Polyaniline-intercalated manganese dioxide nanolayers prepared by a delamination/reassembling process and its application for hydrogen peroxide sensing

Abstract

In this study, polyaniline-intercalated MnO2 (PANI-MnO2) nanolayers were prepared by a delamination/reassembling process, in which the chemical oxidation polymerization of aniline and the reduction of MnO4− to MnO2 occur simultaneously. The morphology and chemical composition of the synthesized PANI-MnO2 were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, and transmission electron microscopy. A modified glassy carbon electrode based on PANI-MnO2 was designed as the electrochemical sensor for hydrogen peroxide. The electrochemical behavior of the modified electrode was investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and amperometry. The results showed that PANI-MnO2 had better electrocatalytic activity in the reduction of hydrogen peroxide than pure MnO2, with wide linear ranges at concentrations between 1.0×10−5 and 1.89×10−3 mol/L and between 1.89×10−2 and 30.89×10−2 mol/L, with high sensitivities of 33.4 and 57.6 μA/(mmol.cm2), respectively, and a satisfactory recovery rate of approximately 94.2–105%. Therefore, the prepared sensor can be a promising tool for the detection of hydrogen peroxide in real-life application.