Scholarlink

<p>This study presents the fabrication of carbon quantum dots–polypyrrole/nanoporous gold (CQDs–PPy/NPG) composite electrodes via ultrasound-assisted electrodeposition (UAED) for high-performance supercapacitors. Structural characterizations confirmed that ultrasonic power of 150 W yielded a uniform surface morphology, enhanced elemental dispersion, and a well-integrated CQDs-PPy framework. The optimized electrode exhibited superior mechanical properties with an elastic modulus of 3.92&#xa0;GPa, yield strength of 215.41&#xa0;MPa, and fracture strain of 13.85%. Electrochemical testing revealed a high specific capacitance of 673.6&#xa0;F/g at 10&#xa0;mV/s, with 93.1% rate capability at 100&#xa0;mV/s. At a current density of 5&#xa0;A/g, the electrode retained a coulombic efficiency of 96.8% and delivered an energy density of 513.7&#xa0;Wh/kg at a power density of 5 W/kg. After 20,000 cycles, it maintained 94.2% capacitance retention and 81.2% coulombic efficiency, demonstrating excellent cycling stability. The assembled asymmetric supercapacitor (CQDs-PPy/NPG//AC) achieved 42.8&#xa0;Wh/kg at 2000&#xa0;W/kg, outperforming many reported counterparts. These results highlight the synergistic effect of CQDs, PPy, and NPG, and the effectiveness of UAED in tailoring high-performance supercapacitor electrodes.</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

Preparation of Carbon Quantum Dots-Polypyrrole/Nanoporous Gold Composite Electrode and Its Application in Supercapacitors

  • 期刊论文

  • 发表日期：

    2025年7月3日

查看全文
  • Jinfang Yue

摘要

This study presents the fabrication of carbon quantum dots–polypyrrole/nanoporous gold (CQDs–PPy/NPG) composite electrodes via ultrasound-assisted electrodeposition (UAED) for high-performance supercapacitors. Structural characterizations confirmed that ultrasonic power of 150 W yielded a uniform surface morphology, enhanced elemental dispersion, and a well-integrated CQDs-PPy framework. The optimized electrode exhibited superior mechanical properties with an elastic modulus of 3.92 GPa, yield strength of 215.41 MPa, and fracture strain of 13.85%. Electrochemical testing revealed a high specific capacitance of 673.6 F/g at 10 mV/s, with 93.1% rate capability at 100 mV/s. At a current density of 5 A/g, the electrode retained a coulombic efficiency of 96.8% and delivered an energy density of 513.7 Wh/kg at a power density of 5 W/kg. After 20,000 cycles, it maintained 94.2% capacitance retention and 81.2% coulombic efficiency, demonstrating excellent cycling stability. The assembled asymmetric supercapacitor (CQDs-PPy/NPG//AC) achieved 42.8 Wh/kg at 2000 W/kg, outperforming many reported counterparts. These results highlight the synergistic effect of CQDs, PPy, and NPG, and the effectiveness of UAED in tailoring high-performance supercapacitor electrodes.