Modeling of mass and charge transfer in an inverted rotating disk electrode (IRDE) reactor |
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Authors: | Heidi Van Parys, Els Tourw , Tom Breugelmans, Marnix Depauw, Johan Deconinck,Annick Hubin |
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Affiliation: | aVrije Universiteit Brussel, Department of Metallurgy, Electrochemistry and Materials Science, Pleinlaan 2, 1050 Brussels, Belgium;bVrije Universiteit Brussel, Computational Electrochemistry Group, Department of Electrical Engineering and Power Electronics, Pleinlaan 2, 1050 Brussels, Belgium;cHogeschool Antwerpen, Department of Industrial Sciences and Technology – Chemistry, Paardenmarkt 92, 2000 Antwerp, Belgium |
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Abstract: | In this work, the validation of a newly constructed inverted rotating disk electrode (IRDE) reactor is reported. Compared to the rotating disk electrode (RDE) reactor, the working electrode is changed in position from the top to the bottom of the electrochemical cell. The IRDE reactor is designed to facilitate the actual study of gas evolution reactions. It is studied whether the first-order analytical expression for the velocity field in an RDE reactor is also acceptable for an IRDE configuration. To that purpose, the kinetic parameters of the well-known ferri/ferro cyanide redox system are determined in both configurations and compared. This is done qualitatively by comparing the polarization curves obtained in the inverted and the conventional RDE configuration. Additionally, a statistically founded fitting algorithm is used to quantitatively determine the model parameters of the oxidation and reduction reaction. Not only the diffusion coefficients of Fe2+ and Fe3+ are calculated, but also the rate constants (kox and kred) and the transfer coefficients (αox and αred) are quantified and compared together with their respective standard deviation. It is found that the parameters of mass and charge transfer in both configurations agree well. So it is concluded that the same analytical equations of mass and charge transfer can be used in both the RDE and the IRDE reactor. |
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Keywords: | Inverted rotating disk electrode IRDE Modeling Parameter estimation Ferri/ferrocyanide |
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