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A General Approach Based on Sampled‐Current Voltammetry for Minimizing Electrode Fouling in Electroanalytical Detection
Author(s) -
Mazerie Isabelle,
Didier Pierre,
Razan Florence,
Hapiot Philippe,
Coulon Nathalie,
Girard Aurélie,
de Sagazan Olivier,
Floner Didier,
Geneste Florence
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700884
Subject(s) - passivation , voltammetry , electrode , saturated calomel electrode , cyclic voltammetry , analytical chemistry (journal) , linear sweep voltammetry , dropping mercury electrode , reference electrode , quinhydrone electrode , materials science , absolute electrode potential , fouling , anodic stripping voltammetry , chemistry , electrochemistry , nanotechnology , chromatography , layer (electronics) , biochemistry , membrane
Electrochemical analysis of species known to passivate electrode surfaces remains challenging. We previously proposed a new method, dealing with sampled‐current voltammetry performed on an electrode array to mimic polarography at a dropping mercury electrode for the detection of copper. In this work, we study the effectiveness of this method to circumvent electrode fouling with the analysis of phenol solutions at high concentrations (10 −2 mol L −1 ), known to polymerize on electrode surface during its oxidation. Electrode arrays well‐adapted to the analysis with such system are prepared by photolithography and characterized by X‐ray photoelectron spectroscopy, X‐ray diffraction, and voltammetry. Although analyses performed in conventional linear voltammetry or sampled‐current voltammetry on a single electrode are considerably affected by electrode fouling, a linear calibration plot was achievable using our method. Modeling of the electrochemical signal showed that the current depends only on the applied potential and a parameter characteristic of the passivation phenomenon. It also underlined that sampled‐current voltammetry on an electrode array can circumvent the problem of passivation by a judicious choice of the sampling time.