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Boosting the Charge Output of Enclosed Liquid-Based Nanogenerators by Electrowetting-Assisted Charge Injection

Ye Zhao1, Leiyang Wang1, Guo Li1

  • 1School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510641, China.

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Summary

This study introduces an electrowetting-assisted charge injection (EWCI) method to boost the performance of enclosed liquid-based nanogenerators (L-NGs). The novel approach significantly enhances charge density and ensures long-term stability for clean energy applications.

Keywords:
electrowettingenergy harvestingnanogeneratorsolid‐liquid interfacesurface charges

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Area of Science:

  • Energy Harvesting
  • Materials Science
  • Triboelectric Nanogenerators

Background:

  • Liquid-based nanogenerators (L-NGs) offer clean energy solutions with low friction.
  • Enclosed L-NGs provide durability but suffer from low charge density due to triboelectrification.
  • Improving charge output is critical for practical applications of enclosed L-NGs.

Purpose of the Study:

  • To enhance the charge output of enclosed liquid-based nanogenerators.
  • To address the challenge of low charge density at the liquid-solid interface.
  • To develop a robust and versatile energy harvesting device.

Main Methods:

  • Electrowetting-assisted charge injection (EWCI) was employed to treat enclosed L-NGs.
  • The charge density and retention capabilities of the modified nanogenerators were evaluated.
  • Device performance was tested under intermittent operation for six months.

Main Results:

  • EWCI treatment increased charge density approximately ninefold, reaching 19.1 mC m-3.
  • The electrowetting-assisted charge injection (EWCI) method ensured stable charge retention, showing no degradation over six months.
  • The enhanced nanogenerator (EW-NG) successfully powered a 10-inch LCD screen.

Conclusions:

  • EWCI is an effective method for significantly enhancing the charge output and robustness of enclosed L-NGs.
  • The developed EW-NG demonstrates potential for diverse mechanical energy harvesting.
  • This technology is promising for self-powered systems in the Internet of Things.