Generator-Sensor Impedance at Double Channel Electrodes. (1st March 2017)

• Record Type: Journal Article
• Authors: Holm, Thomas; Ingdal, Mats; Strobl, Jonathan R.; Fanavoll, Espen V.; Sunde, Svein; Seland, Frode; Harrington, David A.
• Is Part Of: Electrochimica acta. Volume 229(2017)
• Page Start: 452
• Page End: 457
• Publication Date: 2017-03-01
• Subjects: Channel electrode -- Electrochemical impedance spectroscopy -- Mass transport -- FEM; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.01.075
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract : Graphical abstract: Abstract : Highlights: A new generator-detector impedance method is used for double channel electrodes. Complex plane spectra are spirals. Experimental data are in good agreement with numerical simulation. A qualitative explanation and theoretical treatment explain the features. Data fall on a universal curve after scaling with a function of flow rate. Abstract: A method for measuring downstream concentration effects through electrochemical impedance spectroscopy at double channel electrodes is demonstrated. An ac current perturbation is applied at an upstream working electrode and the resulting ac potential response at a downstream sensing electrode is measured. This generator-detector scheme is implemented with a single potentiostat. Experimental data for a reversible redox couple are presented and good agreement is found with numerical simulations. A qualitative explanation of the features is given which lays the foundation for a more rigorous theoretical treatment. Relationships with flow rate and frequency are found that can scale the data to lie on a universal curve.