High‐Performance Constant Current Triboelectric Nanogenerator for Wind Energy Harvesting and Air Purification

ABSTRACT Effective wind energy harvesting represents a viable solution to the global energy shortage and environmental pollution. Triboelectric nanogenerators (TENGs) hold great potential in wind energy harvesting; yet, there is little research on constant current TENGs for this purpose. Herein, a novel rotary bicharacteristic current TENG (R‐BC‐TENG) with constant current output for ambient wind energy harvesting is proposed, which delivers a low crest factor of 1.0187. Through the synergistic integration of triboelectrification, electrostatic discharge, and electrostatic induction, an average power density of 2.4 W m −2 Hz −1 and a charge density of 1.86 mC m −2 for the R‐BC‐TENG are achieved, with the charge density surpassing that reported in most previous studies. The minimum starting wind speed of R‐BC‐TENG is as low as 2.8 m s −1 while maintaining 100% performance after 12,700 cycles. Moreover, a self‐powered air purification system, based on the R‐BC‐TENG, is developed, with the ability to generate 1,400,000 ions cm −3 and settle dust within 50 s. This work provides a paradigm for harvesting wind energy to achieve constant current output as well as safe and efficient air purification.