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. 2024 Dec 4;14(52):38416-38425.
doi: 10.1039/d4ra07550a. eCollection 2024 Dec 3.

Augmented triboelectric properties of graphene-filled poly(vinylidene difluoride- co-hexafluoropropylene) (PVDF-HFP) nanofibers

Chen-Hung Lee  1 , Wei-Kang Huang  2 , Meng-Fang Lin  3 , Yi-Hua Kuo  2 , Shih-Jung Liu  2   4 , Hiroshi Ito  5
Affiliations

Augmented triboelectric properties of graphene-filled poly(vinylidene difluoride- co-hexafluoropropylene) (PVDF-HFP) nanofibers

Chen-Hung Lee et al. RSC Adv. .

Abstract

Triboelectric nanogenerators (TENGs) are devices that convert mechanical energy into electrical energy through the triboelectric effect, supplying power to a wide array of advanced sensing and monitoring systems. In this work, we utilized graphene-filled nanofibrous poly(vinylidene difluoride-co-hexafluoropropylene) (PVDF-HFP) as TENGs, employing electrospinning technology. We examined how the dielectric characteristics and transferred charge of the electrification mat affect the output of TENGs. By including graphene nanofillers, the 15 wt% graphene/PVDF-HFP electrospun nanofiber TENG achieved a peak output voltage of 1024 V and a relevant current density of 1.11 μA cm-2. The improved performance of the electrospun graphene/PVDF-HFP nanofibrous TENGs could be attributed to increased interface polarization and enhanced charge transfer, indicating more effective seize and storage of triboelectric electrons. Furthermore, the fabricated TENGs remained stable when tested for over 20 000 cycles and were capable of powering an array of 1000 light-emitting diode bulbs. The electrospun graphene-filled nanofibrous TENGs demonstrated significant potential for collecting mechanical energy and supplying power to electronic devices.

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Conflict of interest statement

The authors declare no conflict of interest regarding the publication of this paper.

Figures

Fig. 1
Fig. 1. Schematically the working mechanism of lab-made TENGs.
Fig. 2
Fig. 2. Microimages of electrospun nanofibers with different contents of graphene.
Fig. 3
Fig. 3. Stress–strain curve of the 15% graphene-filled PVDF-HFP nanofibers.
Fig. 4
Fig. 4. XRD patterns of the PVDF-HFP nanofibers filled with different percentages of graphene.
Fig. 5
Fig. 5. Frequency-dependence of the dielectric constant of graphene/PVDF-HFP nanofibrous mats.
Fig. 6
Fig. 6. Transferred charge of different percentage graphene/PVDF-HFP nanofibrous mats.
Fig. 7
Fig. 7. Maximum output voltage and current density of the nanofibrous TENGs subject to different (A) graphene percentage, (B) applied external force, and (C) operating frequency. (Nanofibrous mats with 15% graphene/PVDF-HFP were used).
Fig. 8
Fig. 8. (A) Output voltage and current density, and (B) power density of TENGs composed of different-weight-percentage graphene filled PVDF-HFP nanofibers.
Fig. 9
Fig. 9. Long-term cycling test of TENGs (operating conditions: 4 Hz, 10 N, 20 000 cycles).
Fig. 10
Fig. 10. Stability of output performance of TENGs for 14 days.
Fig. 11
Fig. 11. The 15 wt% graphene-filled nanofibrous TENGs could power a 1000-LED bulb array.
Fig. 12
Fig. 12. The voltage curves recorded while charging capacitors with various capacitances (0.1, 1, 2.2, 4.7 and 10 μF) using the graphene/PVDF-HFP TENGs.
See this image and copyright information in PMC

References

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