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Freestanding eggshell membrane-based electrodes for high-performance supercapacitors and oxygen evolution reaction.

Jing Geng1, Hao Wu, Abdullah M Al-Enizi

  • 1Laboratory of Advanced Materials, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200433, China. gfzheng@fudan.edu.cn.

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This study showcases novel eggshell membrane electrodes for supercapacitors and oxygen evolution reaction (OER) catalysis. These sustainable electrodes offer high performance and stability, utilizing waste materials for energy applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Eggshell membranes, a readily available waste material, possess unique 3D porous structures.
  • These structures are suitable for developing advanced electrode materials.
  • Utilizing waste for high-value applications aligns with sustainability goals.

Purpose of the Study:

  • To demonstrate a novel freestanding electrode based on eggshell membranes.
  • To evaluate its performance in supercapacitors and as an oxygen evolution reaction (OER) catalyst.
  • To explore the potential of waste-derived materials in energy storage and catalysis.

Main Methods:

  • Fabrication of electrodes by conjugating carbon nanotubes and growing NiCo2O4 nanowire arrays on eggshell membranes.
  • Electrochemical characterization for supercapacitor performance (specific capacitance, cycling stability).
  • Electrochemical evaluation for OER catalysis (onset potential, catalytic current density).

Main Results:

  • The eggshell membrane/carbon nanotube/NiCo2O4 electrode exhibited high specific capacitances and excellent cycling stability (>90% retention over 10,000 cycles) as a supercapacitor.
  • As an OER catalyst, the electrode showed a low onset potential (1.53 V vs. RHE) and stable current density (20 mA cm⁻² at 1.65 V vs. RHE).
  • The 3D framework facilitated efficient charge transport and electrolyte accessibility.

Conclusions:

  • Eggshell membranes can be effectively utilized as a scaffold for high-performance supercapacitor and OER catalyst electrodes.
  • The developed electrode demonstrates promising energy storage and catalytic capabilities.
  • This approach offers a sustainable pathway for creating functional materials from waste.