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<p>Because of its abundant availability and potential for carbon conversion, litchi peel has been selected as a biomass carbon precursor. By utilizing a NaCl/ZnCl<sub>2</sub> mixed salt as an activating agent, a series of hierarchical litchi peel porous carbon materials (designated as NZ-LPPC-<i>x</i>-<i>y</i>, where <i>x</i> denotes the mixed salt-to-LP mass ratio, and <i>y</i> signifies the activation temperature) were successfully synthesized. Among them, NZ-LPPC-3-700 exhibited the largest specific surface area (1712.37&#xa0;m<sup>2</sup>&#xa0;g<sup>−1</sup>) and pore volume (0.94&#xa0;cm<sup>3</sup>&#xa0;g<sup>−1</sup>). Electrochemical testing revealed that NZ-LPPC-3-700 demonstrated favorable capacitive performance in 6&#xa0;M KOH electrolyte, achieving high specific capacitance of 254.5&#xa0;F&#xa0;g<sup>−1</sup> at 1&#xa0;A&#xa0;g<sup>−1</sup>, while maintaining a capacitance retention rate close to 78.30% at 20&#xa0;A&#xa0;g<sup>−1</sup>. In a two-electrode system, the NZ-LPPC-3-700//NZ-LPPC-3-700 exhibited low equivalent series resistance and charge transfer resistance, along with energy density of 8.25&#xa0;Wh&#xa0;kg<sup>−1</sup>. Furthermore, it demonstrated remarkable cycling stability, retaining 96.6% of its initial capacitance after 20,000 consecutive charge–discharge cycles 10&#xa0;A&#xa0;g<sup>−1</sup>.</p> Graphical Abstract <p></p>

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Molten Salt-Mediated Porous Carbon Derived From Litchi Peel for High-Performance Supercapacitors

  • 期刊论文

  • 发表日期：

    2025年5月11日

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  • Yuanyuan Wang,
  • Xingshen Dong,
  • Yingjing Xia,
  • Hua Song,
  • Shetian Liu

摘要

Because of its abundant availability and potential for carbon conversion, litchi peel has been selected as a biomass carbon precursor. By utilizing a NaCl/ZnCl2 mixed salt as an activating agent, a series of hierarchical litchi peel porous carbon materials (designated as NZ-LPPC-x-y, where x denotes the mixed salt-to-LP mass ratio, and y signifies the activation temperature) were successfully synthesized. Among them, NZ-LPPC-3-700 exhibited the largest specific surface area (1712.37 m2 g−1) and pore volume (0.94 cm3 g−1). Electrochemical testing revealed that NZ-LPPC-3-700 demonstrated favorable capacitive performance in 6 M KOH electrolyte, achieving high specific capacitance of 254.5 F g−1 at 1 A g−1, while maintaining a capacitance retention rate close to 78.30% at 20 A g−1. In a two-electrode system, the NZ-LPPC-3-700//NZ-LPPC-3-700 exhibited low equivalent series resistance and charge transfer resistance, along with energy density of 8.25 Wh kg−1. Furthermore, it demonstrated remarkable cycling stability, retaining 96.6% of its initial capacitance after 20,000 consecutive charge–discharge cycles 10 A g−1.

Graphical Abstract