Cellulose-based triboelectric nanogenerators (TENGs) can provide power for various monitoring devices and are environmentally friendly and sustainable. Chemical functional modification is a common method to improve the electrical output performance of cellulose-based TENGs. In this work, an environmentally friendly high-performance triboelectric nanogenerator based on a polydopamine/cellulose nanofibril (PDA/CNF) composite membrane and fluorinated ethylene propylene was developed. Dopamine generates polydopamine nanoparticles through oxidative self-polymerization and adheres to the surface of nanofibers. The synergistic effect of amino group introduction and membrane surface microstructure effectively enhanced the output performance of TENGs to a certain extent. The effects of PDA content, CNF composite film thickness and different working conditions on the electrical output were systematically investigated. The optimized PDA/CNF-TENGs exhibited an enhanced electrical output performance with voltage, current, and power density values of ≈205 V, ≈20 µA, and ≈48.75 μW·cm⁻², respectively. The PDA/CNF-TENGs exhibited stable and identifiable signals when used as a self-powered sensor for human motion monitoring, showing the potential prospects of cellulose materials for TENGS and other electronic applications.

Graphical abstract

中文翻译：

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用于自供电人体运动监测的低成本、环保和高性能纤维素基摩擦纳米发电机

基于纤维素的摩擦纳米发电机（TENGs）可以为各种监测设备提供电力，并且是环保和可持续的。化学功能改性是提高纤维素基 TENG 电输出性能的常用方法。在这项工作中，开发了一种基于聚多巴胺/纤维素纳米纤维（PDA/CNF）复合膜和氟化乙烯丙烯的环保型高性能摩擦纳米发电机。多巴胺通过氧化自聚合产生聚多巴胺纳米颗粒并粘附在纳米纤维表面。氨基引入和膜表面微结构的协同作用在一定程度上有效提高了TENGs的输出性能。PDA内容的影响，系统研究了CNF复合膜厚度和不同工况对电输出的影响。优化后的 PDA/CNF-TENG 表现出增强的电输出性能，电压、电流和功率密度值分别为 ≈205 V、≈20 µA 和 ≈48.75 μW·cm^-2，分别。PDA/CNF-TENGs 在用作人体运动监测的自供电传感器时表现出稳定且可识别的信号，显示了纤维素材料在 TENGS 和其他电子应用中的潜在前景。

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