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<p>Electrode for supercapacitor was successfully synthesized from corncob-derived activated carbon using chemical and thermal activation. This research studied the effect of ZnCl<sub>2</sub> concentration (0.5; 1; and 2&#xa0;M) as a chemical activator. The chemical activation was carried out by reflux system and it was continued by the thermal activation at 600&#xa0;°C under N<sub><i>2</i></sub> flow to generate more pores in the surface of carbon material. The activated carbons were characterized by scanning electron microscopy, Fourier-transform infrared, X-ray diffraction, Thermogravimetric Analysis and N<sub>2</sub> adsorption–desorption isotherm analysis. The electrochemical properties of activated carbon samples were characterized by cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The results showed that the largest capacitance of supercapacitor was 16.66 F.g<sup>−1</sup> obtained from the activated carbon using ZnCl<sub>2</sub> 2&#xa0;M as activation agent. Furthermore, the ZnCl<sub>2</sub>-activated carbon electrode yields cycling durability with 97% capacitance retention after 10000 cycles. This study offers a simple strategy to utilize biomass residue such as corncob into activated carbon for supercapacitor as energy storage application.</p>

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Corncob-derived ZnCl2 activated carbon as a potential electrode for supercapacitor

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Primata Mardina,
  • Rinna Juwita,
  • Meilana Dharma Putra,
  • Hesti Wijayanti,
  • Rowina Lestari,
  • Oktefani Kusuma Rawei,
  • Liza Lestari,
  • Andini Putri Kaisa,
  • Cindy Mutiara Zein

摘要

Electrode for supercapacitor was successfully synthesized from corncob-derived activated carbon using chemical and thermal activation. This research studied the effect of ZnCl2 concentration (0.5; 1; and 2 M) as a chemical activator. The chemical activation was carried out by reflux system and it was continued by the thermal activation at 600 °C under N2 flow to generate more pores in the surface of carbon material. The activated carbons were characterized by scanning electron microscopy, Fourier-transform infrared, X-ray diffraction, Thermogravimetric Analysis and N2 adsorption–desorption isotherm analysis. The electrochemical properties of activated carbon samples were characterized by cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The results showed that the largest capacitance of supercapacitor was 16.66 F.g−1 obtained from the activated carbon using ZnCl2 2 M as activation agent. Furthermore, the ZnCl2-activated carbon electrode yields cycling durability with 97% capacitance retention after 10000 cycles. This study offers a simple strategy to utilize biomass residue such as corncob into activated carbon for supercapacitor as energy storage application.