Flexible PET/EVA-based piezoelectret generator for energy harvesting in harsh environments

Stable and repeatable operation is paramount for practical and extensive applications of all energy harvesters. Herein, we develop a new type of flexible piezoelectret generator, which converts mechanical energy into electricity consistently even under harsh environments. Specifically, the generator, with piezoelectric coefficient (d(33)) reaching similar to 6300 pC/N, had worked stably for continuous similar to 90000 cycles, and the generator pressed by a human hand produced load peak current and power up to similar to 29.6 mu A and similar to 0.444 mW, respectively. Moreover, the capability to steadily produce electrical power under extreme moisture and temperature up to 70 degrees C had been achieved for possible applications in wearable devices and flexible electronics.