“…Graphene (G) and its family materials including graphene oxide (GO) and reduced graphene oxide (rGO) have been used widely for metal corrosion protection [1][2][3][4], which is beneficial due to its excellent physical barrier, chemical and electrochemical properties. However, because of strong van der Waals forces and high specific ratio, G, GO or rGO tend to easily aggregate each other, which greatly limits their functional development and industrial applications [5][6][7].…”
Reduced graphene oxide–epoxy grafted poly(styrene-co-acrylate) composites (GESA) were prepared by anchoring different amount of epoxy modified poly(styrene-co-acrylate) (EPSA) onto reduced graphene oxide (rGO) sheets through π–π electrostatic attraction. The GESA composites were characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The anti-corrosion properties of rGO/EPSA composites were evaluated by electro-chemical impedance spectroscopy (EIS) in hydroxyl-polyacrylate coating, and the results revealed that the corrosion rate was decreased from 3.509 × 10−1 to 1.394 × 10−6 mm/a.
“…Graphene (G) and its family materials including graphene oxide (GO) and reduced graphene oxide (rGO) have been used widely for metal corrosion protection [1][2][3][4], which is beneficial due to its excellent physical barrier, chemical and electrochemical properties. However, because of strong van der Waals forces and high specific ratio, G, GO or rGO tend to easily aggregate each other, which greatly limits their functional development and industrial applications [5][6][7].…”
Reduced graphene oxide–epoxy grafted poly(styrene-co-acrylate) composites (GESA) were prepared by anchoring different amount of epoxy modified poly(styrene-co-acrylate) (EPSA) onto reduced graphene oxide (rGO) sheets through π–π electrostatic attraction. The GESA composites were characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The anti-corrosion properties of rGO/EPSA composites were evaluated by electro-chemical impedance spectroscopy (EIS) in hydroxyl-polyacrylate coating, and the results revealed that the corrosion rate was decreased from 3.509 × 10−1 to 1.394 × 10−6 mm/a.
“…To get out of these problems, reports on a polymer matrix supported by ferroelectric powder composites have been found, which fortified a large area of manufacturing devices, reduced cost, sustain high-stress forces, and enhanced mechanical resilience, but are not admissible in low magnitude and frequency input forces [146,153]. This time, highly durable and elastic polymer ferroelectric-based PENGs were proposed, with high mechanical permanence and optimistic output performances [62,[162][163][164]. Semimetallic/conductive layers or electrodes are deposited over the ferroelectric active layers to get charge separation without poling; graphene is a potential conductive layer, due to high thermal and electrical properties over the large surface area.…”
Section: Device Design and Output Power Optimization In Piezoelectric Pengsmentioning
confidence: 99%
“…The conventional semiconductor materials do not own this property and so ferroelectrics gather more attention [52]. The most active ferroelectric materials encapsulated in nanogenerator application are inorganic ferroelectric ceramics and organic polymers; the best of them include BaTiO 3 (BTO) [53], PbZr 1-x Ti x O 3 (PZT) [54], Na 0.5 Bi 0.5 TiO 3 (NBT) [55], KNaNbO 3 (KNN) [56], BiFeO 3 (BFO) [57], Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) [58], PVDF [59][60][61], and P(VDF-TrFE) [62]. In comparison with inorganic ferroelectrics, very few organic ferroelectrics exist.…”
Innovations in nanogenerator technology foster pervading self-power devices for human use, environmental surveillance, energy transfiguration, intelligent energy storage systems, and wireless networks. Energy harvesting from ubiquitous ambient mechanical, thermal, and solar energies by nanogenerators is the hotspot of the modern electronics research era. Ferroelectric materials, which show spontaneous polarization, are reversible when exposed to the external electric field, and are responsive to external stimuli of strain, heat, and light are promising for modeling nanogenerators. This review demonstrates ferroelectric material-based nanogenerators, practicing the discrete and coupled pyroelectric, piezoelectric, triboelectric, and ferroelectric photovoltaic effects. Their working mechanisms and way of optimizing their performances, exercising the conjunction of effects in a standalone device, and multi-effects coupled nanogenerators are greatly versatile and reliable and encourage resolution in the energy crisis. Additionally, the expectancy of productive lines of future ensuing and propitious application domains are listed.
“…RGO loaded nanocomposite PVDF films demonstrated a 13.8% increase in piezo-voltage with the same pressure action when exposed to ultraviolet-visible light. The Yuan Lin group reported reduced graphene oxide and PVDF-TrFE sheets based on piezoelectric nanogenerators in 2019( Hu et al., 2019 ). The rGO/PVDF-TrFE films were prepared using scrap coating and in situ electric polarization in this study, and wearable nanogenerators with improved piezoelectric properties and energy-harvesting performance were fabricated.…”
Section: Introductionmentioning
confidence: 99%
“… Figure 5 Polymer-2D composite material based Piezoelectric nanogenerator (A–E) Piezoelectric Output response for different PVDF/RGO composite based nanogenerator and touch and release response from nanocomposite films( Anand et al., 2020 ). (F and G) Output voltage and current measurements of rGO/PVDF-TrFE based PENGs with varied rGO concentrations ( Hu et al., 2019 ). (H–J) The piezoelectric output voltage responses of leaf, match stick, and finger touch for different applied stress when falling on the upper surface of PNG.…”
Summary
Self-powered wearable devices, with the energy harvester as a source of energy that can scavenge the energy from ambient sources present in our surroundings to cater to the energy needs of portable wearable electronics, are becoming more widespread because of their miniaturization and multifunctional characteristics. Triboelectric and piezoelectric nanogenerators are being explored to harvest electrical energy from the mechanical vibrations. Integration of these two effects to fabricate a hybrid nanogenerator can further enhance the output efficiency of the nanogenerator. Here, we have discussed the importance of 2D materials which plays an important role in the fabrication of nanogenerators because of their distinct characteristics, such as, flexibility, mechanical stability, nontoxicity, and biodegradability. This review mainly emphasizes the piezoelectric, triboelectric, and hybrid nanogenerator based on the 2D materials and their van der Waals heterostructure, as well as the effect of polymer-2D composite on the output performance of the nanogenerator.
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