Swing‐Structured Triboelectric–Electromagnetic Hybridized Nanogenerator for Breeze Wind Energy Harvesting

Abstract

Wind energy is one of the most promising renewable energy sources, but harvesting low frequency breeze wind energy is hardly achieved using traditional electromagnetic generators (EMGs). Triboelectric nanogenerators (TENGs) provide a new approach for large‐scale collection of distributed breeze wind energy (usually 3.4–5.4 m s−1). Herein, by coupling the TENG and EMG, a swing‐structured hybrid nanogenerator with improved performance and durability is designed. The dielectric brush and air gap designs can minimize the material wear and continuously supply the tribo‐charges. Under external triggering, systematic comparisons are made about the output characteristics of TENG and EMG. The rectified peak power and average power of TENG are respectively, 60 and 635 times higher than those of EMG at moderate coil turn numbers, showing that TENG is much more effective than EMG for harvesting low‐frequency distributed energy (high entropy energy). Furthermore, the hybrid nanogenerator and array device are hung on tree branches to demonstrate the effective harvesting of breeze wind energy, delivering total rectified peak power densities of 2.07 and 1.94 W m–3 for single and array devices, respectively. The applications of powering portable electronics reveal the huge prospects of hybrid nanogenerator in self‐powered environmental monitoring toward forest/park fire warning systems.

A High Output Triboelectric–Electromagnetic Hybrid Generator Based on In‐Phase Parallel Connection

“…[1,[28][29][30][31][32] The rotating TENG is the most suitable device for harvesting energy because its voltage is largely independent of the rotational speed and the current is proportional to the rotational speed, which is a great advantage for powering external loads. [5,[33][34][35][36][37][38][39][40][41][42] Lin et al [36] designed a long-lived and robust rotating TENG that greatly reduces frictional losses, but has the disadvantage of low output. Bai et al [33] proposed a TENG-based charge pump strategy with a peak power of 658 mW at a frequency of 2 Hz, but the prerequisite is that an external voltage source is required for pre-charging to excite the charge.…”

“…[ 1,28–32 ] The rotating TENG is the most suitable device for harvesting energy because its voltage is largely independent of the rotational speed and the current is proportional to the rotational speed, which is a great advantage for powering external loads. [ 5,33–42 ] Lin et al. [ 36 ] designed a long‐lived and robust rotating TENG that greatly reduces frictional losses, but has the disadvantage of low output.…”

Enhanced galloping energy harvester with cooperative mode of vibration and collision

“…Aiming to harvest weak energy from environment, a hybridized wind energy harvester with the TENG and EMEH composite mechanism was designed by Zhao et al [22] to realize selfpowered electronic equipment. Lu et al [23] designed a swing-structured hybrid nanogenerator with a triboelectric-electromagnetic compound mechanism, which can harvest low-frequency breeze in the environment. Rahman et al [24] designed a hybridized nanogenerator based on three electromechanical conversion mechanisms, and realized power supply for wireless sensors in real-time environmental monitoring.…”

A Novel Triboelectric Material Based on Deciduous Leaf for Energy Harvesting

“…As we all know, friction motion widely exists in the environment; therefore, TENG's acquisition of friction mechanical energy is widespread. Through a simple power generation device design and friction movement, TENG can collect almost all mechanical energy, such as wind energy, water drop energy, wave energy, human motion energy, and other mechanical energy, and convert it into electrical energy [13][14][15][16][17][18][19][20][21].…”