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Regenerative Hydrovoltaic Power Generator with Remarkable Duration and Fast Power Generation Achieved by Deep

Haowei Jiang1, Huanhuan Zhang1, Zhikun Gao1

  • 1National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, Department of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510641, China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary

This study introduces a novel biomass-derived hydrovoltaic power generator (HPG) that overcomes limitations of current technologies. The new generator offers both rapid electricity generation and long-term durability without continuous water supply, addressing environmental adaptability and sustainability concerns.

Keywords:
deep eutectic biomass complexfast power generationhydrovoltaic power generatorlong‐term durabilityregenerative

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Biotechnology

Background:

  • Hydrovoltaic power generators (HPGs) are crucial for energy solutions but face challenges with transient output or dependence on continuous water.
  • Existing HPGs exhibit limited environmental adaptability and durability, especially in low humidity, and raise concerns about electronic waste due to recyclability issues.

Purpose of the Study:

  • To develop a sustainable and durable HPG with enhanced environmental adaptability.
  • To overcome the limitations of transient power generation and water dependency in conventional HPGs.
  • To introduce a biomass-derived processing strategy for creating advanced HPGs.

Main Methods:

  • A novel "Deep Eutectic Biomass Complex" (DEBC) was synthesized by combining biomass macromolecules with choline chloride.
  • The DEBC strategy utilized a stable, hydrogen-bonded network to facilitate efficient proton hopping and humidity sensing.
  • Characterization involved assessing electrical output, durability under varying humidity, and long-term stability without external water input.

Main Results:

  • The DEBC demonstrated ultrahigh sensitivity to humidity changes (∆R/R₀≈265,000%) and rapid voltage generation (113.8 ± 11.5 mV s⁻¹).
  • Exceptional durability was observed, maintaining an open-circuit voltage (Voc ≥ 400 mV) at 30% RH for over 10,500 seconds without water input.
  • Sustained Voc was recorded for 25 days in an open environment during winter, highlighting remarkable environmental adaptability.

Conclusions:

  • The developed DEBC offers a feasible approach for creating renewable HPGs with superior durability and environmental adaptability.
  • This biomass-derived strategy effectively tackles the operational limitations and sustainability concerns associated with current HPG technologies.
  • The findings pave the way for next-generation HPGs that are both efficient and environmentally conscious.