Shi Xingxing, Si Wanjie, Zhu Jingyi, Zhang Shuidong
The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong, 518033, China.
Institute of Emergent Elastomers, South China University of Technology, Guangzhou, Guangdong, 510640, China.
Small. 2024 Apr;20(15):e2307620. doi: 10.1002/smll.202307620. Epub 2023 Nov 27.
Triboelectric nanogenerators (TENGs) have emerged as a promising technology for harvesting mechanical energy from the ambient environment. However, developing tribopositive materials with strong piezoelectric effects and high electron-donating ability still remains a challenge. Herein, poly(ethylene glycol) monomethyl ether (mPEG) to soft poly(lactic acid) (PLA) is adopted, then PLA/mPEG nanofibers are fabricated under electrospinning and used as the tribopositive material for fabricating robust power density TENGs. The crystallinity and dynamic mechanical properties of PLA/mPEG nanofibers are investigated. The results revealed that the incorporation of mPEG provided an effective approach to elevate the electron-donating ability and charge transfer efficiency in PLA. The PLA/mPEG-based TENGs achieved a high open-circuit voltage of 342.8 V, a short-circuit current of 38.5 µA, and a maximum power density of 116.21 W m over a 2 cm contact area at an external load of 10 Ω, respectively. Strikingly, excellent stability and durability are demonstrated after continuous cycles up to 10 cycles. Noteworthy, the TENGs are explored for self-powered sensing applications, with seven TENG units integrated to act as self-powered sensors playing music through buzzers when pressed by fingers. Eventually, this work provides new insights into tuning the structures and properties of electrospun polymers to reinforce the TENG output and self-powered systems.
摩擦电纳米发电机（TENGs）已成为一种从周围环境中收集机械能的有前途的技术。然而，开发具有强压电效应和高给电子能力的摩擦正性材料仍然是一个挑战。在此，采用聚乙二醇单甲醚（mPEG）与软质聚乳酸（PLA），然后通过静电纺丝制备PLA/mPEG纳米纤维，并将其用作制造具有高功率密度的TENGs的摩擦正性材料。研究了PLA/mPEG纳米纤维的结晶度和动态力学性能。结果表明，mPEG的加入为提高PLA中的给电子能力和电荷转移效率提供了一种有效方法。基于PLA/mPEG的TENGs在10Ω的外部负载下，在2cm的接触面积上分别实现了342.8V的高开路电压、38.5µA的短路电流和116.21W/m²的最大功率密度。令人惊讶的是，在连续循环高达10000次后仍表现出优异的稳定性和耐久性。值得注意的是，该TENGs被用于自供电传感应用，七个TENG单元集成在一起用作自供电传感器，当被手指按压时通过蜂鸣器播放音乐。最终，这项工作为调整静电纺丝聚合物的结构和性能以增强TENG输出和自供电系统提供了新的见解。
