Au NPs–Ni(OH)2–Cu nanocomposites enhanced electrochemical properties for detection ofH2O2

Abstract

Ni(OH)₂ nanoplates grown on Cu substrate were synthesized by a simple hydrothermal method. Au nanoparticles were dropped onto Ni(OH)₂ nanoplates according to optimal ratio to get Au NPs–Ni(OH)₂–Cu nanocomposites. These were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and X-ray energy dispersive spectrometer (EDS). The electrode (Au NPs–Ni(OH)₂–Cu/glassy carbon electrode) constructed by the composites was evaluated by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and typical amperometric response (i-t). Its wide linear range covered 2.5 μM to 1229.5 μM for the detection of peroxide hydrogen (H₂O₂), the optimized detection limit 0.3 μM (S/N = 3) and the response time was less than 3 s. Besides, the proposed electrode showed satisfactory selectivity, and good stability.