Improving Relative Permittivity and Suppressing Dielectric Loss of Triboelectric Layers for High-Performance Wearable Electricity Generation

作者：Peng, Zehua; Xiao, Xiao; Song, Jianxin; Libanori, Alberto; Lee, Ching; Chen, Keda; Gao, Yuan; Fang, Yunsheng; Wang, Juan; Wang, Zuankai; Chen, Jun^*; Leung, Michael K. H.^*

来源：ACS Nano, 2022, 16(12): 20251-20262.

DOI：10.1021/acsnano.2c05820

• triboelectric nanogenerator
• carbon-coated silver nanofillers
• relative permittivity
• dielectric loss
• flexibility
• self-powered sensing

High relative permittivity and low dielectric loss are two desired parameters of a triboelectric layer to enhance its mechanical-to-electrical energy conversion efficiency in a triboelectric nanogenerator (TENG). However, the elevated permittivity of the triboelectric layer is always accompanied by increasing dielectric loss, limiting further improvement or even reducing the electrical output. Herein, we report a method for improving the relative permittivity and suppressing the dielectric loss of the triboelectric layer via nanoscale design at the particle-polymer interface. When incorporated with 2 wt % Ag@C, the triboelectric-layer-enhanced TENG (TLE-TENG) presents a 2.6-fold increment in relative permittivity and a 302% current enhancement. An instantaneous peak power density of 1.22 W m(-2), an excellent pressure sensitivity of 90.95 V kPa(-1), and an optimized sheet resistance (similar to 0.14 omega/sq) are attributes of this greatly enhanced device. Such improvements bode well for the implementation of these enhancing strategies to help position TLE-TENGs as pervasive and sustainable power sources and active self-powered sensors in the era of the Internet of Things.