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Aqueous supercapacitors based on carbonized silk electrodes.

Limei Zhang1, Zhaohui Meng1, Qiaoyun Qi1

  • 1Research Institution for Biomimetics and Soft Matter, Fujian Key Provincial Laboratory for Soft Functional Materials Research, College of Physical Science and Technology, College of Materials, Xiamen University 422 Siming Nan Road Xiamen 361005 P. R. China linnaibo@xmu.edu.cn.

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|May 11, 2022
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Summary
This summary is machine-generated.

Researchers developed nitrogen-doped porous carbon nanosheets from silk for supercapacitors. The material shows excellent capacitance and energy storage, demonstrating a promising green approach for advanced energy devices.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Developing sustainable electrode materials for energy storage is crucial.
  • Hierarchical porous carbon materials offer enhanced electrochemical performance.
  • Silk presents a viable, eco-friendly precursor for advanced carbon materials.

Purpose of the Study:

  • To synthesize graphitic nitrogen-doped hierarchical porous carbon nanosheets from silk.
  • To investigate the effect of heating temperature on material properties and electrochemical performance.
  • To evaluate the supercapacitor performance of the derived carbon material.

Main Methods:

  • Simultaneous activation with ZnCl2 and graphitization with FeCl3 of silk precursor.
  • Varying heating temperatures (700-850 °C) to optimize material characteristics.
  • Fabrication of supercapacitor electrodes and electrochemical performance testing in H2SO4 and Na2SO4 electrolytes.

Main Results:

  • Optimized carbonization at 850 °C yielded high BET surface area (1285.31 m2 g-1) and graphitization degree.
  • Nitrogen doping content was maintained at 2.24 wt%.
  • Supercapacitor exhibited high specific capacitance (178 F g-1 at 0.5 A g-1), excellent rate capability (81% retention at 20 A g-1), and specific energy (14.33 Wh kg-1).

Conclusions:

  • Silk-derived graphitic nitrogen-doped hierarchical porous carbon nanosheets are effective supercapacitor electrode materials.
  • The material demonstrates superior electrochemical performance and energy storage capabilities.
  • This study highlights a sustainable and efficient method for producing advanced carbon materials for energy applications.