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

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 mu M at a signal-to-noise ratio of 3; the sensitivity of the sensor was 8.07 mu A 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.