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Prussian Blue Films Produced by Pentacyanidoferrate(II) and Their Application as Active Electrochemical Layers
Author(s) -
Morandi Pires Bruno,
Venturinelli Jannuzzi Sergio Augusto,
Barboza Formiga André Luiz,
Alves Bonacin Juliano
Publication year - 2014
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201402760
Subject(s) - prussian blue , chemistry , ascorbic acid , electrochemistry , inorganic chemistry , ferrocyanide , electrode , detection limit , glassy carbon , electrocatalyst , cyclic voltammetry , chromatography , food science
Abstract Iron complexes such as ferri/ferrocyanides are usually employed as electrochemical mediators in portable devices for the quick diagnosis of diseases. Stable complexes designed for the electrochemical active layer may render devices with better performance and lifetimes than conventional devices. In this work we have synthesized and characterized spectroscopically, electrochemically, and by DFT the complex Na 4 [Fe(CN) 5 (isn)] (isn = isonicotinate). This complex was used as a single‐source precursor of Prussian Blue (PB) in solution at pH 2.0 and 3.0, as confirmed by UV/Vis spectroscopy. Potentiostatic deposition of PB onto glassy carbon electrodes provided stable films at pH 3.0 and 5.0, with electrocatalytic activity for ascorbic acid oxidation with a linear response in the range 20–200 μ M and an limit of detection of 12 μ M . The anodic peak potential of the modified electrodes varied with solution pH with a minimum value of 0.350 V versus NHE at pH 5.0.