Scholarlink

<p>The electrochemical performance of activated carbon electrodes in electric double-layer capacitors (EDLCs) is significantly influenced by both the pore structure and the surface chemistry. In this study, activated carbon derived from furan resin, a material that allows for flexible control over nano/mesostructures and particle size, was systematically modified using various oxidants (H<sub>2</sub>O<sub>2</sub>, HNO<sub>3</sub>, KMnO<sub>4</sub>, and mixed acid) to introduce acidic surface functional groups (e.g., phenolic, lactonic, and carboxyl groups). The impact of these groups on wettability, charge transfer resistance, and pseudo-capacitance was investigated. For an activated carbon sample with a surface area of 1,450&#xa0;m<sup>2</sup>/g, KMnO<sub>4</sub> treatment yielded the highest specific capacitance of 201&#xa0;F/g at a current density of 20&#xa0;mA/g, which is a notable improvement over the untreated sample’s capacitance of 111&#xa0;F/g. This enhancement is primarily attributed to a significant increase in carboxyl group content, from 0.56&#xa0;mmol/g in the untreated sample to 1.62&#xa0;mmol/g after KMnO<sub>4</sub> treatment. The introduction of these groups also led to a substantial decrease in charge transfer resistance, demonstrating that carboxyl groups play a major role in enhancing wettability. The results offer insights into how to optimize carbon materials for next-generation EDLC applications by enhancing charge storage mechanisms beyond simple physical adsorption.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Electric Double-Layer Capacitor Properties of Furan Resin-Derived Activated Carbon with Specific Acidic Functional Groups

  • 期刊论文

  • 发表日期：

    2025年11月17日

查看全文
  • Yiliya Aishan,
  • Kanade Hokari,
  • Takeyasu Saito,
  • Naoki Okamoto,
  • Isamu Ide,
  • Masanobu Nishikawa,
  • Yoshikazu Onishi

摘要

The electrochemical performance of activated carbon electrodes in electric double-layer capacitors (EDLCs) is significantly influenced by both the pore structure and the surface chemistry. In this study, activated carbon derived from furan resin, a material that allows for flexible control over nano/mesostructures and particle size, was systematically modified using various oxidants (H2O2, HNO3, KMnO4, and mixed acid) to introduce acidic surface functional groups (e.g., phenolic, lactonic, and carboxyl groups). The impact of these groups on wettability, charge transfer resistance, and pseudo-capacitance was investigated. For an activated carbon sample with a surface area of 1,450 m2/g, KMnO4 treatment yielded the highest specific capacitance of 201 F/g at a current density of 20 mA/g, which is a notable improvement over the untreated sample’s capacitance of 111 F/g. This enhancement is primarily attributed to a significant increase in carboxyl group content, from 0.56 mmol/g in the untreated sample to 1.62 mmol/g after KMnO4 treatment. The introduction of these groups also led to a substantial decrease in charge transfer resistance, demonstrating that carboxyl groups play a major role in enhancing wettability. The results offer insights into how to optimize carbon materials for next-generation EDLC applications by enhancing charge storage mechanisms beyond simple physical adsorption.