Carbon Dioxide Activated SiC-CDC: Attractive Material for Supercapacitor Electrodes. (8th December 2015)

• Record Type: Journal Article
• Authors: Jänes, Alar; Tee, Ester; Tallo, Indrek; Thomberg, Thomas; Lust, Enn
• Is Part Of: ECS transactions. Volume 69:Number 24(2015)
• Page Start: 1
• Page End: 10
• Publication Date: 2015-12-08
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/06924.0001ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : Carbide-derived carbons (CDCs) were synthesized from SiC powders (SiC-CDC) via gas phase chlorination within the temperature range from 1000 ºC to 1100 ºC. Thereafter the CDCs were additionally activated by CO2 treatment method, resulting in nearly two-fold increase in specific surface area. The low-temperature nitrogen sorption experiments were performed and the specific surface areas from 1100 m 2 g -1 up to 2270 m 2 g -1 were obtained, depending on the extent of CO2 activation. The energy and power density characteristics of the supercapacitors based on 1 M (C2 H5 )3 CH3 NBF4 solution in acetonitrile and SiC-CDC as an electrode material were investigated using the cyclic voltammetry, electrochemical impedance spectroscopy, galvanostatic charge/discharge and constant power discharge methods. The electrochemical data indicated two-times increase in specific capacitance. The activation of SiC-CDC with CO2 significantly increases (more than 40%) the performance of the supercapacitors, especially at higher potential scan rates and at higher power loads.