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Moisture-Light Harvesting Enhanced Hydrovoltaic Electric Generation.

Zelin Lu1, Hongyan Zhu1, Dajing Wang1

  • 1School of Physics, Beihang University, Beijing, 100191, China.

Advanced Materials (Deerfield Beach, Fla.)
|November 5, 2025
PubMed
Summary

Researchers developed a novel moisture-light harvesting electric generator (MLEG) using a composite material. This device efficiently converts atmospheric moisture and light into clean energy, offering a new path for sustainable power.

Keywords:
energy conversionflexible devicehydroelectric power generationlight‐responsive water oxidation

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Area of Science:

  • Materials Science
  • Energy Harvesting
  • Nanotechnology

Background:

  • Moisture-voltaic power generation offers sustainable energy but faces efficiency and adaptability challenges due to environmental complexity.
  • Developing flexible, multimodal clean-energy harvesters is essential to overcome limitations of single-mode conversion.

Purpose of the Study:

  • To create a flexible, multimodal clean-energy harvester by combining hygroscopic materials with light-responsive components.
  • To enhance hydrovoltaic power generation by integrating light harvesting capabilities.

Main Methods:

  • A composite material, PSS/AMPS-Na/PVA/BiOBr (PAPBO), was synthesized for the flexible active layer of the moisture-light harvesting electric generator (MLEG).
  • The MLEG's performance was evaluated under varying humidity levels and light conditions, measuring open-circuit voltage and short-circuit current.
  • The synergistic effect of moisture and light on power output was investigated, focusing on the role of BiOBr in enhancing performance via water oxidation.

Main Results:

  • A single MLEG demonstrated a significant open-circuit voltage of 0.77 V and a short-circuit current of 18.73 µA at 75% relative humidity.
  • Light harvesting by BiOBr generated long-lived holes, enhancing power output by 60.98% (from 72.75 to 117.11 µW cm⁻²) through water oxidation.
  • The device exhibited functionality as a humidity sensor, responding to levels from 10% to 100%.

Conclusions:

  • The developed MLEG effectively harvests both moisture and light energy, significantly boosting the hydrovoltaic effect.
  • This multimodal energy harvesting approach offers a promising new direction for sustainable power generation and environmental sensing.