-doped materials degrade into an amorphous manganese-containing vanadate, while titanium-doped materials form crystalline degradation products. In all cases, this degradation causes an increase in the minimum mass achieved during oxygen release, indicating irreversible oxidation.

Funding

University of Texas Energy Institute UTA17-000951

National Science Foudation CHE-1559839

Welch Foundation F-1848

History

Email Address of Submitting Author

LaurenReimnitz@utexas.edu

Institution

University of Texas at Austin

Country

United States

ORCID For Submitting Author

0000-0003-4570-7176

Declaration of Conflict of Interest

no conflict of interest

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