Contact-mode triboelectric nanogenerators (TENGs) generally operate as a floating source with its two electrodes connected to an arbitrary external circuit forming a closed loop. In this work, a switch based contact-mode TENG (SW-TENG) is presented, wherein a switch is placed between a TENG electrode and an external circuit. By electrically isolating the TENG from the external circuit when the switch is open, charge leakage is prevented and the output performance of the TENG is enhanced while the transferred tribocharges per cycle remain the same. Effect of different switching frequencies while keeping the contact-separation frequency (f_cs) and contact force constant at 1 Hz and 0.5 kgf, respectively, is presented. The versatility of the approach is presented via demonstrating the switching effect in three TENGs fabricated using different types of dielectric films – (a) bare polydimethylsiloxane (PDMS), (b) microdome patterned PDMS, and (c) PDMS-Carbon nanofiber (CNF) composite. When the switching frequency (f_sw) is in sync with f_cs, the output voltage is increased by a factor of up to 22, 17, and 90, in SW-TENGs made using samples (a), (b), and (c), respectively, compared to that obtained under typical TENG operation. In a 1 μF capacitor charging experiment, it has been shown that synchronous switching can prevent a charge leakage of up to approximately 60%. Further, a maximum area power density of 3.4 W cm⁻², 20 W cm⁻², and 31.7 W cm⁻² is achieved at an external load resistance of 56 Ω, in SW-TENGs made using samples (a), (b), and (c), respectively. Compared with a typical TENG, the optimal load resistance is decreased by six orders of magnitude, from megaohms to ohms. The SW-TENG thus provides a new approach for mechanical energy harvesting.

接触式摩擦电纳米发电机（TENG）通常用作浮动源，其两个电极连接到形成闭环的任意外部电路。在这项工作中，提出了一种基于开关的接触模式TENG（SW-TENG），其中在TENG电极和外部电路之间放置了一个开关。通过在开关断开时将TENG与外部电路电气隔离，可以防止电荷泄漏，并提高TENG的输出性能，同时每个周期传输的摩擦电荷保持不变。在保持触点分离频率（f _cs）的同时，不同开关频率的影响），并给出了分别为1 Hz和0.5 kgf的接触力常数。通过演示使用不同类型的介电膜制造的三种TENG中的开关效果来展示该方法的多功能性-（a）裸聚二甲基硅氧烷（PDMS），（b）微型穹顶图案化PDMS和（c）PDMS-碳纳米纤维（CNF）合成的。当开关频率（f _sw）与f _cs同步时与典型的TENG操作相比，分别使用样本（a），（b）和（c）制作的SW-TENG中，输出电压最多增加22、17和90倍。在1μF的电容器充电实验中，已经证明，同步开关可以防止高达60％的电荷泄漏。此外，3.4厘米的最大面积的功率密度^-2，20瓦厘米^-2，和31.7W¯¯厘米^-2在56Ω的外部负载电阻来实现，在SW-腾的使用样本（A），（B制成）和（c）。与典型的TENG相比，最佳的负载电阻降低了六个数量级，从兆欧到欧姆。因此，SW-TENG为机械能的收集提供了一种新方法。