1. A Non‐enzymatic Ag/δ‐FeOOH Sensor for Hydrogen Peroxide Determination using Disposable Carbon‐based Electrochemical Cells.
- Author
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Meira, Flávio H. A., Resende, Sayton F., Monteiro, Douglas S., Pereira, Márcio C., Mattoso, Luiz H. C., Faria, Ronaldo C., and Afonso, André S.
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HYDROGEN detectors , *HYDROGEN peroxide , *SILVER ions , *SCANNING electron microscopy , *DETECTION limit , *RAPID prototyping , *ELECTRIC batteries - Abstract
A non‐enzymatic sensor for hydrogen peroxide (H2O2) 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 H2O2 reduction, showing detection limit of 71 μmol L−1 H2O2 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 H2O2 in the presence of dopamine (DA), uric acid (UA), and ascorbic acid (AA). Finally, Ag/δ‐FeOOH/DCell can be used to determine H2O2 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 H2O2. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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