| Preparation and Electrochemical Properties of Carbon Cryogel for Supercapacitor |
| Min-Seob Song, Sahn Nahm1, Young-Jei Oh |
Thin Film Materials Research Center, Korea Institute of Science and Technology
1Department of Materials Science and Engineering, Korea University |
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| ABSTRACT |
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Electrochemical properties of carbon cryogel electrode for the application of composite electrode materials mixed with metal oxide in supercapacitor have been studied. Carbon cryogels were synthesized by sol-gel polycondensation of resorcinol with form aldehyde, followed by a freeze drying, and then pyrolysis in an inert atmosphere. Physical properties of carbon cryogel were characterized by BET, X-ray diffraction (XRD) and scanning electron microscopy (SEM). It is found that carbon cryogel is amorphous material. The electrochemical properties of carbon cryogel were measured by cyclic voltammetry as a function of concentration of liquid electrolyte, galvanostatic charge-discharge with different scan rates and electrochemical impedance measurements. The result of cyclic voltammetry indicated that the specific capacitance value of a carbon cryogel electrode was approximately 150.2 F/g (at 5 mV/s in 6M KOH electrolyte). |
| Key words:
Carbon cryogel, Freeze drying, Specific capacitance, Galvanostatic charge/discharge, Supercapacitor |
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