Abstract
Carbon-based hybrid structures have attracted much attention due to their superior chemical, thermal, mechanical and electrical properties. A 3D sponge-like structure based on reduced graphene oxide/carbon nanotubes decorated with zinc sul fide synthetized by a hydrothermal micro-wave assisted synthesis (MHS) was produced and its chemical, structural, morphological and electrochemical properties evaluated as electrodes for supercapacitor devices. XRD con firmed the structure of the nano-composite, XPS was performed to examine the chemical state of the compounds. The morphology analysis realized by FESEM con firmed the success of the proposed methodology to produce the rGO/MWCNTf-ZnS nanocomposites revealing good homogeneity. The electrochemical properties were studied by cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge. It was observed that the increase of MWCNTf-ZnS content increased the specific capacitance and reduced the resistivity of the 3D hybrid structure, reaching 95 F g(-1) , thus, approaching the ideal electric double layer storage capacitor behavior in samples containing MWCNTf-ZnS. (C) 2020 Elsevier B.V. All rights reserved.