resumo
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 O-2, 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 Ce4+ to Ce3+ and indicates a chemically reduced state of CeO2 due to the formation 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 O-2. 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/O-2 mixed and Ar atmosphere are (1.6 +/- 0.2) x 10(-4) F and (4.3 +/- 0.5) x 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/O-2 mixed atmosphere. (C) 2015 Elsevier B.V. All rights reserved.
palavras-chave
OXIDE THIN-FILMS; CHARGE STORAGE; ELECTROCATALYTIC ACTIVITY; MIXED OXIDES; CEO2; GROWTH; SPECTROSCOPY; CONDUCTIVITY; STABILITY; CATALYSTS
categoria
Chemistry; Electrochemistry; Energy & Fuels; Materials Science
autores
Eltayeb, A; Vijayaraghavan, RK; McCoy, A; Venkatanarayanan, A; Yaremchenko, AA; Surendran, R; McGlynn, E; Daniels, S
nossos autores
Aleksey Yaremchenko
Investigador Principal
Rajesh Surendran Nair
Bolseiro de pós-Doutoramentoagradecimentos
A. Eltayeb, S. Daniels and E. McGlynn specifically gratefully acknowledge postgraduate funding from INSPIRE, supported under the framework of the Irish government's PRTLI cycle 5, national development plan 2007-2013 with the assistance of the European regional development fund. S. Daniels and K.V. Rajani also gratefully acknowledge SFI's Strategic Research Cluster Programme (