Síntese e caracterização de Sulfeto de Cobre/Carbono: eletrodo tipo bateria para aplicação em dispositivo de armazenamento de energia

Abstract

The aggravation of the energy crisis and the use of non-renewable fuels led researchers to the development of new energy conversion and storage systems. Current research is focused on the development of more efficient devices and energy storage. In this work, the hydrothermal method in a single step was used to produce CuS and CuS / Carbon materials (in different concentrations of glucose) and the effect of the addition of glucose in the crystallite size, as well as in the electrochemistry response of these materials, was observed. Scanning electron microscopy (SEM) showed the formation of spheroidal microstructures and their morphological influence in obtained carbons. The X-Ray Diffraction (XRD) analysis confirmed the formation of Covellite CuS (Card No. 06-0646). The behavior of the average crystallite size (20.06; 18.81; 14.75 and 12.22 nm) was observed due to the addition of glucose for the respective syntheses (CuS; CuS / C-75; CuS / C -150 and CuS / C-300), using the Debye-Scherrer formula. Raman spectroscopy confirmed the presence of CuS and carbon in the synthesized samples. The specific capacity values (107.23; 50.04; 67.28 and 15.07 mAh.g-1), obtained by the Galvanostatic Discharge curves at the current density of 0.7 A.g-1, respectively for CuS; CuS / C-75; CuS / C-150 and CuS / C-300. For these electrodes the values of energy density and power were calculated respectively (37.53; 10.33; 21.68 and 4.97 Wh.Kg-1) and (166.67; 145.83; 218.75 and 350.00 W.Kg-1). CuS and CuS / C-150 electrodes showed promising electrochemical characteristics for application in an energy storage device.