Modeling of mass and charge transfer in an inverted rotating disk electrode (IRDE) reactor

van Parys, Heidi; Tourwé, Els; Breugelmans, Tom; Depauw, Marnix; Deconinck, Johan; Hubin, Annick

doi:10.1016/J.JELECHEM.2008.05.004

Title

Modeling of mass and charge transfer in an inverted rotating disk electrode (IRDE) reactor

Author

van Parys, Heidi

Tourwé, Els

Breugelmans, Tom

Depauw, Marnix

Deconinck, Johan

Hubin, Annick

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 RIDE 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 RIDE 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 (k(ox) and k(red)) and the transfer coefficients (alpha(ox) and alpha(red)) 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.

Language

English

Source (journal)

Journal of electroanalytical chemistry and interfacial electrochemistry. - Lausanne, 1967 - 1992

Publication

Lausanne : 2008

ISSN

0022-0728 [print]

2590-2954 [online]

DOI

10.1016/J.JELECHEM.2008.05.004

Volume/pages