Moist-induced electricity generators (MEGs) that harvest electric energy from moisture in the atmosphere show great potential in portable and wearable electronics. Structural properties of active materials are essential for improving the output performance of MEGs. Herein, we developed a novel tree-like structure cellulose acetate (CA) nanofiber membrane by one-step electrospinning of CA solutions added organic branched salt to construct a low-cost, efficient, and wearable MEG. Thanks to the synergistic effects of improved hydrophilicity, increased specific surface area as well as reduced pore size, a single MEG from the optimal CA membrane could generate an output voltage of about 700 mV with a maximum output power density of up to 2.45 μW cm⁻². Interestingly, this MEG can drive electronic calculators by connecting in series and can be used to monitor human respiration due to its high sensitivity to moisture. Such strategy of enhancing the output performance of MEGs based on structural design provides new insights for the development of portable electronic devices.

从大气中的水分中获取电能的湿感应发电机 (MEG) 在便携式和可穿戴电子产品中显示出巨大的潜力。活性材料的结构特性对于提高 MEG 的输出性能至关重要。在此，我们通过一步静电纺丝添加有机支化盐的 CA 溶液开发了一种新型树状结构醋酸纤维素 (CA) 纳米纤维膜，以构建低成本、高效和可穿戴的 MEG。由于改善亲水性、增加比表面积以及减小孔径的协同作用，来自最佳 CA 膜的单个 MEG 可以产生约 700 mV 的输出电压，最大输出功率密度高达 2.45 μW cm ^{- 2}. 有趣的是，这款 MEG 可以通过串联驱动电子计算器，并且由于其对水分的高度敏感性，可用于监测人体呼吸。这种基于结构设计提高 MEG 输出性能的策略为便携式电子设备的开发提供了新的思路。