Zhang Binbin, Tian Guo, Xiong Da, Yang Tao, Chun Fengjun, Zhong Shen, Lin Zhiming, Li Wen, Yang Weiqing
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China.
College of Electronic and Information Engineering, Southwest University, Chongqing 400715, China.
Research (Wash D C). 2021 Feb 4;2021:7189376. doi: 10.34133/2021/7189376. eCollection 2021.
Introducing the conductive intermediate layer into a triboelectric nanogenerator (TENG) has been proved as an efficient way to enhance the surface charge density that is attributed to the enhancement of the dielectric permittivity. However, far too little attention has been paid to the companion percolation, another key element to affect the output. Here, the TENG with MXene-embedded polyvinylidene fluoride (PVDF) composite film is fabricated, and the dependence of the output capability on the MXene loading is investigated experimentally and theoretically. Specifically, the surface charge density mainly depends on the dielectric permittivity at lower MXene loadings, and in contrast, the percolation becomes the degrading factor with the further increase of the conductive loadings. At the balance between the dielectric and percolation properties, the surface charge density of the MXene-modified TENG obtained 350% enhancement compared to that with the pure PVDF. This work shed new light on understanding the dielectric and percolation effect in TENG, which renders a universal strategy for the high-performance triboelectronics.
在摩擦电纳米发电机（TENG）中引入导电中间层已被证明是提高表面电荷密度的有效方法，这归因于介电常数的提高。然而，对于影响输出的另一个关键因素——伴随的渗流现象，人们关注得太少了。在此，制备了嵌入MXene的聚偏二氟乙烯（PVDF）复合膜的TENG，并通过实验和理论研究了输出能力对MXene负载量的依赖性。具体而言，在较低的MXene负载量下，表面电荷密度主要取决于介电常数，相反，随着导电负载量的进一步增加，渗流成为性能下降的因素。在介电和渗流性能之间达到平衡时，与纯PVDF相比，MXene改性TENG的表面电荷密度提高了350%。这项工作为理解TENG中的介电和渗流效应提供了新的思路，为高性能摩擦电子学提供了一种通用策略。
