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2D Materials-Based Electrochemical Triboelectric Nanogenerators.

Giuseppina Pace1,2, Antonio Esau Del Rio Castillo3, Alessio Lamperti1

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Advanced Materials (Deerfield Beach, Fla.)
|March 30, 2023
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Summary

Novel triboelectric nanogenerators (TENGs) utilize few-layer graphene electrodes and 2D transition metal dichalcogenide gel electrolytes. This enhances mechanical-to-electrical power conversion, achieving higher output and stability.

Keywords:
2D materialselectrical double-layerselectrochemical capacitancesflexible electronicstriboelectric nanogenerators

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Harvesting

Background:

  • 2D materials enhance triboelectric nanogenerator (TENG) efficiency.
  • They function as triboelectric materials, charge-trapping fillers, or electrodes.
  • Few-layer graphene (FLG) and 2D transition metal dichalcogenides (TMDs) are promising materials.

Purpose of the Study:

  • Develop novel TENGs using FLG electrodes and stable 2D TMD gel electrolytes.
  • Investigate the role of gel composites and electrical double-layer capacitance (EDLC) in power enhancement.
  • Explore strategies for improving TENG performance and stability.

Main Methods:

  • Fabrication of TENGs with FLG electrodes and gel electrolytes (2D TMDs + polyvinyl alcohol).
  • Characterization of TENG performance: open-circuit voltage, peak power, and stability.
  • Analysis of the influence of gel functionalization and wet encapsulation on EDLC and power output.

Main Results:

  • TENGs with FLG and gel composites achieved ≈ 300 V, 530 mW m-2 peak power, and > 11 months stability.
  • A seven-fold increase in electrical output compared to bare FLG electrodes was observed.
  • Enhanced performance was attributed to the high EDLC of FLG electrodes functionalized with gel composites.

Conclusions:

  • Novel TENGs demonstrate significantly improved power conversion efficiency and stability.
  • EDLC of functionalized electrodes is crucial for enhanced performance.
  • This work paves the way for sustainable electrochemical-(e)-TENGs using capacitor strategies.