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August 15, 2023 report

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by Bob Yirka , Tech Xplore

A team of mechanical engineers from Chung-Ang University, Massachusetts General Hospital, LS Materials and Yonsei University has found that a hand-held cylinder containing crumpled aluminum foil balls is capable of producing enough electricity when shaken to light a small LED grid. In their paper published in the journal Advanced Science, the group describes other materials used in the cylinder and possible uses for such a device.

Prior research has shown that a wide variety of materials can be used to generate static electricity, and that some constructions can capture that electricity. Researchers have suggested such devices could be useful as the power needs of personal electronics decrease. In this new effort, the researchers have looked to aluminum foil as a material for generating static electricity and capturing it to power an external device.

The device the team built is shaped as a cylinder with a cap on the top and bottom—about the size of a Pringle's can. The tube was made using an acrylic substrate covered with a polytetrafluoroethylene layer. The caps, which serve as electrodes, were made of aluminum. The team then crumpled three wads of aluminum foil into balls and placed them inside the tube.

To create electricity, team members held the tube in one hand and shook it. This caused the aluminum balls to run into each other and to rub against the walls of the cylinder, producing static electricity. That electricity was then passed through the cap, where it was transferred via wires to an external device.

The research team found that the device was capable of producing enough electricity to power a 500-LED light grid and also a 30-watt lamp. Notably, such a device could be attached to another moving device as a way to replace its reliance on hand power—connecting it to a windmill, for example, or a water mill. Such devices could also be used in tandem with other similar devices to increase the amount of electricity generated.

More information: Jin‐ho Son et al, Recycled, Contaminated, Crumpled Aluminum Foil‐Driven Triboelectric Nanogenerator, Advanced Science (2023). DOI: 10.1002/advs.202301609

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