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

Abstract

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.

Chitosan Nanocomposite-Based Triboelectric Nanogenerators with Enhanced Electrical Performance: An Opportunity for Bioelectronics

“…Further, the anticorrosion properties of the water-born epoxy coating were improved due to the graphene oxide functionalization . Similarly, improved dielectric and polarization properties were seen for perfluorooctyltriethoxysilane functionalized with the GO (F-GO)-doped PVDF nanocomposite . Also, two layers, namely, amine-functionalized reduced graphene oxide doped polyurethane (PU) and graphite fluorinated Ecoflex, exhibited high tribo-positivity and negativity, respectively.…”

“…25 Similarly, improved dielectric and polarization properties were seen for perfluorooctyltriethoxysilane functionalized with the GO (F-GO)-doped PVDF nanocomposite. 26 Also, two layers, namely, amine-functionalized reduced graphene oxide doped polyurethane (PU) and graphite fluorinated Ecoflex, exhibited high tribo-positivity and negativity, respectively. The TENG based on the above offered a reduction in triboelectric losses with improved surface charge characteristics.…”

Triboelectric Nanogenerators Based on 2D Materials: From Materials and Devices to Applications

“…It has great potential to improve the output performance of TNEGs [ 52 ]. Vu et al utilized the blade-coating process to fabricate a liquid–solid TENG based on functionalized graphene oxide (F–GO) and polyvinylidene fluoride (PVDF) composite membranes containing F–GO [ 53 ]. The surface of GO nanosheets was functionalized through covalent grafting utilizing FOTS.…”

Recent progress in self-powered sensor based on liquid-solid triboelectric nanogenerator

“…The charge-generating layer could be an insulator, 15, 42, 45, 53-55, 60, 61, 64, 66-69, 71, 72, 76-80 semiconductor, 23,63,75,[85][86][87] , or conductor 74 material. Lee et al proposed a water droplet-driven TENG (WdTENG) that works in the contact-separation mode, where a water droplet bounces between two superhydrophobic surfaces made by a typical negative triboelectric material, PTFE, as shown inFigure 7a .…”