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Lignin-Based Electrode Materials with a "Spiderweb-Mucilage" Structure for Dual-Energy Storage.

Mengjie Yan1,2,3, Hong Wu1,2,3, Xiaoxuan Weng1,2,3

  • 1School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an 710048, China.

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Summary
This summary is machine-generated.

Researchers developed a flexible lignin-based electrode inspired by spiderwebs for energy storage. This novel material offers high performance for wearable electronics, combining conductivity and energy density.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Growing demand for flexible energy storage in wearable electronics necessitates advanced electrode materials.
  • Existing materials often struggle to balance high energy/power density with flexibility.
  • Need for robust, high-performance electrode materials for next-generation devices.

Purpose of the Study:

  • To develop a flexible, high-performance electrode material for energy storage devices.
  • To mimic the natural spiderweb-mucilage structure for synergistic energy storage.
  • To investigate the electrochemical properties and stability of the novel composite material.

Main Methods:

  • Electrospinning, carbonization, and hydrothermal processes were used to synthesize the lignin-based electrode.
  • A composite structure of reduced graphene oxide-carbon nanofibers (rGO-CNFs) as a conductive skeleton and Nickel Cobalt Layered Double Hydroxides (NiCo-LDHs) nanosheets as active material was created.
  • Characterization included conductivity measurements, contact angle analysis, and electrochemical testing (capacitance, energy density, cycling stability).

Main Results:

  • The rGO-CNFs skeleton provided high conductivity (4.02 S·cm⁻¹) and flexibility, while NiCo-LDHs nanosheets facilitated rapid Faradaic reactions.
  • The composite electrode exhibited a high specific capacitance of 1492.6 F·g⁻¹ at 1 A·g⁻¹, significantly outperforming pure CNFs and rGO-CNFs.
  • Electrolyte wettability was greatly improved (contact angle reduced from 133.3° to 34.4°), enhancing electrochemical performance.
  • The assembled flexible symmetric supercapacitor achieved an energy density of 82.67 Wh·kg⁻¹ and retained 94.5% capacitance after 2000 cycles.

Conclusions:

  • The spiderweb-mucilage-inspired lignin-based electrode material demonstrates excellent performance for flexible energy storage.
  • The synergistic effect between the conductive rGO-CNFs skeleton and NiCo-LDHs nanosheets, coupled with enhanced wettability, drives the superior electrochemical properties.
  • This material holds significant promise for advanced wearable electronics and other flexible energy storage applications.