New Materials Based on Carbon-Metal Nanocomposites for Supercapacitor Application

Abstract

In this report the approach is developed where the carbon nanotube – metallic nanoparticles composites are used as material of electrodes for electrochemical capacitors based on the double electric layer and pseudo-capacitance effect. To improve the pseudo-capacitance properties the ethanol as the auxiliary reagent is added to the electrolyte to enhance the redox reaction. As active electrode material the two types of carbon-metal composites: carbon nanotube – Ni nanoparticle composites (CNT–Ni) and carbon-palladium hybride films were prepared and studied. The peak on the potentiodynamic curve for CNT–Ni composite electrode in alkaline solutions of ethanol is observed which is ascribed to the ethanol oxidation in alkaline medium. The results obtained are discussed from the point of view both the double layer capacitance and the pseudo capacitance. The carbon-palladium hybride films were prepared by ion evaporation of integrate targets consisting of graphite and metallic palladium. Electron microscopy meas-urements showed that the nanoparticles of palladium were formed in graphite matrix with average dimen-sion of about 3 nm. The contribution of Pd nanoparticles to the electrochemical processes going on the sur-face of the films is considered from the point of view of their electrochemical properties . When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35509