July 1, 2025 by National Taiwan University
Collected at: https://techxplore.com/news/2025-07-batteries-required-powered-sensor-energy.html
A new self-powered water sensor uses wave energy to monitor pollutants like heavy metals, microplastics, and pesticides—no battery needed.
Clean water is essential for life—but ensuring it stays clean is a challenge, especially in remote or polluted areas. Researchers have now developed a breakthrough technology: a compact, battery-free water monitoring system that runs on the natural motion of waves.
The innovation integrates two core components. First, a rotational triboelectric nanogenerator (R-TENG) captures energy from water movement, converting it into electricity.
This harvested energy powers a highly sensitive transistor-based sensor made from AlGaN/GaN materials, known for their stability and performance under harsh environmental conditions. The study is published in Nano Energy.
The sensor can detect a variety of harmful substances—including heavy metals (like lead, arsenic, and chromium), pesticides, and even tiny plastic particles—with remarkable precision.
Encased in a waterproof acrylic housing and driven by magnets, the device operates continuously underwater, producing a stable voltage even in high humidity. It charges a small capacitor in about 10 seconds, which then fuels the sensor for real-time measurements.
In lab and river tests, the system demonstrated excellent reliability, distinguishing pollutants down to nanomolar levels and showing a strong linear response to changes in water pH.
Importantly, this self-powered sensor removes the need for batteries or power cables, which often hinder long-term environmental monitoring. By harvesting wave energy, it enables sustainable, long-duration deployment in oceans, rivers, and lakes—supporting both ecological protection and public health.
“This compact, self-powered device offers a smart solution for remote water quality monitoring and early pollution detection,” says Prof. Zong-Hong Lin.
More information: Manish Kumar Sharma et al, Self-powered AlGaN/GaN HEMT-based sensor integrated with rotational TENG for comprehensive water quality analysis, Nano Energy (2025). DOI: 10.1016/j.nanoen.2024.110637
Journal information: Nano Energy
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