Investigation of trimethylacetic acid adsorption on stoichiometric and oxygen-deficient CeO<sub>2</sub> (111) surfaces [electronic resource]
Inorganic And Physical Chemistry.
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| Online Access: |
Online Access (via OSTI) |
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| Corporate Author: | |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy. ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2016.
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| Subjects: |
| Summary: | Inorganic And Physical Chemistry. |
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| Abstract: | We studied the interactions between the carboxylate anchoring group from trimethylacetic acid (TMAA) and CeO<sub>2</sub>(111) surfaces as a function of oxygen stoichiometry using in situ X-ray photoelectron spectroscopy (XPS). The stoichiometric CeO<sub>2</sub>(111) surface was obtained by annealing the thin film under 2.0 × 10<sup>–5</sup> Torr of oxygen at ̃550 °C for 30 min. In order to reduce the CeO<sub>2</sub>(111) surface, the thin film was annealed under ̃5.0 × 10<sup>–10</sup> Torr vacuum conditions at 550 °C, 650 °C, 750 °C and 850 °C for 30 min to progressively increase the oxygen defect concentration on the surface. The saturated TMAA coverage on the CeO<sub>2</sub>(111) surface determined from XPS elemental composition is found to increase with increasing oxygen defect concentration. This is attributed to the increase of under-coordinated cerium sites on the surface with the increase in the oxygen defect concentrations. Furthermore, XPS results were in agreement with periodic density functional theory (DFT) calculations and indicate a stronger binding between the carboxylate group from TMAA and the oxygen deficient CeO<sub>2–δ</sub>(111) surface through dissociative adsorption. |
| Item Description: | Published through SciTech Connect. 05/12/2016. "la-ur--16-20620" Physical Chemistry Chemical Physics. PCCP (Print) 18 23 ISSN 1463-9076; PPCPFQ AM. Shail Sanghavi; Weina Wang; Manjula I. Nandasiri; Ajay S. Karakoti; Wenliang Wang; Ping Yang; S. Thevuthasan. |
| Physical Description: | p. 15625-15631 : digital, PDF file. |