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Electrochemical Properties of Porous Carbon Electrode as a Function of Internal Electrolyte Concentration  

Park, Byeong-Hee (Department of Chemical Engineering, Kongju National University)
Choi, Jae-Hwan (Department of Chemical Engineering, Kongju National University)
Publication Information
Applied Chemistry for Engineering / v.20, no.6, 2009 , pp. 700-704 More about this Journal
Abstract
The electrochemical properties of porous carbon electrodes as a function of their internal electrolyte concentration were investigated. Cyclic voltammetry, chronoamperometry, and impedance spectroscopic analysis were conducted for carbon electrodes equilibrated with 0.01, 0.05, 0.1, and 0.5 M KCl solution and covered with a cation-exchange membrane. The specific capacitance of the electrodes increased as the internal electrolyte concentration increased, due to a decrease in charging resistance. Experimental results indicated that the salt removal efficiency of the membrane capacitive deionization process could be enhanced by increasing the internal electrolyte concentration, even for an influent with a low salt concentration.
Keywords
carbon electrode; capacitive deionization; capacitance; cyclic voltammetry; impedance spectroscopy;
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