摩擦电效应
材料科学
电场
电极
电子
电荷密度
极化(电化学)
纳米技术
光电子学
化学物理
复合材料
化学
物理
物理化学
量子力学
作者
Xiaoping Chen,Yina Liu,Yi Sun,Tianshi Zhao,Chun Zhao,Tawfik A. Khattab,Eng Gee Lim,Xuhui Sun,Zhen Wen
出处
期刊:Nano Energy
[Elsevier]
日期:2022-07-01
卷期号:98: 107236-107236
被引量:42
标识
DOI:10.1016/j.nanoen.2022.107236
摘要
As the existence of interfacial electric field, the surface charges of triboelectric nanogenerators (TENGs) would diffuse into air or tribo-material interior, resulting in the charge decay. Therefore, charge regulation from charge storage is crucial in addition to charge generation. In this work, a MXene/TiO2 hybrid film has been prepared through partial oxidation of MXene in a contact-separate mode TENG (MT-TENG) as an intermediate layer between negative tribo-material and bottom electrode. It demonstrates the electric outputs of 128 μC/m2 in charge density, 73.78 μW/cm3 and 63.78 μW/g in average power density with an energy conversion efficiency of 34.81%. The surface terminals in MXene nanosheets and the oxygen vacancies in TiO2 nanoparticles provide abundant electron trap sites. Moreover, the energy band bending resulting from the polarization effect of the hybrid film could further hinder the free electrons' drift to the bottom electrode, and consequently prevent the charge recombination. With the synergetic effect of electron storage and polarization, the MT-TENG with an intermediate layer rapidly reaches a charge dynamic equilibrium with a charge density of 80 μC/m2. It is expected to provide new insights for material science and structure design from the perspective of charge regulation to improve the output performance of TENGs.
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