Activated Carbon-Embedded Reduced Graphene Oxide Electrodes for Capacitive Desalination

Capacitive deionization of saline water is one of the most promising water purification technologies due to its high energy efficiency and cost-effectiveness. This study synthesizes porous carbon composites composed of reduced graphene oxide (rGO) and activated carbon (AC) with various rGO/AC ratios...

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Bibliographic Details
Published in:Journal of electrochemical science and technology 2023, Vol.14 (3), p.222-230
Main Authors: Tarif Ahmed, Jin Sun Cha, Chan-gyu Park, Ho Kyong Shon, Dong Suk Han, Hyunwoong Park
Format: Article
Language:Korean
Online Access:Get full text
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Summary:Capacitive deionization of saline water is one of the most promising water purification technologies due to its high energy efficiency and cost-effectiveness. This study synthesizes porous carbon composites composed of reduced graphene oxide (rGO) and activated carbon (AC) with various rGO/AC ratios using a facile chemical method. Surface characterization of the rGO/AC composites shows a successful chemical reduction of GO to rGO and incorporation of AC into rGO. The optimized rGO/AC composite electrode exhibits a specific capacitance of ~243 F g-1 in a 1 M NaCl solution. The galvanostatic charging-discharging test shows excellent reversible cycles, with a slight shortening in the cycle time from the ~260th to the 530th cycle. Various monovalent sodium salts (NaF, NaCl, NaBr, and NaI) and chloride salts (LiCl, NaCl, KCl, and CsCl) are deionized with the rGO/AC electrode pairs at a cell voltage of 1.3 V. Among them, NaI shows the highest specific adsorption capacity of ~22.2 mg g-1. Detailed surface characterization and electrochemical analyses are conducted.
ISSN:2093-8551
2288-9221