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A Non‐enzymatic Ag/δ‐FeOOH Sensor for Hydrogen Peroxide Determination using Disposable Carbon‐based Electrochemical Cells
Author(s) -
Meira Flávio H. A.,
Resende Sayton F.,
Monteiro Douglas S.,
Pereira Márcio C.,
Mattoso Luiz H. C.,
Faria Ronaldo C.,
Afonso André S.
Publication year - 2020
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.202060171
Subject(s) - hydrogen peroxide , detection limit , fourier transform infrared spectroscopy , ascorbic acid , scanning electron microscope , electrochemistry , electrochemical gas sensor , nuclear chemistry , nanocomposite , materials science , chemistry , carbon paste electrode , cyclic voltammetry , chromatography , chemical engineering , nanotechnology , electrode , organic chemistry , food science , engineering , composite material
A non‐enzymatic sensor for hydrogen peroxide (H 2 O 2 ) determination based on Ag/δ‐FeOOH nanocomposite immobilized on an all‐plastic disposable carbon‐based electrochemical cell (DCell) is constructed by a rapid prototyping technique. Ag/δ‐FeOOH is synthesized by a simple and reproducible method and its structural and morphological properties characterized by X‐ray diffraction (XRD), Fourier transform‐infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The Ag/δ‐FeOOH is successfully immobilized on the DCell, as revealed by SEM images. The electrochemical investigation indicates that the Ag/δ‐FeOOH/DCell has a good electrocatalytic response for the H 2 O 2 reduction, showing detection limit of 71 μmol L −1 H 2 O 2 at a signal‐to‐noise ratio of 3 and analytical sensitivity of 215.4 μA mM −1 cm −2 . Moreover, Ag/δ‐FeOOH/DCell can be used to selectively detect H 2 O 2 in the presence of dopamine (DA), uric acid (UA), and ascorbic acid (AA). Finally, Ag/δ‐FeOOH/DCell can be used to determine H 2 O 2 in fetal bovine serum. The achieved results indicate that the non‐enzymatic Ag/δ‐FeOOH/DCell is a cost‐effective alternative for the determination of H 2 O 2 .