A novel delta-MnO2 with carbon nanotubes nanocomposite as an enzyme-free sensor for hydrogen peroxide electrosensing

We have reported the synthesis and application of a delta-MnO2 with carbon nanotubes (delta-MnO2/CNTs) nanocomposite as an enzyme-free sensor for the detection of H2O2 through an electroreduction reaction, where delta-MnO2 serves as the catalytic center and CNTs as the highly conductive base material. The delta-MnO2/CNTs nanocomposite was synthesized via a simple and single-step hydrothermal process in alkaline solution without using any surfactants or templates. The electrochemical properties of the delta-MnO2/CNTs on a glassy carbon electrode were investigated by cyclic voltammetry, and amperometry. It was found that, under optimized conditions, the sensor fabricated electrode provides linear amperometric responses for H2O2 in a large concentration range from 0.05 to 22 mM and a detection limit of 1 mM with a comparatively high sensitivity of 243.9 mu A mM(-1) cm(-2). In addition, the delta-MnO2/CNTs modified GCE exhibits excellent selectivity, and good reproducibility for H2O2 detection. It is promising that the proposed H2O2 sensor can be used as an effective tool to measure the H2O2 in practical samples.