Electrospun liquid metal/PVDF-HFP nanofiber membranes with exceptional triboelectric performance. (February 2022)

• Record Type: Journal Article
• Authors: Sha, Zhao; Boyer, Cyrille; Li, Guang; Yu, Yuyan; Allioux, Francois-Marie; Kalantar-Zadeh, Kourosh; Wang, Chun-Hui; Zhang, Jin
• Is Part Of: Nano energy. Volume 92(2022)
• Publication Date: 2022-02
• Subjects: Triboelectric nanogenerator -- Liquid metal -- Electrospinning -- Nanofiber membrane -- Electrical output; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2021.106713
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Flexible triboelectric nanogenerators (TENGs) are sustainable energy sources to power a diverse range of intelligent sensing and monitoring devices and poly(vinylidene fluoride) (PVDF) is a common polymer incorporated in TENGs. To further enhance the electrical outputs of PVDF based TENGs, herein we present a technique for introducing liquid metal (LM) Galinstan nanodroplets into electrospun PVDF- co -hexafluoropropylene (PVDF-HFP) nanofibers to enhance their triboelectric performance. Using the PVDF-HFP/2%LM nanofiber membrane as the negative tribo-layer and thermoplastic polyurethane as the positive tribo-layer, the peak open-circuit voltage and power density of the resultant TENG reached 1680 V and 24 W/m 2, respectively, which are significantly higher than previous state-of-art values of existing PVDF based TENGs. This outstanding performance is attributed to multiple factors, including the improved surface potential, capacitance, charge trapping capability, and the secondary polarization inside PVDF-HFP nanofiber by the introduced LM nanodroplets. With the mechanical properties of PVDF-HFP nanofiber membranes weakened slightly after the increase of the LM content, the PVDF-HFP incorporating 2% LM showed the highest multifunctionality efficiency of mechanical performance and electrical generation. The LM modified PVDF-HFP nanofiber membranes can be promising materials in high performance TENGs as the negative tribo-layer. Graphical Abstract: ga1 Highlights: Electrospun PVDF-HFP/Galinstan nanofiber membrane is a promising tribo-negative layer for constructing TENG. Exceptional triboelectric performance was shown in the TENG with PVDF-HFP/2%LM nanofiber layer. The peak open-circuit voltage and power density of this TENG reached 1680 V and 24 W/m 2, respectively. This TENG showed good multifunctionality efficiency.