In this work, for the first time, we combine electronic printing technology, electrostatic spraying technology and the new 3D structure of ZnO. The new structure was prepared with a simple, low-cost and massive method that was not successfully applied before. The ZnO tetrapods/PET composite device exhibits an output open-circuit voltage of~20 V and a short-circuit current of 300nA under repeated hand pressing. It is demonstrated that the output power from the PENG can directly drive the light-emitting diodes (LEDs) and charge a capacitor. But a typical flexible polymer produces an output voltage of 3.3 V and cannot power light-emitting diodes.