Abstract
The investigation describes surface modification of a glycerol-based carbon for enhanced capacitance. Glycerol was reacted with sulphuric acid, and the resulting carbon (GBC-120) was impregnated with known amount of KOH. The mixture was heated at 800 °C in N2 atmosphere to obtain thermochemically activated carbon GBCK. For comparison, GBC-120 was also heated in absence of KOH in N2 atmosphere at 800 °C to prepare carbon GBC-800. The infrared spectra display bands at 1625 and 1073 cm−1, respectively due to CC and SO3H functionality. BET analysis revealed that thermochemical activation resulted in evolution of pores in carbon structure with relatively large pore volume of 1.76 cm3 g−1 and surface area of 1653 m2 g−1 for GBCK in comparison to very low pore volume (0.06 & 0.08 cm3 g−1) and surface area (21 & 425 m2 g−1) for samples GBC-120 and GBC-800 respectively. The activated carbon GBCK showed significantly higher specific capacitance of 219 mF cm−2 as compared to commercial activated carbon and CNT.
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