A Non‐enzymatic Ag/δ‐FeOOH Sensor for Hydrogen Peroxide Determination using Disposable Carbon‐based Electrochemical Cells | Zendy

Meira Flávio H. A. | Zendy; Resende Sayton F. | Zendy; Monteiro Douglas S. | Zendy; Pereira Márcio C. | Zendy; Mattoso Luiz H. C. | Zendy; Faria Ronaldo C. | Zendy; Afonso André S. | Zendy

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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 .

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