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Electrochemical determination of ferrocene diffusion coefficient in liquid media under high CO2 pressure: Application to DMF–CO2 mixtures

Chanfreau, Sébastien and Cognet, Patrick and Camy, Séverine and Condoret, Jean-Stéphane Electrochemical determination of ferrocene diffusion coefficient in liquid media under high CO2 pressure: Application to DMF–CO2 mixtures. (2007) Journal of Electroanalytical Chemistry, vol. 6 (n° 1). pp. 33-40. ISSN 0022-0728

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Official URL: http://dx.doi.org/10.1016/j.jelechem.2007.02.026

Abstract

Electrochemical method can be useful for the determination of diffusion coefficients in various media. For low polarity media, ultramicroelectrodes are preferably used. In this work, the electro-oxidation of ferrocene has been studied in dimethylformamide (DMF)–CO2 mixtures under various CO2 pressures, using a 100 lm diameter Pt microelectrode. Tetrabutylammonium perchlorate (TBAP) was chosen as the supporting electrolyte. Cyclic voltammetry was used in order to obtain values of diffusion coefficient of ferrocene, which were determined by using the Randles–Sevcik relation. This method proved to be convenient in such low polarity solvent. In addition, fluid phase equilibria of CO2–DMF mixtures were calculated and pressure–composition phases diagrams were established for the concerned binary mixtures, thanks to commercial Prophy PlusTM software (Prosim S.A., France). So, both liquid phase expansion, due to swelling by high-pressure CO2 and effective bulk concentration of ferrocene were estimated. Nevertheless, electrochemical measurements were problematic when high-pressure single phase conditions of CO2–DMF mixtures were reached.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of Electroanalytical Chemistry website : http://www.sciencedirect.com/science/journal/00220728
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Réaction, mélange & séparation (RMS)
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Deposited By: Hélène Dubernard
Deposited On:05 Nov 2008 09:08

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