Cheap triboelectic limestone putty nanogenerator to harvest energy from everyday motion to power small devices

https://phys.org/news/2023-12-limestone-putty-nanogenerator-harvest-energy.html

"only craft-level skill needed... limestone-based mounting putty (tacky. like double-sided adhesive tape) and metallized polyester sheet... extends operational frequency bandwidth up to 80Hz compared to existing <10 Hz TENGs. using triboelectric layers in vibration-based energy-harvester design... future investigation of marble, sandstone and lunar soil based putties... heart monitor implants, biochip transponders for farm animals or sensors that alert a driver when tire pressure is low"

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https://techxplore.com/news/2024-03-harvesting-human-motion-energy-wearable.html

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https://www.electropages.com/blog/2025/06/environmentally-friendly-teng-energy-harvesters-developed

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https://www.tbsnews.net/tech/chinese-scientists-develop-new-device-convert-tire-friction-clean-energy-1174386

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