A Non‐enzymatic Ag/δ‐FeOOH Sensor for Hydrogen Peroxide Determination using Disposable Carbon‐based Electrochemical Cells. Issue 10 (14th July 2020) - de Meira, Flávio H. A.
Abstract: A non‐enzymatic sensor for hydrogen peroxide (H2 O2 ) 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 H2 O2 reduction, showing detection limit of 71 μmol L −1 H2 O2 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 H2 O2 in the presence of dopamine (DA), uric acid (UA), and ascorbic acid (AA). Finally, Ag/δ‐FeOOH/DCell can be used to determine H2 O2 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 H2 O2 . Abstract :