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Cellulose aerogel-based copper oxide/carbon composite for supercapacitor electrode.

Yu Qian1, Xinye Sun1, Xinyue Deng1

  • 1School of Chemical Engineering, Sichuan University Chengdu 610065 China zhangtao@scu.edu.cn.

RSC Advances
|March 4, 2025
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Summary

Researchers developed copper oxide/carbon composites from cellulose aerogels for supercapacitors. This advanced electrode material significantly boosts energy density and retains capacitance, addressing key challenges in energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Carbon composites are promising electrode materials for supercapacitors.
  • Improving the energy density of supercapacitors remains a critical challenge.
  • High specific surface area materials are essential for enhanced electrochemical performance.

Purpose of the Study:

  • To synthesize novel copper oxide/carbon composites for supercapacitor applications.
  • To enhance the energy density and capacitance retention of electrode materials.
  • To investigate the performance of these composites in asymmetric supercapacitors.

Main Methods:

  • Preparation of copper oxide/carbon composites using cellulose aerogel loaded with copper salts (copper sulfate).
  • Characterization of the composite material's specific surface area and electrochemical properties.
  • Assembly and testing of an asymmetric supercapacitor using the composite as the positive electrode.

Main Results:

  • The copper oxide/carbon composite electrode achieved a specific capacitance of 1001 F g-1 at 2 A g-1.
  • A high energy density of 139.0 W h kg-1 was recorded.
  • Excellent capacitance retention of 98.06% after 500 cycles was demonstrated.

Conclusions:

  • The developed copper oxide/carbon composite is a highly effective electrode material for supercapacitors.
  • The material offers a viable solution for increasing supercapacitor energy density and stability.
  • The asymmetric supercapacitor demonstrated good performance with a specific capacitance of 125 F g-1 at 0.1 A g-1.