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http://dx.doi.org/10.5229/JKES.2013.17.1.57

Mesoporous Carbon Electrodes for Capacitive Deionization  

Lee, Dong-Ju (Department of Environmental Engineering, College of Engineering, Sangmyung University)
Park, Jin-Soo (Department of Environmental Engineering, College of Engineering, Sangmyung University)
Publication Information
Journal of the Korean Electrochemical Society / v.17, no.1, 2014 , pp. 57-64 More about this Journal
Abstract
Carbon electrodes for capacitive deionization were fabricated through mixing two different carbon powders (activated carbon powder, carbon black) with different particle sizes to investigate physical or electrochemical properties and finally desalination performances of the electrodes with various compositions of two carbon powders in weight and were compared with the electrode consisting of activated carbon. As a result, the electrode structure became more packed as increasing the amount of carbon black and resulted in 10% increase in mesopore fraction. The specific capacitance obtained from cyclic voltammograms of various electrodes showed that the electrode containing carbon black only had 107.4 F/g, while the specific capacitance of the electrode having more amount of carbon black increased and was higher than the one having no carbon black. The results of desalination runs in a capacitive deionization cell exhibited that the electrode having the highest amount of carbon black (1 wt%) in this study had the highest desalting efficiency, and no significant pH variation was observed during the runs. It was analyzed using accumulated charge that the fraction of non-Faraday current increased as the amount of carbon black increased in the electrodes. It can be concluded that the addition of carbon black changed the electrode structure resulting in an increase in the fraction of mesopore and finally enhanced the desalting efficiency by decreasing Faraday current.
Keywords
Mesoporous carbon electrode; Capacitive deionization; Activated carbon; Carbon black; Mesopore; Faraday reaction;
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Times Cited By KSCI : 7  (Citation Analysis)
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