Activated Carbon-Embedded Reduced Graphene Oxide Electrodes for Capacitive Desalination
- Publisher:
- KOREAN ELECTROCHEMISTRY SOC
- Publication Type:
- Journal Article
- Citation:
- Journal of Electrochemical Science and Technology, 2023, 14, (3), pp. 222-230
- Issue Date:
- 2023-08-01
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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 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 ~260-1 to the 530thcycle. 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 specificth adsorption capacity of ~22.2 mg g. Detailed surface characterization and electrochemical analyses are conducted.-1.
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