An enzyme-free hydrogen peroxide sensor based on Ag/FeOOH nanocomposites

Abstract

Ag/FeOOH nanocomposites were synthesized and then immobilized on a pencil graphite electrode (PGE), resulting in the development of a new enzyme-free hydrogen peroxide sensor. UV-Vis absorption spectroscopy and transmission electron microscopy (TEM) were used to characterize the composition and morphology of the nanocomposites. In an electrochemical investigation, the nanocomposites displayed excellent electrocatalytic performance for H₂O₂; the current response of the sensor was linear between H₂O₂ concentrations of 0.03 and 15.0 mM, with a detection limit of 22.8 μM at a signal-to-noise ratio of 3; the sensitivity of the sensor was 8.07 μA mM⁻¹ cm⁻² and the response time was 3 s. The sensor also displayed favourable anti-interference. This study may provide a good nanomaterial and a simple method for the development of hydrogen peroxide sensors.