Síntese hidrotermal do sulfeto de níquel/carbono para aplicação em supercapacitores

Abstract

The materials research for high efficiency in energy storage has grown in recent years. Different phases of NiS for application in supercapacitors have been synthesized at different temperatures by hydrothermal method, which is a simple and low cost way. In this work different phases of NiS in powdered carbon were obtained, and their evaluation was made for use in supercapacitors. The material obtained showed better electrochemical properties in the condition synthesis 2 mmol of Na2 S · 9H2O, 1 mmol of Ni (NO3) 2 · 6H2O and 10% by weight of Vulcan carbon at 160 ° C, with a specific capacitance value of 685,66 F g-1. The NiS / Carbon was able to provide a good power density, 327.87 W kg-1, with an energy density of 15.24 Wh kg -1 and 26.10% of capacitance retention after 1000 cycles. The low values of energy density and capacitance retention can be justified by the material amorphous morphology, which has a direct influence on the interaction of the electrode with the electrolyte. Due to these results, the obtained NiS / Carbon is a material with potential use for the application in electrochemical capacitors.