Self-Boosting Energy Generation via Triboelectric Nanogenerator-Capacitor Coupling

Abstract

With the development of wearable and wireless electronic devices, the triboelectric nanogenerator (TENG) is attracting interest as a candidate for portable power. Many studies are conducted to increase the surface charge density of the TENG, such as external charge pumping or external electron excitation strategies. However, there are limitations in that another additional external energy source is required. Here, a TENG-capacitor (TC) coupling system that can maximize energy generation and storage efficiency within a limited volume is proposed. Density functional theory calculations indicate that the electric field induced on capacitor increases the fermi energy of positive triboelectric material, resulting in more charge transfer between two triboelectric materials. TC coupling system enhances TENG output performance and the capacitor charging rate in a virtuous cycle. This study provides new insights into TENG structural design and an important guideline for the use of TENG as a portable power source for wearable and wireless applications. Triboelectric nanogenerator (TENG)-capacitor coupling system capable of achieving higher energy generation and storage efficiency is demonstrated. The electrode pattern design of TENG and capacitor induces an electric field on the capacitor electrode, leading to higher surface charge density in the triboelectric layer. This study provides important guidelines for using TENGs as power sources for wearable and wireless applications. image