Abstract
As an important element of energy storage systems, Supercapacitors are energy storage devices with high power density. In order to ensure their high efficiency, along with a high specific capacitance, it is important to lower their series resistance. Carbon materials with a high specific surface area have been widely used as potential electrode material for supercapacitors, however their insufficiently low electrical resistivity limits the energy and power density of the device. Therefore, for optimizing the energy storage and power capability of supercapacitors, development of composite materials electrodes with optimized properties and low electric resistance is crucial. In this article, composite electrodes based on a combination of activated carbon and graphene are obtained and their properties are investigated. The capacitive performance of the composite electrodes is tested in an electrochemical cell and their advantage ] for lowering the electrical resistance of the device is shown.