Triboelectric Polymer with High Thermal Charge Stability for Harvesting Energy from 200 °C Flowing Air

• Published in: Advanced functional materials 2021-12, Vol.31 (49), p.n/a
• Main Authors: Tao, Xinglin, Li, Shuyao, Shi, Yuxiang, Wang, Xingling, Tian, Jingwen, Liu, Zhaoqi, Yang, Peng, Chen, Xiangyu, Wang, Zhong Lin
• Format: Article
• Language: English
• Subjects: Barium titanates; Charge density; Electric contacts; Electrification; Energy harvesting; fluorinated polyimide; Flutter; High temperature; Kapton (trademark); Materials science; Motion perception; Nanogenerators; Nanoparticles; Polyimide resins; Polytetrafluoroethylene; Room temperature; Stability; thermal charge stability; Thermionic emission; triboelectric nanogenerator; wind energy; Wind power; Wind speed; Wind tunnels
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.202106082

Due to the thermionic emission effect, the electron transferred to dielectric surface can be released into vacuum after the contact electrification (CE). Therefore, triboelectric nanogenerator (TENG) cannot maintain effective electrical output under high temperature conditions. In order to obtain high thermal charge stability, polyimide is modified with strong electron withdrawing groups like trifluoromethyl (CF3) and sulfone group (SO2) in backbone. The fluorinated polyimides (F‐PI) with a big band gap can provide a tribocharge density of 170 µC m−2 (4 times of common Kapton film) and become more negative than polytetrafluoroethylene in triboelectric series. In addition, BaTiO3 nanoparticles are doped in F‐PI film for inducing deep traps and interfacial polarizations for CE, which can further enhance the charge density (200 µC m−2) and thermal charge stability. Finally, a flutter‐driven TENG (FD‐TENG) is designed based on this BaTiO3‐doped F‐PI film to harvest wind energy and sense wind velocity. This FD‐TENG can maintain 32% of its output performance at 200 °C in comparison with room temperature, which is the highest thermal charge stability reported for triboelectric polymers. Therefore, this BaTiO3‐doped F‐PI has great application prospects for energy generation and motion detection in hot wind tunnel and many other harsh environments. The BaTiO3‐doped fluorinated polyimide film with a big band gap and interfacial deep traps can provide a tribocharge density of 200 µC m−2. A flutter‐driven triboelectric nanogenerator is designed based on this material, which can maintain 32% of its output performance at 200 °C in comparison with room temperature, which is the highest thermal charge stability reported for triboelectric polymers.