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<p>Coal-based active carbon (CAC) is an ideal supercapacitor (SC) electrode material owing to its rich microporosity, high surface area, and excellent capacitance. Taixi anthracite (TXA) features high fixed-carbon content (&lt;8% ash) and a well-ordered microporous structure. This renders TXA critical for CAC-based SC electrodes. For non-biomass SC electrodes, ash content management is critical. In this study, CAC was obtained by physical and chemical sequential activation of TXA using H<sub>2</sub>O and KOH. Ultralow-ash D-CAC was prepared via oxalic acid deashing of CAC, with process conditions optimized. CAC’s extensive porosity enables efficient oxalic acid penetration and deashing. D-CAC demonstrated superior specific capacitance and cycling stability. D-CAC had the largest specific surface area of 2106&#xa0;m<sup>2</sup>/g and a total pore volume of 1.03&#xa0;cm<sup>3</sup>/g. D-CAC also exhibited a high specific capacitance of 339.4&#xa0;F/g at a current density of 0.5&#xa0;A/g. After 10,000 charge and discharge cycles, the specific capacitance showed a 99.1% retention rate. Furthermore, assembled symmetric SC exhibited a high specific capacitance of 156&#xa0;F/g at 0.5&#xa0;A/g and an energy density value of 6.25&#xa0;Wh/kg with a power density of 12,500&#xa0;W/kg. This organic acid (OA) deashing strategy enables the production of high-performance capacitive carbon.</p>

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Preparation of Highly Stable Coal-Based Carbon Capacitor Materials by Physical and Chemical Sequential Activation and Organic Acid Post-deashing Method

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Shanxin Xiong,
  • Qingyong Duan,
  • Fengyan Lv,
  • Yukun Zhang,
  • Hepeng Lu,
  • Nana Yang,
  • Shuai Zhang,
  • Shuaishuai Bai,
  • Xiaoqin Wang,
  • Runlan Zhang,
  • Hong Wang,
  • Zhen Li

摘要

Coal-based active carbon (CAC) is an ideal supercapacitor (SC) electrode material owing to its rich microporosity, high surface area, and excellent capacitance. Taixi anthracite (TXA) features high fixed-carbon content (<8% ash) and a well-ordered microporous structure. This renders TXA critical for CAC-based SC electrodes. For non-biomass SC electrodes, ash content management is critical. In this study, CAC was obtained by physical and chemical sequential activation of TXA using H2O and KOH. Ultralow-ash D-CAC was prepared via oxalic acid deashing of CAC, with process conditions optimized. CAC’s extensive porosity enables efficient oxalic acid penetration and deashing. D-CAC demonstrated superior specific capacitance and cycling stability. D-CAC had the largest specific surface area of 2106 m2/g and a total pore volume of 1.03 cm3/g. D-CAC also exhibited a high specific capacitance of 339.4 F/g at a current density of 0.5 A/g. After 10,000 charge and discharge cycles, the specific capacitance showed a 99.1% retention rate. Furthermore, assembled symmetric SC exhibited a high specific capacitance of 156 F/g at 0.5 A/g and an energy density value of 6.25 Wh/kg with a power density of 12,500 W/kg. This organic acid (OA) deashing strategy enables the production of high-performance capacitive carbon.