Preparation of SnS 2 /MWCNTs chemically modified electrode and its electrochemical detection of H 2 O 2

• Published in: Analytical and bioanalytical chemistry
• Main Authors: Duan, Zhihong, Huang, Chaolian, Yang, Xiaoxiao, Hu, Ailin, Lu, Xiaoying, Jiang, Qi
• Format: Journal Article
• Language: English
• Published: Germany 12-05-2020
• Subjects: SnS2/MWCNTs chemically modified electrode; Electrochemical rapid detection; H2O2
• ISSN: 1618-2650

Considering the importance of hydrogen peroxide (H
O
) rapid detection, a SnS
/MWCNTs composite was prepared by loading tin disulfide (SnS
) nanoparticles on a three-dimensional conductive network composed of multi-walled carbon nanotubes (MWCNTs). The obtained SnS
/MWCNTs composite was used as the modified material to prepare a chemically modified electrode (CME), which was used for the rapid detection of H
O
. 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
nanoparticles with a size of about 33 nm are evenly dispersed on the surface of MWCNTs. The obtained SnS
/MWCNTs-CME has a strong current response to H
O
: it has a good linear relationship during the range of 0.248 ~ 16.423 mmol L
, and its linear regression equation is I
(mA) = (-0.94 ± 0.05) × 10
 + (- 0.43 ± 0.06) × 10
c (mmol L
) (R
 = 0.997) with a sensitivity of 87.84 μA mmol
 L cm
. The corresponding detection limit is 1.04 μmol L
(S/N = 3). At the same time, the SnS
/MWCNTs-CME has good selectivity, reproducibility, and stability. Graphical abstract Uniformly distributed SnS
/CNTs composite is used to prepare a chemically modified electrode for H
O
detection. The prepared electrode has a strong electrochemical response to H
O
due to the excellent conductivity and support of CNTs. And the SnS
/CNTs electrode shows high sensitivity and selectivity for the electrochemical detection of H
O
.