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Title: | Control and enhancement of the oxygen storage capacity of ceria films by variation of the deposition gas atmosphere during pulsed DC magnetron sputtering |
Author: | Eltayeb, Asmaa Vijayaraghavan, Rajani K McCoy, Anthony Venkatanarayanan, Anita Yaremchenko, Aleksey A Surendran, Rajesh McGlynn, Enda Daniels, Stephen |
Keywords: | CeO2 Oxygen storage capacity Magnetron sputtering Thin films Cyclic voltammetry TGA |
Issue Date: | 2015 |
Publisher: | Elsevier |
Abstract: | In this study, nanostructured ceria (CeO2) films are deposited on Si(100) and ITO coated glass substrates by pulsed DC magnetron sputtering using a CeO2 target. The influence on the films of using various gas ambients, such as a high purity Ar and a gas mixture of high purity Ar and O2, in the sputtering chamber during deposition are studied. The film compositions are studied using XPS and SIMS. These spectra show a phase transition from cubic CeO2 to hexagonal Ce2O3 due to the sputtering process. This is related to the transformation of Ce4þ to Ce3þ and indicates a chemically reduced state of CeO2 due to the for mation of oxygen vacancies. TGA and electrochemical cyclic voltammetry (CV) studies show that films deposited in an Ar atmosphere have a higher oxygen storage capacity (OSC) compared to films deposited in the presence of O2. CV results specifically show a linear variation with scan rate of the anodic peak currents for both films and the double layer capacitance values for films deposited in Ar/O2 mixed and Ar atmosphere are (1.6 ± 0.2) 10 4 F and (4.3 ± 0.5) 10 4 F, respectively. Also, TGA data shows that Ar sputtered samples have a tendency to greater oxygen losses upon reduction compared to the films sputtered in an Ar/O2 mixed atmosphere. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/18185 |
DOI: | 10.1016/j.jpowsour.2014.12.146 |
ISSN: | 0378-7753 |
Appears in Collections: | CICECO - Artigos |
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