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

Abstract

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 33nm 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 ~ 16.423mmolL-1, and its linear regression equation is Ipa (mA) = (-0.94 ± 0.05) × 10-2 + (- 0.43 ± 0.06) × 10-2c (mmolL-1) (R2 = 0.997) with a sensitivity of 87.84μAmmol-1Lcm-2. The corresponding detection limit is 1.04μmolL-1 (S/N = 3). At the same time, the SnS2/MWCNTs-CME has good selectivity, reproducibility, and stability. Graphical abstract Uniformly distributed SnS2/CNTs composite is used to prepare a chemically modified electrode for H2O2 detection. The prepared electrode has a strong electrochemical response to H2O2 due to the excellent conductivity and support of CNTs. And the SnS2/CNTs electrode shows high sensitivity and selectivity for the electrochemical detection of H2O2.