Abstract
Reciprocating motion is a widely existing form of mechanical motion in the natural environment. Triboelectric nanogenerators (TENGs) that work in sliding mode are ideal for harnessing large-distance reciprocating motion, and their energy conversion efficiency could be greatly enhanced by adding springs to them. Herein, we focused on investigating the design and optimization principles of sliding mode TENGs by analyzing the effects of spring parameters and vibration frequency on the triboelectric output performance of typical cylindrical sliding TENGs (CS-TENGs). Experimental study and finite elemental analysis were carried out based on a CS-TENG model assembled using a polytetrafluoroethylene (PTFE) film as the negative layer and an aluminum film as the positive layer. The energy output was found to be mainly affected by the change of relative displacement between the two friction layers, rather than the reactive force applied by the springs or the velocity of the sliding motion. However, the frequency of the output signals could be improved when the stiffness coefficient of the springs and the CS-TENG vibration frequency were increased. This study provides valuable directions for the design and optimization of sliding mode TENGs containing springs, and will motivate in-depth research on the fundamental principles of TENG operation.
Highlights
Accepted: 14 May 2021The main problem related to the energy crisis is the worldwide growing demand for natural resources to power industrial societies
Two springs were fixed on both ends of the outer tube so that the inner cylinder could be bounced back and forth when the CS-Triboelectric nanogenerators (TENGs) was in operation
Potential simulation results revealed that the film attached to the inner cylinder and the aluminum film stuck to the inner surface of attached to the inner cylinder and the aluminum film stuck to the inner surfacethe of the outer tube was the main cause of the potential difference and the current flow in the external circuit
Summary
Accepted: 14 May 2021The main problem related to the energy crisis is the worldwide growing demand for natural resources to power industrial societies. With the rapid development of portable devices, harnessing environmental mechanical energy by using small devices is recognized as one of the new green energy sources of the era, and has attracted tremendous attention [3,4,5,6,7]. Such devices are usually called energy nanogenerators [8,9]. Nanogenerators based on triboelectric effects have provided a new paradigm for developing cost-effective, high-output, flexible, and durable portable energy harvesters [17]
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