Effect of Carboxyl-Doped Graphene Nanoplatelets as an Electrode for Supercapacitors According to Surface Property Changes via the Control of Conditions

Ji-Woo Park, In-Yup Jeon () and Young-Wan Ju ()
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Ji-Woo Park: Department of Chemical Engineering, College of Engineering, Wonkwang University, Iksan 54538, Republic of Korea
In-Yup Jeon: Department of Chemical Engineering, College of Engineering, Wonkwang University, Iksan 54538, Republic of Korea
Young-Wan Ju: Department of Chemical Engineering, College of Engineering, Wonkwang University, Iksan 54538, Republic of Korea

Energies, 2023, vol. 17, issue 1, 1-12

Abstract: Energy storage systems (ESSs) are attracting increasing attention for the development of sustainable and renewable energy technologies owing to limited fossil fuels. Supercapacitors are gaining significant interest as energy storage devices owing to their high-power density and long-term cycle stability. The use of suitable electrode materials affects the performance of supercapacitors. In this study, we fabricated a carboxyl-doped graphene nanoplatelet (CGnP) via a mechanochemical reaction. Additionally, CGnP was activated by controlling parameters such as temperature, flow rate, and maintenance period and evaluated as an electrode material for supercapacitors. The effect of the specific surface area (SSA) and functional groups of the fabricated samples on the capacitance was confirmed by controlling the activation parameters. The activated CGnP with 300 mL/min of CO 2 at 1173 K for 4 h exhibited a high SSA of 1300 m 2 /g. The activated CGnP (180 F/g), with a high SSA, showed an increased capacitance of 46% compared to pristine CGnP (123 F/g). Additionally, activated CGnP1100 demonstrated good wettability and exhibited excellent stability with a low capacitance decrease of 6.1%, even after 10,000 cycles.

Keywords: activation process; graphene nanoplatelets; mechanochemical; surface properties; supercapacitor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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