Preparation of SnS2/MWCNTs chemically modified electrode and its electrochemical detection of H2O2

摘要

Considering the importance of hydrogen peroxide (H2O2) rapid detection, a SnS2/MWCNTs composite was prepared by loading tin disulfide (SnS2) nanoparticles on a three-dimensional conductive network composed of multi-walled carbon nanotubes (MWCNTs). The obtained SnS2/MWCNTs composite was used as the modified material to prepare a chemically modified electrode (CME), which was used for the rapid detection of H2O2. The morphology and structure of the obtained samples were characterized and analyzed by scanning electron microscopy, X-ray diffraction, and energy-dispersive spectroscopy. The electrochemical performance of the modified electrode was researched by cyclic voltammetry, amperometric i-t curves, and AC impedance techniques. The results show that SnS2 nanoparticles with a size of about 33 nm are evenly dispersed on the surface of MWCNTs. The obtained SnS2/MWCNTs-CME has a strong current response to H2O2: it has a good linear relationship during the range of 0.248 +/- 16.423 mmol L-1, and its linear regression equation is I-pa (mA) = (-0.94 +/- 0.05) x 10(-2) + (- 0.43 +/- 0.06) x 10(-2)c (mmol L-1) (R-2 = 0.997) with a sensitivity of 87.84 mu A mmol(-1) L cm(-2). The corresponding detection limit is 1.04 mu mol L-1 (S/N = 3). At the same time, the SnS2/MWCNTs-CME has good selectivity, reproducibility, and stability.