Characterization of the mass transfer fluxes in a capacitive desalination cell by using FeIII(CN)63−/FeII(CN)64− redox couple as an electrochemical probe

Assane Sene (1, 2) , Barbara Daffos (1, 2) , Pierre-Louis Taberna (1, 2) , Patrice Simon (1, 2)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 RS2E - Réseau sur le stockage électrochimique de l'énergie

This paper focuses on the characterization of an electrochemical flow cell designed for capacitive desalination, by using the FeIII(CN)63−/FeII(CN)64− redox couple as an electrochemical probe. A relationship between the potential scan rate and the electrolyte flow rate has been first established by defining a dimensionless number, θ. Depending on the θ values, two regime domains – dependent and non-dependent from the flow rate - have been defined. The dimensionless number θ was found to be of great help for defining the suitable flow rate for several carbon based electrodes exhibiting different surface area, using FeIII(CN)63−/FeII(CN)64− redox couple as an electrochemical probe. The proposed electrochemical analysis is a way to optimize the performance of an electrochemical flow cell for capacitive desalination applications.

Mots clés: Cyclic voltammetry; Mass transfer; Desalinization; Flow; Activated carbon

Domaines: Matériaux; Energie électrique

Assane Sene, Barbara Daffos, Pierre-Louis Taberna, Patrice Simon. Characterization of the mass transfer fluxes in a capacitive desalination cell by using FeIII(CN)63−/FeII(CN)64− redox couple as an electrochemical probe. Journal of Electroanalytical Chemistry, 2019, 842, pp.127-132. ⟨10.1016/j.jelechem.2019.04.060⟩. ⟨hal-02308337⟩