Electrochemical Impedance Spectroscopy in a Droplet of Solution for the Investigation of Liquid/Solid Interface - Sorbonne Université Access content directly
Journal Articles Analytical Chemistry Year : 2016

Electrochemical Impedance Spectroscopy in a Droplet of Solution for the Investigation of Liquid/Solid Interface

Abstract

The local electrochemical behavior of a solid− liquid interface can be studied by electrochemical impedance spectroscopy (EIS). The investigated surface area can be delimited by adding a drop of solution, which forms an interface between the liquid drop and the working electrode, and performing the measurements inside. The size of the drop must be sufficiently small for a simultaneous wettability characterization (from the contact angle measurement) and appropriately large so that wettability is not influenced by the presence of the working and the counter electrode inserted in the droplet. In this work, we showed that EIS measurements can be performed in a solution droplet of 2 to 4 μL, although the electrochemical cell lacks the usual geometry. For our measurements, we studied a model system consisting of a KCl aqueous solution of [Fe(CN)6]3−/4− redox couple at a Pt electrode. All the results were compared with those obtained for a bulk configuration. The sessile drop configuration and the EIS response were modeled using finite element method for different electrode sizes and configurations to account for electrochemical kinetics and both current and potential distributions.
No file

Dates and versions

hal-01420889 , version 1 (21-12-2016)

Identifiers

Cite

Camila Molena de Assis, Thu Huong Ho, Hercilio Gomes de Melo, Michel Keddam, Mireille Turmine, et al.. Electrochemical Impedance Spectroscopy in a Droplet of Solution for the Investigation of Liquid/Solid Interface. Analytical Chemistry, 2016, 88 (24), pp.12108 - 12115. ⟨10.1021/acs.analchem.6b02795⟩. ⟨hal-01420889⟩
125 View
0 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More