Bipolar Co-Injection Floating Rotary Triboelectric Nanogenerator for Wind Energy Harvesting

Charge excitation is a key method to enhance the output of floating rotary triboelectric nanogenerator (FR-TENG). However, most current research focuses on improving the surface charge density of a single material, neglecting the strategy of simultaneously increasing the surface charge density of two materials with opposite polarities to enhance the potential difference. Here, we propose a method of coinjecting positive and negative charges using a voltage-multiplying circuit (VMC), applied to a floating self-excited rotary TENG (FSR-TENG). The VMC injects positive and negative charges into two adjacent, nonconductive electrode groups on the stator. This increases the potential difference between the two electrode groups, thereby effectively enhancing the device's output. Compared to FR-TENG, the current and transferred charge increase by 341% and 421%, respectively. This work provides an innovative strategy for maximizing the output of rotational TENGs and can be easily applied to other types of TENGs.