Gu Qianfeng, Lu Xiangqian, Chen Cailing, Wang Xiang, Kang Fangyuan, Li Yang Yang, Xu Qingfeng, Lu Jianmei, Han Yu, Qin Wei, Zhang Qichun
Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong SAR, 999077, P. R. China.
School of Physics, State Key Laboratory of Crystal Materials, Shandong University, 27 Shanda South Road, Jinan, Shandong, 250100, P. R. China.
Angew Chem Int Ed Engl. 2024 Sep 23;63(39):e202409708. doi: 10.1002/anie.202409708. Epub 2024 Aug 23.
Organic piezoelectric nanogenerators (PENGs) are attractive in harvesting mechanical energy for various self-powering systems. However, their practical applications are severely restricted by their low output open circuit voltage. To address this issue, herein, we prepared two two-dimensional (2D) covalent organic frameworks (COFs, CityU-13 and CityU-14), functionalized with fluorinated alkyl chains for PENGs. The piezoelectricity of both COFs was evidenced by switchable polarization, characteristic butterfly amplitude loops, phase hysteresis loops, conspicuous surface potentials and high piezoelectric coefficient value (d). The PENGs fabricated with COFs displayed highest output open circuit voltages (60 V for CityU-13 and 50 V for CityU-14) and delivered satisfactory short circuit current with an excellent stability of over 600 seconds. The superior open circuit voltages of CityU-13 and CityU-14 rank in top 1 and 2 among all reported organic materials-based PENGs.
有机压电纳米发电机（PENGs）在为各种自供电系统收集机械能方面具有吸引力。然而，它们的实际应用受到其低输出开路电压的严重限制。为了解决这个问题，在此我们制备了两种二维（2D）共价有机框架（COFs，CityU-13和CityU-14），用氟化烷基链对其进行功能化以用于PENGs。两种COFs的压电性通过可切换极化、特征性的蝴蝶振幅回线、相位滞后回线、明显的表面电位和高压电系数值（d）得以证明。用COFs制造的PENGs显示出最高的输出开路电压（CityU-13为60 V，CityU-14为50 V），并提供了令人满意的短路电流，具有超过600秒的出色稳定性。CityU-13和CityU-14的卓越开路电压在所有已报道的基于有机材料的PENGs中排名第一和第二。
