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<p>This study investigated the electrochemical performance enhancement of symmetric supercapacitor, having Ni(OH)<sub>2</sub>-activated rice husk carbon (ACRH) nanocomposites (referred to as ARCH-Ni(OH)<sub>2</sub>) as electrodes. ARCH-Ni(OH)<sub>2</sub> were synthesized by incorporating different amount of nanocrystalline nickel hydroxide (Ni(OH)<sub>2</sub>) through a simple one-step hydrothermal method. The obtained ARCH-Ni(OH)<sub>2</sub> featured a hierarchical porous structure with nanocrystalline Ni(OH)<sub>2</sub> on the ACRHs surface, which enhanced charge storage capacity. Electrochemical performance testing in a three-electrode system revealed that the ACRH-Ni(OH)<sub>2</sub>–2 electrode exhibited the highest specific capacitance of 391.30 F/g at a current density of 1 A/g. This outstanding capacitance is attributed to its low series resistance (0.66 Ω) and charge transfer resistance (0.20 Ω). Furthermore, the electrode demonstrated excellent cycling stability, maintaining 96.64% of its initial capacitance after 5000 cycles at a current density of 5 A/g. The fabricated symmetric supercapacitor coin cells of ACRH-Ni(OH)<sub>2</sub>–2//ACRH-Ni(OH)<sub>2</sub>–2 exhibited a high energy density of 22.56 Wh/kg at a power density of 833.49 W/kg and successfully powered a light-emitting diode (LED) for over 1500s, demonstrating its practical applicability. These findings indicate that nanocomposite ACRH-Ni(OH)<sub>2</sub>–2 is a promising electrode material for sustainable energy storage devices.</p>

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One-step hydrothermal synthesis of Ni(OH)2/activated rice husk carbon nanocomposites for electrochemical performance enhancement of symmetric supercapacitor

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • Kwanruthai Wongsaprom,
  • Nattarika Boonraksa,
  • Adulphan Pimsawat,
  • Sujittra Daengsakul,
  • Ekaphan Swatsitang

摘要

This study investigated the electrochemical performance enhancement of symmetric supercapacitor, having Ni(OH)2-activated rice husk carbon (ACRH) nanocomposites (referred to as ARCH-Ni(OH)2) as electrodes. ARCH-Ni(OH)2 were synthesized by incorporating different amount of nanocrystalline nickel hydroxide (Ni(OH)2) through a simple one-step hydrothermal method. The obtained ARCH-Ni(OH)2 featured a hierarchical porous structure with nanocrystalline Ni(OH)2 on the ACRHs surface, which enhanced charge storage capacity. Electrochemical performance testing in a three-electrode system revealed that the ACRH-Ni(OH)2–2 electrode exhibited the highest specific capacitance of 391.30 F/g at a current density of 1 A/g. This outstanding capacitance is attributed to its low series resistance (0.66 Ω) and charge transfer resistance (0.20 Ω). Furthermore, the electrode demonstrated excellent cycling stability, maintaining 96.64% of its initial capacitance after 5000 cycles at a current density of 5 A/g. The fabricated symmetric supercapacitor coin cells of ACRH-Ni(OH)2–2//ACRH-Ni(OH)2–2 exhibited a high energy density of 22.56 Wh/kg at a power density of 833.49 W/kg and successfully powered a light-emitting diode (LED) for over 1500s, demonstrating its practical applicability. These findings indicate that nanocomposite ACRH-Ni(OH)2–2 is a promising electrode material for sustainable energy storage devices.