Piezoelectric Energy Nano-generator with High Conversion Efficiency for Small Body Movements
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초록
내용
Wearable devices for remote medical systems require a reliable power supply to enable full operation during long-term processes. Piezoelectric generators are promising energy sources that use human body movements to generate energy. The wearable device should be able to easily deform with tiny skin deformations to achieve continual energy generation from standard body movements. However, conventional piezoelectric devices cannot deform sufficiently in response to small movements, resulting in an extremely low energy-conversion efficiency when mounted on the human skin. In this study, we report on an ultrathin piezoelectric energy nano-generator (U-PENG) based on PVDF-TrFE. Owing to their thin structure, the proposed U-PENGs conformally adhere to soft human skin and generate energy from eye blinking and breathing. These devices provide energy conversion efficiency of ~18.85 %, which is ~971 % higher than thicker samples, thus can be integrated with biodevices for use as power sources.