Indirect amperometric detection of non-redox ions using a ferrocene-functionalized and oriented mesoporous silica thin film electrode
| Autor: | Neus Vilà, Cheryl Karman, Christelle Despas, Alain Walcarius |
|---|---|
| Přispěvatelé: | Laboratoire de Chimie Physique et Microbiologie pour l'Environnement (LCPME), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC) |
| Rok vydání: | 2017 |
| Předmět: |
Flow injection analysis
Materials science General Chemical Engineering Inorganic chemistry Ion chromatography Analytical chemistry 02 engineering and technology Square wave Mesoporous silica 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Amperometry 0104 chemical sciences chemistry.chemical_compound Ferrocene chemistry [CHIM.ANAL]Chemical Sciences/Analytical chemistry Electrode 0210 nano-technology |
| Zdroj: | Electrochimica Acta Electrochimica Acta, Elsevier, 2017, 228, pp.659-666. ⟨10.1016/j.electacta.2017.01.126⟩ |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2017.01.126 |
| Popis: | International audience; Vertically oriented and ferrocene functionalized mesoporous silica thin films have been prepared by combining the electrochemically assisted self-assembly (EASA) method with click chemistry. The resulting films are electroactive, involving an electron hopping mechanism between adjacent ferrocene moieties. The electrochemical oxidation of ferrocene into ferricinium ion generates positive charges that are compensated by the ingress of anions into the film, opening the door to possible indirect amperometric detection of non-electroactive anions by flow injection analysis. Operating in an electrolyte-free flow, each injection of an anion (e.g., NO3−) at an electrode biased at a suitable positive potential (i.e., +0.5 V) gave rise to an amperometric response proportional to the anion concentration. However, to avoid the decrease of the electrochemical signal due to the progressive consumption of ferrocene in multiple successive analyses, it was necessary to regenerate the electrode by reduction of ferricinium moieties, which can be achieved in-situ by square wave amperometry. The feasibility to apply such indirect amperometric detection scheme in suppressed ion chromatography (for detecting anions in mixture) was also demonstrated. |
| Databáze: | OpenAIRE |
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