Thousandfold Boosting Peak Power Output in Piezoelectric Nanogenerator via Impact Excitation Strategy

ABSTRACT Improving the output power of piezoelectric nanogenerators (PENGs) is currently the most urgent task to promote their practical application toward next‐generation flexible electronics and distributed sensor devices for an environmentally sustainable society. Despite considerable performance progress through sophisticated material design and elaborate structure optimization, the frequency mismatch between mechanical energy sources in natural scenario and the PENG device remains a crucial issue causing low energy conversion efficiency. Herein, we propose a unique mechanical excitation pattern that employs a spring‐induced impact force applied to electrospun flexible BaTiO 3 /PVDF nanocomposite film to maximize the output power of PENG. Compared with the conventional compression mode, this instantaneous stress ejection effectively reduces the force response time from 6.0 to 0.5 ms to achieve frequency up‐conversion, as evidenced by a real‐time synchronized force‐current curve. Moreover, the impact force enhances the separation of positive and negative polarity of the piezoelectric electron cloud and contributes to generating more piezoelectric charges. Consequently, the output current and power density are significantly elevated by 40.0 and 2013.7 times to 1.04 mA cm −2 and 322.2 mW cm −2 , respectively, far surpassing recent reported PENG and triboelectric nanogenerators TENG. Surprisingly, a 16 cm 2 PENG can light up 2000 LEDs and nine bulbs in a record‐breaking, and stable operation with 63 530 cycles. Finally, a wireless temperature and humidity sensing has been successfully demonstrated through PENG's power supply, proving its actual IoT application capability. This study developed a universal and effective impact excitation strategy to enhance the output power of PENG, which is expected to be integrated with more high‐piezoelectric coefficient materials to break through performance bottlenecks in low‐frequency energy harvesting, thereby promoting the practical application of PENG's energy technology.