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Self-powered rewritable visual indicator for cumulative ionic exposure via hydrovoltaic-Electrophoretic coupling.

Hongli Huang¹, Fulin Xing¹, Yafei Li¹

¹School of Life and Environmental Sciences, Guangxi Colleges and Universities Key Laboratory of Biomedical Sensors and Intelligent Instruments, Guilin University of Electronic Technology, Guilin, Guangxi, 541004, PR China.

Biosensors & Bioelectronics

|June 10, 2026

Summary

This study introduces a self-powered visual indicator that records ionic exposure history. The device uses hydrovoltaic-electrophoretic coupling to create persistent, rewritable spatial signals for environmental monitoring.

Keywords:

Hydrovoltaic effect Ionic transport Visual manifestation Visual transduction

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AC Electrokinetic Phenomena Generated by Microelectrode Structures

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Published on: July 28, 2008

Area of Science:

Materials Science
Environmental Science
Sensing Technology

Background:

Environmental ionic exposure monitoring is limited by instantaneous readouts.
Existing sensing technologies struggle to preserve cumulative exposure data.
There is a need for passive, self-powered devices for long-term environmental monitoring.

Purpose of the Study:

To develop a self-powered, rewritable visual indicator for persistent ionic exposure detection.
To establish a method for converting ionic exposure into a stable spatial signal.
To demonstrate the potential for wearable visual sensing of environmental ionic perturbations.

Main Methods:

Utilized hydrovoltaic-electrophoretic coupling within a graphene oxide hydrogel.
Generated power via evaporation-driven ion transport for electrophoretic particle migration.
Encoded ionic concentration as migration distance for visual readout.

Main Results:

Achieved a hydrovoltaic output up to ~1.1 V, driving particle migration without external power.
Demonstrated continuous expansion of migration distance (~4.7 mm) with increasing ionic concentration.
Confirmed high signal persistence (94.6% after 60 min) and stability over 1000 write-erase cycles.

Conclusions:

The developed indicator effectively converts ionic exposure into persistent, visual spatial signals.
This technology offers a novel strategy for self-powered environmental monitoring and wearable visual sensing.
The platform integrates sensing, energy generation, and readout in a single passive material.