Amperometric detection of hydrogen peroxide using a nanofibrous membrane sputtered with silver

Abstract

In this study, a novel hydrogen peroxide (H₂O₂) electrochemical sensor was fabricated by covering a nanofibrous membrane on a glassy carbon electrode (GCE). Silver (Ag) nanoparticles were deposited on the two surfaces (front and back) of the nanofibrous membrane by a sputtering-deposition process with a high purity silver sputtering target. Cyclic voltammetric measurements revealed that the obtained nanofibrous membrane exhibited a well-defined pair of redox peaks and a prominent electrocatalytic activity toward H₂O₂. Amperometric measurements indicated that the sensor based on the silver coated nanofibrous membrane showed a linear response to H₂O₂ concentrations ranging from 10 μM to 16.5 mM with a detection limit of 4 μM and a maximum sensitivity of 157 mA cm⁻² M⁻¹. In addition, the sensor also exhibited good selectivity and stability, and can offer a novel method to detect H₂O₂.