Bulk Concentration Dependence of Electrolyte Resistance Within Mesopores of Carbon Electrodes in Electric Double‐Layer Capacitors. (14th January 2016)

• Record Type: Journal Article
• Authors: Kim, Jaekwang; Kim, Daeun; Lee, Ilbok; Shim, Hyewon; Lee, Jinwoo; Son, Hyungbin; Lee, Donghyun; Yoon, Songhun
• Is Part Of: Bulletin of the Korean Chemical Society. Volume 37:Number 2(2016)
• Page Start: 213
• Page End: 218
• Publication Date: 2016-01-14
• Subjects: Hexagonally ordered mesoporous carbon -- Electric double‐layer capacitor -- Electrolyte resistance -- Mesopore -- Imaginary capacitance analysis -- Chronoamperometry -- Chronopotentiometry -- Confinement effect; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/bkcs.10657
• Languages: English
• ISSNs: 0253-2964

Abstract

Abstract : Abstract : Hexagonally ordered mesoporous carbon materials were prepared and used as electrode materials in an electric double‐layer capacitor. Using this electrode, the change of electrolyte resistance within the mesopores was investigated according to the bulk electrolyte concentration. Using three different electrochemical transient experiments—imaginary capacitance analysis, chronoamperometry, and chronopotentiometry—the time constant associated with electrolyte transport was determined, which was then used to obtain the electrolyte resistance within the mesopores. With decreasing electrolyte concentration, the increase in electrolyte resistance was smaller than the increase in the resistivity of the bulk electrolyte, which is indicative of a different environment for ionic transport within the mesopores. On using the confinement effect within the mesopores, the predicted higher concentration within mesopore probably results in lower electrolyte resistance, especially under low bulk concentrations.