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Ionic Hydrogel-Based Moisture Electric Generators for Underwater Electronics.

Daozhi Shen^1,2, Fangzhou Li³, Jian Zhao³

¹School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|September 29, 2024

Summary

Researchers developed a new moisture electric generator (MEG) that harvests energy from underwater environments. This innovation enables self-powered underwater electronics and sustainable energy solutions.

Keywords:

flexibility moist‐electric film generator nanogenerator self‐powered underwater application

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Area of Science:

Materials Science
Energy Harvesting
Environmental Science

Background:

Current moisture electric generators (MEGs) are limited to harvesting energy from atmospheric moisture.
This limitation restricts their efficiency and practical applications in diverse environments.
There is a need for devices capable of harvesting moisture energy in aquatic settings.

Purpose of the Study:

To expand the operational capability of MEGs from air to underwater environments.
To develop a device that can harvest energy from moisture in both terrestrial and aquatic settings.
To demonstrate the potential for self-powered underwater electronics.

Main Methods:

An engineered hydrogel device was created with a waterproof breathable membrane.
This device allows water vapor exchange while preventing liquid water penetration.
The hydrogel's ion separation capabilities were utilized for energy generation.

Main Results:

The device achieved a voltage of 0.55 V and current density of 130 µA cm⁻² in underwater environments.
Consistent performance was observed under challenging conditions, including high salinity, water flow, and hydraulic pressure.
The engineered hydrogel demonstrated self-healing, flexibility, and biocompatibility.

Conclusions:

The developed MEG is the first to demonstrate practical applications in self-powered underwater electronics.
The device successfully powered a wireless emitter for remote underwater communication.
This technology offers a novel approach for harvesting moisture energy underwater, promising advancements in marine Internet-of-Things devices.