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Efficient triboelectric generator

14.03.2014

Scientists from the Georgia Institute of Technology announced the creation of an efficient and reliable triboelectric generator.

This device generates electricity by rubbing two surfaces. Until now, the known methods for obtaining triboelectricity were too unreliable. For this reason, most generators today use the principle of magnetic induction.

However, in their study, which the scientists published in Nature Communications, they say that key obstacles to obtaining triboelectricity have been overcome. In the future, this may mean that humanity will receive new inexhaustible sources of electricity: walking (stairs, corridors, sidewalks), rain, wind, dance floors, urban transport, computer keys and many other things and places.

The tribogenerator prototype looks like a thin washer with a diameter of 10 cm. Inside there are two round plates: one of them gives off electrons, and the other accepts. These plates are separated by a dielectric air layer, however, a third intermediate disk with electrodes is also provided, which, during the rotation of the tribogenerator, connect the plates, taking an electric charge. At a maximum rotation speed of 3000 rpm, the device is capable of generating 1,5 watts of electrical power and has a conversion efficiency of 24%, which is three times the capacity of piezoelectric generators and is approximately comparable to the efficiency of traditional generators using the principle of magnetic induction.

However, the tribogenerator today has one significant drawback: gold is used for its electrodes. At the same time, the developers claim that gold can be replaced with cheap synthetic materials.

A new generator, powered by wind or other mechanical forces, could generate "free" electricity, and could be cheaper than generators with rare earth magnets.

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