The triboelectric nanogenerator (TENG), which converts mechanical energy in the environment into electrical energy, has become a promising energy harvesting technology. However, the traditional TENG is based on the coupling of contact electrification and electrostatic induction to directly generate alternating current (AC), which requires a rectifier to obtain direct current (DC) to drive electronic devices. This greatly limits the portability and energy efficiency of the energy system. In this work, a new type of DC-TENG is designed. Two conductors with different electron-obtaining abilities are selected as TENG electrodes, and the electron-obtaining ability of the triboelectric layer is between the two electrode materials. So, the triboelectric layer can continuously transfer electrons from one electrode to another, realizing a unidirectional flow of electrons. In the experiment, Cu wood and Al were selected to be assembled into a DC-TENG, without a rectifier or air breakdown, and successfully achieved a DC output. The correlation between the motion parameters and the output makes the output continuously adjustable. The rotation mode obtains a constant DC output of 80 V, 270 μA/m², and successfully charges capacitors quickly and illuminates small electronic devices. The electrodes and triboelectric layers of other materials also achieve DC output, which proves the universality of this model.

摩擦纳米发电机（TENG）将环境中的机械能转化为电能，已成为一种很有前途的能量收集技术。然而，传统的TENG是基于接触带电和静电感应的耦合直接产生交流电（AC），需要通过整流器获得直流电（DC）来驱动电子设备。这极大地限制了能源系统的便携性和能效。在这项工作中，设计了一种新型的 DC-TENG。选择两种得电子能力不同的导体作为TENG电极，摩擦电层的得电子能力介于两种电极材料之间。因此，摩擦电层可以不断地将电子从一个电极转移到另一个电极，实现电子的单向流动。实验中，选择Cu木材和Al组装成DC-TENG，无需整流器或空气击穿，成功实现直流输出。运动参数与输出之间的相关性使输出连续可调。旋转模式获得 80 V、270 μA/m 的恒定直流输出²、成功为电容快速充电，照亮小型电子设备。其他材料的电极和摩擦电层也实现了直流输出，证明了该模型的通用性。