Abstract
We are reporting on the conversion of gas/air flow energy in pipes to electrical signals using the triboelectric effect. A flapping triboelectric generator design with all freestanding flexible films is introduced in this regard. The generator can be integrated within a regular pipe infrastructure, as it is independent of the pipe material, for implementing the triboelectric effect. All flexible materials are used to develop the triboelectric generator, utilizing a simple fabrication process that is easily scalable. The performance of the triboelectric device was influenced by several physical parameters, as well as by the gas flow speed, which has been optimized here for a pipe diameter of 5 cm. The triboelectric generator implementing a flexible silver material in combination with polytetrafluoroethylene (PTFE) exhibits 100% higher optimum average power output compared to a generator made of PTFE and polyurethane. A harvester unit with two pairs of triboelectric films with an active film area of 5 × 3.3 cm2 with 6 mm gaps was demonstrated. The device produced total average power of 1.64 mW across an optimum load resistance of 16.7 MΩ under the air flow speed of 9.8 ± 0.2 m s−1.
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