Electrochemical redox reaction in a silica sol-gel glass with embedded organic electrolyte |
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| Affiliation: | 1. Department of Chemistry, Thiagarajar College, Madurai, Tamilnadu 625 009, India;2. Department of Chemistry, Sethu Institute of Technology, Virudhunagar, Tamilnadu 626 115, India;3. Department of Industrial Chemistry, Alagappa University, Karaikudi, Tamilnadu 630 003. India;1. Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;2. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, Slovakia;3. AGH University of Science and Technology, Krakow, Poland;4. Materials Research Institute, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom;5. Department of Energy, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy |
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| Abstract: | The electrochemical redox reaction of ferrocene was studied in silica sol-gel glass with embedded organic electrolyte. This material has been prepared by mixing hydrolysed tetramethylorthosilicate sol with propylene carbonate LiClO4 solution containing ferrocene and further gelation in a form of block or film. The electrochemical behaviour of encapsulated ferrocene was studied by cyclic voltammetry, chronoamperometry, differential pulse voltammetry and impedance spectroscopy on ultramicroelectrodes. The shape of the cyclic voltammograms corresponding to the electrooxidation of ferrocene in sol-gel block is similar to that obtained in liquid electrolyte and it does not depend on gel aging. The current substantially decreases during the first few days after gelation. Later it becomes weakly dependent on aging and the apparent diffusion coefficient of ferrocene in the gel block is about half of that in liquid electrolyte. The electrooxidation of ferrocene also occurs in film of the analogous sol-gel material cast on the surface of the electrode assembly. |
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