Triboelectric nanogenerators (TENGs) have received much attention due to their potential application in driving portable electronics. Despite the fast development of this technology, improving their performances in a simple manner still remains a great challenge. In this work, a heart-like micro-nanofiber based wearable triboelectric nanogenerator (HMN-TENG) with high performances is demonstrated. The three-dimensional (3D) secondary heart-like structure is designed and self-assembled on an electrospun poly(vinylidene fluoride) (PVDF) fiber based tribonegative layer, and this structure can match the depressed porous and ravine-like structures on the tribopositive layer. The HMN-TENG delivers the voltage, current density and power density outputs of up to 1063 V, 97 mA m⁻² and 14.8 W m⁻², respectively. The high outputs stem from the joint effect between the heart-like structure and the porous structure, which enlarges the effective contact area via their high surface roughness and the “occlusion effect”. Furthermore, the practicability of the HMN-TENG is verified by driving 595 light-emitting diodes (LEDs), a scientific calculator and a timer. The washability is proved by comparing its voltages before and after washing ten times as well as soaking in water for a week. The design offers a solution for performance enhancement of wearable TENGs, and the approach presents a simple and cost-effective technology.

中文翻译：

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由具有心形结构的自组装电纺聚偏二氟乙烯纤维制成的高功率可穿戴摩擦纳米发电机†

摩擦电纳米发电机（TENGs）由于其在驱动便携式电子产品中的潜在应用而受到了广泛的关注。尽管该技术发展迅速，但是以简单的方式改善其性能仍然是一个巨大的挑战。在这项工作中，展示了一种具有高性能的类似心脏的基于微纳米纤维的可穿戴摩擦电纳米发电机（HMN-TENG）。在电纺聚偏二氟乙烯（PVDF）纤维的三负性层上设计并自我组装了三维（3D）次要心形结构，该结构可以与摩擦正切面上的凹陷的多孔和沟壑状结构相匹配层。HMN-TENG可提供高达1063 V，97 mA m ^-2和14.8 W m ^-2的电压，电流密度和功率密度输出， 分别。高输出源于心形结构和多孔结构之间的联合效应，该效应通过其高表面粗糙度和“闭塞效应”扩大了有效接触面积。此外，通过驱动595个发光二极管（LED），科学计算器和计时器，可以验证HMN-TENG的实用性。通过比较其在清洗十次之前和之后的电压以及在水中浸泡一周的时间来证明其可清洗性。该设计为提高可穿戴式TENG的性能提供了解决方案，该方法提出了一种简单且具有成本效益的技术。