A single discharge of the tiny device – inspired by the electric ray fish – can light up more than 1,260 LED bulbs, each rated above three volts, said the team, in a paper published by the peer-reviewed journalThe previous record set by a droplet-based nanogenerator was 237 volts, while a device using an alternative energy source achieved 1,600 volts, the researchers said.
Conventional nanogenerators use displacement current – a virtual phenomenon associated with the generation of magnetic fields by time-varying electric fields – to produce an alternating current . “Every micro-drop corresponds to a cell in the electrical organ of a ray. The power generated by a single cell is relatively low, which is not sufficient for an electric ray to stun prey or defend itself,” he said.
The charges are delivered continuously until the voltage reaches a threshold, when a neural-like controller triggers the discharge process, just like the nervous system of an electric ray. “TC-TENG has an ultra-high output voltage, with unparalleled capability for harvesting high-entropy water energy,” Song said in the paper.
“Using nanogenerators as a power source is still unrealistic, because the energy carried by droplets is limited. But we have more than enough for sensing applications,” Song said.
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