Kirigami‐Based Flexible, High‐Performance Piezoelectric/Triboelectric Hybrid Nanogenerator for Mechanical Energy Harvesting and Multifunctional Self‐Powered Sensing

In recent years, nanogenerators (NGs) have drawn widespread attention from the academic circle as a variety of self‐powered components. Herein, a novel, flexible piezoelectric/triboelectric hybrid nanogenerator based on kirigami (K‐HENG) is first proposed to harvest the human motion energy and serve as a self‐powered strain sensor with high sensitivity. The kirigami‐based electrode allows the device to have excellent tensile properties. By optimizing the electrode structure and simplifying the structure of the device, this K‐HENG can stretch to 100% and collect energy under pressing, stretching, and twisting conditions with higher output than that of a piezoelectric or triboelectric nanogenerator individual. With the assistance of a rectifier to process the circuit, the alternate current generated by K‐HENG can be charged into the capacitor, thus powering microelectronics. In addition, ultrahigh sensitivity makes it applicable in human biological sensing. Therefore, the K‐HENG has massive potential for widespread applications in mechanical energy harvesting and multifunctional self‐powered sensing due to cheap affordability, ease of production, and high performance.