Achieving Remarkable Charge Density via Self‐Polarization of Polar High‐k Material in a Charge‐Excitation Triboelectric Nanogenerator. Issue 13 (22nd February 2022)

• Record Type: Journal Article
• Authors: Wu, Huiyuan; He, Wencong; Shan, Chuncai; Wang, Zhao; Fu, Shaoke; Tang, Qian; Guo, Hengyu; Du, Yan; Liu, Wenlin; Hu, Chenguo
• Is Part Of: Advanced materials. Volume 34:Issue 13(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-22
• Subjects: charge density -- charge excitation -- relative permittivity -- self‐polarization -- triboelectric nanogenerators; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202109918
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Boosting output charge density is top priority for achieving high‐performance triboelectric nanogenerators (TENGs). The charge‐excitation strategy is demonstrated to be a superior approach to acquire high output charge density. Meanwhile, the molecular charge behaviors in the dielectric under a strong electric field from high charge density bring new physics that are worth exploring. Here, a rapid self‐polarization effect of a polar dielectric material by the superhigh electric field in a charge‐excitation TENG is reported, by which the permittivity of the polar dielectric material realizes self‐increase to a saturation, and thus enhances the output charge density. Consequently, an ultrahigh charge density of 3.53 mC m −2 is obtained with 7 µm homemade lead zirconate titanate−poly(vinylidene fluoride) composite film in the atmosphere with 5% relative humidity, which is the highest charge density for TENGs with high durability currently. This work provides new guidance for dielectric material optimization under charge excitation to boost the output performance of TENGs toward practical applications. Abstract : Self‐polarization effect is found under charge excitation, which significantly improves the performance of triboelectric nanogenerators (TENGs). This work provides a new strategy to enhance the dielectric properties of polar dielectric materials, and the realization of high charge density provides a promising strategy for achieving high‐output TENGs toward various applications.