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

Considering the importance of hydrogen peroxide (H 2 O 2 ) rapid detection, a SnS 2 /MWCNTs composite was prepared by loading tin disulfide (SnS 2 ) nanoparticles on a three-dimensional conductive network composed of multi-walled carbon nanotubes (MWCNTs). The obtained SnS 2 /MWCNTs composite was used as the modified material to prepare a chemically modified electrode (CME), which was used for the rapid detection of H 2 O 2 . 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 SnS 2 nanoparticles with a size of about 33 nm are evenly dispersed on the surface of MWCNTs. The obtained SnS 2 /MWCNTs-CME has a strong current response to H 2 O 2 : 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) × 10 −2 + (− 0.43 ± 0.06) × 10 −2 c (mmol L −1 ) ( R 2 = 0.997) with a sensitivity of 87.84 μA mmol −1 L cm −2 . The corresponding detection limit is 1.04 μmol L −1 (S/ N = 3). At the same time, the SnS 2 /MWCNTs-CME has good selectivity, reproducibility, and stability. Graphical abstract Uniformly distributed SnS 2 /CNTs composite is used to prepare a chemically modified electrode for H 2 O 2 detection. The prepared electrode has a strong electrochemical response to H 2 O 2 due to the excellent conductivity and support of CNTs. And the SnS 2 /CNTs electrode shows high sensitivity and selectivity for the electrochemical detection of H 2 O 2 .