▎ 摘　　要

The preparation, characterization, and electrochemical sensing potential of nickel disulphide (NiS2) based nanocomposite material is described. The nanocomposite was synthesized by a hydrothermal procedure and subsequently characterized by electron microscopy, X-ray diffraction (XRD) and XPS. The investigation of electrocatalytic activity of NiS2 based nanocomposites was performed for the reduction of 4-hydroxynitrobenzene (4-HNB) via cyclic voltammetry. The experimental parameters such as the effect of scan rate and pH have been optimized for the electrochemical detection of 4-HNB. The linear relationship between the peak current and the concentration of 4-HNB was found to be in the range of 0.1000-1053 mu M with an impressive detection limit of 59.5 nM. The performance of NiS2 based nanocomposites modified working electrode towards 4-HNB detection shows good stability, reproducibility with the recovery percentage of 99.3%. The results clearly depict the sensing performance and potential application of NiS2 based nanocomposites for the electrochemical detection of 4-HNB for the real-world analysis.