Preparation Of MoS₂-based Nanocomposites And Their Electrochemical Application

During recent years, more and more attention are focused on the research of metal sulfides, especially 2D transition metal sulfides in electrochemical application. In this paper, several kinds of nanocomposites with MoS2 as the basic material were synthesized, include CTAB/MoS2/Pd and MoS2/Pt nanocomparticles. Techniques such as powder X-ray diffraction (XRD), scanning electron micrographs (SEM) and infrared spectroscopy (FT-IR) were used to characterize the as-prepared. The as-prepared nanocomposites are applied in the following studies. The main results can be summarized as follows:1 Synthesis of flower-like MoS2/Pd(Pt) nanocomposites and their characterizationIn this work, flower-like molybdenum disulfide (MoS2) was prepared by a simple hydrothermal method. The scanning electron microscopy (SEM) images and powder X-ray diffraction (XRD) showed the MoS2 nanoflower had sizes with diameter of about 500 nm and was constructed with many irregular sheets as a petal-like structure with thickness of several nanometers. The MoS2/Pd and MoS2/Pt nanocomposites were synthesized by chemical reduction method. The characteristic peaks of MoS2 were observed in XRD patterns. The prepared MoS2 and its nanocomposites containing S-Mo bond stretching vibration in IR spectra analysis.2 Fabrication of electrochemical sensor of bisphenol A based on flower-like MoS2/Pd nanocompositesIn this work, an electrochemical sensor for the detection of BPA was constructed based on the flower-like MoS2/Pd nanocomposites, modified on the glassy carbon eletrode (GCE). The effect of different factors, such as scanning rate, pH, the modification amount of CTAB/MoS2/Pd and accumulation time were investigated. The sensor showed an efficient electrocatalytic role for the oxidation of BPA, and the oxidation potentials of BPA has a tendency to decrease and the peak current increased compared with bare GCE and other modified electrode. A good linear relationship between the oxidation peak current and BPA concentration was obtained in the range from 0.1 to 50 μM with a detection limit of 8.01×10-7mol/L (S/N=3). The developed sensor exhibited good sensitivity and stability, and was successfully used for the determination of BPA in aqueous solution. This experiment also indicated the MoS2 nanoflowes were promising in the electrochemical sensing and catalytic application.