1. Nanohole-created carbon nanofibers for graphene-based supercapacitors.
- Author
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Seol, Jaechang, Lim, Gil Hwan, Lee, Jimin, David, Selvaraj, and Kahng, Yung Ho
- Subjects
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CARBON nanofibers , *ELECTRODE performance , *SUPERCAPACITORS , *STANDARD hydrogen electrode , *ELECTROCHEMICAL analysis , *POTASSIUM hydroxide - Abstract
Manifold graphene-based supercapacitor (GSC) electrodes have been extensively studied recently. Numerous studies have aimed to improve the performance of GSCs by amending the surface using various treatments or by incorporating diverse materials. However, few studies have been conducted on the treatments for the back electrodes which support the active material in the GSCs. Herein, the activation of carbon nanofibers (CNFs) back electrodes was achieved through simple thermal activation using potassium hydroxide (KOH) as an activating agent to enhance the electrochemical performance of GSC electrodes. The optimized sample exhibited a specific capacitance (C sp) of 210 F/g at 100 mV/s without adversely affecting the self-discharge behavior of the electrodes. Compared to the reference electrodes formed on the nonactivated CNFs, the C sp at high rate operations of the GSC electrodes was markedly increased by 1.6 times. Morphological, elemental, and electrochemical analyses were conducted to study the effects of KOH activation on the performance enhancement of GSC electrodes. Our results present a novel research approach for enhancing GSC performance. [Display omitted] • KOH thermal activation for carbon nanofiber back electrodes was conducted. • An optimum temperature for the activation was found to be 800 °C. • The activation increased the specific capacitance for graphene supercapacitors. • The self-discharging did not worsen, indicating the practicality of this discovery. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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