4.6 Article

Dielectric Manipulated Charge Dynamics in Contact Electrification

期刊

RESEARCH
卷 2022, 期 -, 页码 -

出版社

AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.34133/2022/9862980

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资金

  1. National Natural Science Foundation of China [52103303, 51877132, 52003153]
  2. China Postdoctoral Science Foundation [2021M702089]
  3. Program of Shanghai Academic Research Leader [21XD1401600]
  4. State Key Laboratory of Electrical Insulation and Power Equipment [EIPE20203, EIPE21206]
  5. Science and Technology Project of State Grid [SGSHDK00SPJS2100196]

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This study investigates the contact electrification and charge dynamics on a typical tribomaterial using in situ methods. The results show that the number of transferred electrons increas with contact force/area and tends to reach saturation under increased friction cycles. The incorporation of high permittivity BaTiO3 nanoparticles enhances the capacitance and electron trapping capability of the nanocomposites, improving the output performance of triboelectric devices.
Surface charge density has been demonstrated to be significantly impacted by the dielectric properties of tribomaterials. However, the ambiguous physical mechanism of dielectric manipulated charge behavior still restricts the construction of high-performance tribomaterials. Here, using the atomic force microscopy and Kelvin probe force microscopy, an in situ method was conducted to investigate the contact electrification and charge dynamics on a typical tribomaterial (i.e., BaTiO3/PVDF-TrFE nanocomposite) at nanoscale. Combined with the characterization of triboelectric device at macroscale, it is found that the number of transferred electrons increases with contact force/area and tends to reach saturation under increased friction cycles. The incorporated high permittivity BaTiO3 nanoparticles enhance the capacitance and electron trapping capability of the nanocomposites, efficiently inhibiting the lateral diffusion of electrons and improving the output performance of the triboelectric devices. Exponential decay of the surface potential is observed over monitoring time for all dielectric samples. At high BaTiO3 loadings, more electrons can drift into the bulk and combine with the induced charges on the back electrode, forming a large leakage current and accordingly accelerating the electron dissipation. Hence, the charge trapping/storing and dissipating, as well as the charge attracting properties, should be comprehensively considered in the design of high-performance tribomaterials.

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