Carbon nanostructures on capacitor electrodes

Abstract

Carbon nanostructures, such as carbon nanowires, nanotubes, nanosheets, have found applications in many areas – from electronics to medicine. Recently, they attracted particular attention as materials for energy storage due to their large aspect ratios, specific surface areas, and electrical conductivity. An efficient method for their deposition on metallic surfaces at atmospheric pressure is microwave plasma-enhanced chemical vapor deposition (MPECVD). In this study, metallic surfaces with deposited carbon nanostructures were used for preparation of capacitor electrodes. The capacitance of an electrolytic capacitor with metal electrodes without and with deposited carbon nanostructures was measured by an electronic system. The resulting high value of the capacitance of a capacitor with electrodes with deposited carbon nanostructures is discussed on the basis of these structures morphology as studied by SEM.

Simulations of a capacitor with graphene electrodes

“…Many different designs, electrode structures and types of electrolytes of capacitors with graphene structures on the electrodes have been studied [9][10][11][12]; however, to the best of our knowledge, no studies have so far been published involving a complete model of the behavior of such porous graphene-based capacitors due to their intricate morphology and the complex processes taking place on the electrodes. Carbon nanowires deposited on nickel foam showed a significant increase in the specific surface area of electrodes and, consequently, a greater capacitance of the modelled capacitor [13]. Vertical graphene sheets [14] have been deposited by microwave-plasma-enhanced CVD on nickel plate electrodes, which resulted in a further increase in the surface area of the capacitor electrodes.…”