Intersecting Book Inspired High-Power-Density Electret/Triboelectric Multilayered Power Generator with Flexible Interdigital Electrodes

Abstract

Inspired by the classic friction phenomenon in life, a multi-layer interdigital Electret/Triboelectric Multilayered Power Generator (ET-MPG) that imitates the friction of book pages is designed. Its production is based on a flexible substrate and has special properties that other rigid devices do not have. For example, a very small positive pressure can increase its output performance by 80%, and the final peak power density can reach 0.18W/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . Through exploration experiments, it is known that the number of output peaks of the interdigital electrode has a corresponding relationship with the number of figures, and the output performance can be multiplied. When the sliding rate is 1m/s, the highest peak voltage reaches 30 V, the average output power of a single layer reaches 10 µW, and the power density can reach 54 mW/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> in the preliminary results. In addition, by exploring the influencing factors of the friction between the intersecting books, we can understand the large amount of energy contained in this multi-layer flexible structure. The peak energy density of a single page reaches 2.3 J/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . In addition, the electret generator not only has a high-performance output, but also because it uses all flexible materials, its wearing comfort is unmatched by other rigid devices. This is of great significance to the energy supply of wearable devices and the energy collection on the surface of the human body.