A novel H2O2 electrochemical sensor based on NiCo2S4 functionalized reduced graphene oxide

In this work, we successfully prepared NiCo2S4 nanoparticles decorated reduced graphene oxide through a facile method. The obtained NiCo2S4/rGO hybrids could be modified on a glassy carbon electrode to construct a highly sensitive non-enzymatic H2O2 sensor. The morphology and structure of the obtained NiCo2S4/rGO were characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The electrochemical performance of the NiCo2S4/rGO hybrids toward the reduction of H2O2 was reflected through the cyclic voltammetry and chronoamperometry data. The hybrids exhibit a fast response time within 5 s, wide linear range of 0.025 -11.25 mM, high sensitivity of 118.5 mu AmM-1 cm(-2), as well as low detection limit of 0.19 mu M. Such results demonstrate NiCo2S4/rGO hybrids is a promising candidate for the quantitative detection of H2O2. (C) 2019 Elsevier B.V. All rights reserved.