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Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device

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Published on: July 20, 2021

Interfacial ion-electron conversion enhanced moisture energy harvester.

Puying Li^1,2, Yajie Hu^1,2, Haiyan Wang^1,2

¹State Key Laboratory of Flexible Electronics Technology, Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, PR China.

Nature Communications

|July 17, 2025

Summary

Researchers developed an advanced moisture energy harvester (i-eMEH) that significantly boosts power output. This innovation unlocks the potential of atmospheric moisture for practical, low-carbon energy generation.

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Area of Science:

Materials Science
Energy Harvesting
Environmental Science

Background:

Atmospheric moisture presents a vast, untapped energy resource.
Conventional moisture-electricity generators suffer from low output performance, limiting practical use.
Decentralized energy solutions are crucial for a low-carbon economy.

Purpose of the Study:

To develop a novel moisture energy harvester with significantly enhanced output.
To overcome the limitations of existing moisture-to-electricity conversion technologies.
To demonstrate the potential for practical applications in miniaturized electronics.

Main Methods:

Designed an ion-electron conversion enhanced moisture energy harvester (i-eMEH).
Created an ion-enriched storage interface.
Induced a faradaic process using dual redox couples at interfaces.

Main Results:

Achieved a record peak current of 9.2 mA cm^-2 and power density of 6.7 W m^-2.
Output performance is ~60 times higher than previously reported generators.
Demonstrated efficient charging of a 4F capacitor and a commercial lithium battery.

Conclusions:

The i-eMEH represents a significant advancement in moisture energy harvesting technology.
The device shows potential for powering miniaturized flexible electronics.
This work is a crucial step towards the practical application of atmospheric moisture energy harvesting.