New counter electrode prepared as vanadium oxide and V/Ce oxide films: preparation and characterization |
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| Institution: | 1. CSIRO Manufacturing Flagship, New Horizons, Clayton Campus, Monash University, Victoria 3800, Australia;2. Department of Mathematics, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia;3. IBM Research Australia, 204 Lygon Street, 3053 Carlton, Victoria, Australia;4. Nanoscale Science and Engineering Laboraties (NSEL), Department of Mechanical Engineering, Monash University, Clayton, Victoria 3800, Australia;5. CSIRO Group Executive, Private Bag 10, Clayton South MDC, Victoria 3169, Australia;1. Department of Physics, Faculty of Science and Literature, University of Balikesir, 10145 Cag?s, Balikesir, Turkey;2. Department of Physics, Faculty of Science and Literature, University of Uludag, 16059 Gorukle, Bursa, Turkey;1. Dipartimento di Scienze Chimiche e Geologiche, Università di Cagliari, Complesso Universitario Monserrato, s.s. 554 Bivio Sestu, 09042 Monserrato, CA, Italy;2. Dipartimento di Chimica, Università “La Sapienza”, P.le Aldo Moro 5, 00185 Roma, Italy;3. ENEA, Centro Ricerche Casaccia, Via Anguillarese 301, 00123 S. Maria di Galeria, Roma, Italy;1. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, PR China;2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan Shanxi 030001, PR China;3. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. School of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, China;2. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China;3. Key Laboratory of Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China |
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| Abstract: | Vanadium oxide and mixed V/Ce-oxide films at 78, 55, 38, 32 atomic % of V were prepared via the sol-gel route from an aqueous colloidal solution of inorganic precursors. The influence of the added cerium precursor on their electrochemical, optical and structural properties was investigated by cyclic voltammetry (CV), X-ray analysis, IR spectroscopy and UV-VIS techniques. The electrochemical stability of films was tested by CV measurements in 1 M LiClO4 in propylene carbonate electrolyte. The addition of CeO2 improved the poor stability of vanadium oxide films and enhanced their ion-charge capacity up to 30 mC/cm2 for thicknesses about 300 nm. The intercalation of Li+ ions in vanadium oxide and V/Ce-oxide films was followed by FT-IR spectroscopy performed at near-grazing incidence angle (NGIA) conditions in combination with CV measurements at potentials of ?1.5 V and +2.0 V (vs. Ag/AgCl). The observed shift of V–Ov vibrations in the IR spectra confirmed the intercalation of Li+ ions. |
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