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

Abstract In view of the importance of rapid detection of H₂O₂, a carbon-based three-dimensional conductive network consisting of multiwalled carbon nanotubes (MWCNTs) and reduced graphene oxide (rGO) was introduced into the preparation of SnS₂ to obtain SnS₂/MWCNTs/rGO modified composite, which was prepared by one-step hydrothermal method. When the mass ratio of MWCNTs and rGO was 1:1, the composite had the best detection effect on H₂O₂. At this time, SnS₂ was uniformly distributed on the surface of tubular MWCNTs and flaky rGO, and MWCNTs were interspersed between layers of rGO. The synergistic effect of the three materials showed a high current response ability for the detection of H₂O₂. During the range of 0.238 ~ 12.267 mmol·L⁻ ¹, the linear equation was Ipc(mA) = -0.029–0.019c(m mol·L⁻ ¹), with a sensitivity of 388.28 µA·mmol⁻ ¹·L·cm⁻ ² and a detection limit of 0.236 µmol·L⁻ ¹(S/N = 3). Moreover, the prepared modified electrode also had a good selectivity, reproducibility and stability.