Surface polarity tuning through epitaxial growth on polyvinylidene fluoride membranes for enhanced performance of liquid-solid triboelectric nanogenerator

Vu, Duy Linh; Le, Chau Duy; Vo, Cong Phat; Ahn, Kyoung Kwan

doi:10.1016/j.compositesb.2021.109135

Cited by 39 publications

(31 citation statements)

References 51 publications

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“…Like the previous works, polarization, hydrophobic properties, and dielectric constant are the main factor influencing the triboelectrification between the water droplet and solid 20,39,40 . The transferred charge density (

normalσ ’

) in the TENG device could be presented as follows 23 :

\begin{matrix} true \\ σ ’ = \frac{{normalσ}_{0} d_{italicgap}}{d_{italicgap} + d_{m} / ε_{m}} \end{matrix}

where

d_{m}

ε_{m}

refer to the membrane thickness and dielectric constant of the triboelectric membrane,

d_{gap}

to the gap distance and

σ_{0}

to the charge density at the equilibrium state.…”

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

“…Polyvinylidene fluoride (PVDF) has been widely employed as an efficient triboelectric material for liquidsolid TENG systems owing to its large negative polarity and outstanding mechanical properties. [20][21][22] PVDF has the simplest repeat unit based on the arrangement of CF2-CH2 monomers, resulting in its polymorphism, generally α, β, γ, and ε. The polar crystalline phase (β phase) is among them, and it has an all-trans configuration, with fluorine and hydrogen atoms aligned in opposite orientations.…”

Section: Introductionmentioning

confidence: 99%

“…Polyvinylidene fluoride (PVDF) has been widely employed as an efficient triboelectric material for liquid‐solid TENG systems owing to its large negative polarity and outstanding mechanical properties 20‐22 . PVDF has the simplest repeat unit based on the arrangement of CF2‐CH2 monomers, resulting in its polymorphism, generally α, β, γ, and ε.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Functionalized graphene oxide/polyvinylidene fluoride composite membrane acting as a triboelectric layer for hydropower energy harvesting

Ahn

2022

Intl J of Energy Research

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Liquid-solid triboelectric nanogenerator (TENG) has received much attention as a promising electricity generation mechanism for renewable energy sources and self-powered electronic devices. Thus, enhancing TENG performance is a critical issue to be concerned for both practical and industrial applications.Hence, in this study, for the first time, the liquid-solid TENG based on functionalized graphene oxide (F-GO) and polyvinylidene fluoride (PVDF) composite membranes containing various F-GO concentrations were fabricated using the blade coating process. The surface of GO nanosheets was functionalized through covalent graft by using 1H,1H,2H,2H-perfluorooctyltriethoxysilane (FOTS). As indicated in FE-SEM images, the miscibility of the F-GO containing fluorine group in PVDF was effectively improved, which was created favorable conditions for PVDF crystallization and β phase configuration. Thus, the dielectric and polarization characteristics of the F-GO/PVDF membranes were greatly improved, eventuating in a rise in the output performance of F-GO/PVDF-based TENG. As a consequence, the F-GO/PVDF TENG generates 0.14 mW of output power from a single water droplet, which is 7 times more than PVDF TENG and 1.8 times higher than GO/PVDF TENG. It is proved the addition of functionalized GO nanosheets in PVDF is very effective for hydropower energy harvesting based on liquid-solid TENG.

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normalσ ’

) in the TENG device could be presented as follows 23 :

\begin{matrix} true \\ σ ’ = \frac{{normalσ}_{0} d_{italicgap}}{d_{italicgap} + d_{m} / ε_{m}} \end{matrix}

where

d_{m}

ε_{m}

refer to the membrane thickness and dielectric constant of the triboelectric membrane,

d_{gap}

to the gap distance and

σ_{0}

to the charge density at the equilibrium state.…”

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Functionalized graphene oxide/polyvinylidene fluoride composite membrane acting as a triboelectric layer for hydropower energy harvesting

Ahn

2022

Intl J of Energy Research

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“…In this study, the surface polarization enhancement of PSPE film is mainly due to the increase of the fluorine functional group, which is related to the dielectric constant and surface energy of the solid [ 37 , 39 , 40 ]. Figure 3 a,b presents the dielectric constant and dielectric loss of PVDF and PSPE films as frequency-dependent at room temperature.…”

Section: Resultsmentioning

confidence: 99%

Polyvinylidene Fluoride Surface Polarization Enhancement for Liquid-Solid Triboelectric Nanogenerator and Its Application

Ahn

2022

Polymers

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Liquid-solid triboelectric nanogenerator (TENG) has been great attention as a promising electricity generation method for renewable energy sources and self-powered electronic devices. Thus, enhancing TENG performance is a critical issue to be concerned for both practical and industrial applications. Hence in this study, a high-output liquid-solid TENG is proposed using a polyvinylidene fluoride surface polarization enhancement (PSPE) for self-powered streamflow sensing, which shows many advantages, such as adapt to the sensor energy requirement, multiple parameters sensing at the same time, eliminate the influence of ion concentration. The TENG based on PSPE film has the maximum power density of 15.6 mW/m2, which is increased by about 4.7 times compared to commercial PVDF-based TENG. This could be attributed to the increase of the dielectric constant and hydrophobic property of the PVDF film after the surface polarization enhancement process. Furthermore, the PSPE-TENG-driven sensor can simultaneously monitor both the physical and chemical parameters of the streamflow with high sensitivity and minimum error detection, which proves that the PSPE-TENG has enormous potential applications in self-powered streamflow sensing.

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A Study of Contact Electrification Process on PVDF–Metal Interface: Effect of β Phase Composition

Amangeldinova,

Oh,

Lee

et al. 2023

Adv Materials Inter

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Recently, triboelectric nanogenerators (TENGs) are getting considerable attention as an energy harvesting tool that can convert random mechanical energy into electricity due to the wide material selection, low cost, and easy fabrication. TENGs work by contact electrification on the interface and electrostatic induction on the electrodes when two surfaces contact and separate. Herein, the study of the contact electrification process on the metal–polyvinylidene difluoride (PVDF) interface is conducted focusing on the effect of β phase content on the electrical properties of the PVDF films. It is found through the EFM and KPFM surface electrical studies that a higher β phase promotes stronger electrostatic interactions and enhances electron‐cloud overlap with the metal coated cantilever tip that leads to higher amount of charge transfer. Additionally, there is overall enhancement of the TENGs electric output performance for a higher β phase containing PVDF films and the maximum electric output of 8.1 V and 12.2 nA is obtained for the TENG made with 79% β phase PVDF film.

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Surface polarity tuning through epitaxial growth on polyvinylidene fluoride membranes for enhanced performance of liquid-solid triboelectric nanogenerator

Cited by 39 publications

References 51 publications

Functionalized graphene oxide/polyvinylidene fluoride composite membrane acting as a triboelectric layer for hydropower energy harvesting

Functionalized graphene oxide/polyvinylidene fluoride composite membrane acting as a triboelectric layer for hydropower energy harvesting

Polyvinylidene Fluoride Surface Polarization Enhancement for Liquid-Solid Triboelectric Nanogenerator and Its Application

A Study of Contact Electrification Process on PVDF–Metal Interface: Effect of β Phase Composition

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