3D architectures of titania nanotubes and graphene with efficient nanosynergy for supercapacitors

Ponnamma, Deepalekshmi; P, Poornima Vijayan; Al-Maadeed, Somaya

doi:10.1016/j.matdes.2016.12.090

Cited by 47 publications

(20 citation statements)

References 40 publications

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“…The graphene-TiO 2 hybrid structure was synthesized according to the previously reported protocol [31]. By this procedure, a dispersion of GO in distilled water was made (0.1 g in 10 ml) to which TiO 2 dispersion (1.2 g in 10 ml) was added.…”

Section: Synthesis Of Graphene-tio 2 Fillermentioning

confidence: 99%

“…This leads to a very good homogeneity and uniformity in filler dispersion within the polymer, and thus the nanocomposite is capable of showing good properties even at low filler concentrations (as will be seen later). Hydrothermal synthesis of G-T nanohybrid ensures the formation of nanotubes on the surface of rGO sheets as well as the folded sheets around the tubes [31]. Good interfacial interaction was observed for such hybrid architecture due to the presence of additional C-Ti bond [34].…”

Section: Morphologymentioning

confidence: 99%

“…The hybrid architecture of graphene-TiO 2 was achieved by hydrothermally growing the TiO 2 nanotubes in presence of GO [31]. The nanosheet-nanotube hybrid structure imposed good dielectric properties, at the same time, the third ceramic SrTiO 3 filler particles were added to induce the piezoelectric effect.…”

Section: Introductionmentioning

confidence: 99%

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Stretchable quaternary phasic PVDF-HFP nanocomposite films containing graphene-titania-SrTiO3 for mechanical energy harvesting

et al. 2018

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Integrating efficient energy harvesting materials in to soft, flexible, and eco-friendly substrates could yield significant breakthroughs in wearable and flexible electronics. Substantial advances are emerged in fabricating devices which can conform to irregular surfaces in addition to integrating piezoelectric polymer nanocomposites in to mechanical generators and bendable electronics. Here, we present a tri-phasic filler combination of one-dimensional titanium dioxide (TiO 2 ) nanotubes, twodimensional reduced graphene oxide, and three-dimensional strontium titanate (SrTiO 3 ), introduced in to a semi-crystalline polymer, poly(vinylidene fluoride-co-hexafluoropropylene). Simple mixing method was adopted for the composite fabrication after ensuring a high interaction between the various fillers. The prepared films were tested for their piezoelectric responses and mechanical stretchability. The results showed that the piezoelectric constant has increased due to the change in the filler concentration and reached a value of 7.52 pC/N at 1:2 filler combination. The output voltage obtained for the same filler composition was about 10.5 times that of the voltage generated by the neat polymer. Thus, we propose integration of these materials in fabricating energy conversion devices that can be useful in flexible and wearable electronics.

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Section: Synthesis Of Graphene-tio 2 Fillermentioning

confidence: 99%

Section: Morphologymentioning

confidence: 99%

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Stretchable quaternary phasic PVDF-HFP nanocomposite films containing graphene-titania-SrTiO3 for mechanical energy harvesting

et al. 2018

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“…Since the synergistic combination of fillers always increase the rate of dispersion of both fillers in the polymer matrix [25][26][27][28][29], the combination of hBN and Co 3 O 4 is done here in this work, to fabricate the nanocomposite fibers of PS. Both the polymer and the composites are fabricated by electrospinning and followed by gamma irradiation to trigger crosslink formation; and thus to enhance the surface roughness.…”

Section: Introductionmentioning

confidence: 99%

White Graphene-Cobalt Oxide Hybrid Filler Reinforced Polystyrene Nanofibers for Selective Oil Absorption

et al. 2019

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In this work, stable hydrophobic nanocomposites are made from electrospun fibers of polystyrene (PS) containing a hybrid filler combination of (i) hexagonal boron nitride (hBN) and (ii) cobalt oxide (Co3O4) nanomaterials. Good synergistic interaction is observed between the nanomaterials, since the growth of Co3O4 was carried out in presence of white graphene nanosheets. Filler synergy modifies the PS surfaces, by enhancing the filler-polymer interfacial interactions and provides good tensile strength. The hydrophobic films are gamma irradiated to improve crosslinking within the polymer nanocomposites. Since gamma irradiation enhances the surface roughness, its hydrophobicity/oleophilicity increases much and the final nanofibers show good oil-water separation efficiency. The nanofibers act as sponge clothing to skim the oil from a mixture of oil and water. Durability of the fibers in hot water and in presence of ultrasonic waves is also tested and good response is achieved. Contact angle studies are performed to investigate the surface properties and to check the influence of gamma irradiation on the surface wettability. The gamma-irradiated PS nanocomposite fiber shows a contact angle of 152° ± 2° compared to the 140° ± 1° of the neat PS fiber, evidencing the superhydrophobicity. Both the effects of crosslink density enhancement and hybrid filler distribution make the composite fibers stronger in oil absorption application even at higher operation temperatures. The fibers are reported to be robust and durable, in addition.

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“…Additionally, the dissemination of metal oxides as spacers within the 3D graphene aerogels demonstrates a pathway not only to inhibit the restacking of graphene sheets during the formation of aerogels, but also to impart the remarkable characteristics of metal oxides, resulting in a multifunctional 3D graphene porous macrostructure. These hybrid graphene‐based architectures exhibit a highly interconnected pore structure, low density, and exceptionally large surface area, allowing for fast electron and ion transport, which make them prospective alternatives for supercapacitor electrodes …”

Section: Introductionmentioning

confidence: 99%

Enhancing electrochemical performance of Fe₃O₄/graphene hybrid aerogel with hydrophilic polymer

Zhan

Yang

Yan

et al. 2017

J of Applied Polymer Sci

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Graphene hybrid aerogels have attracted attention as electrode materials because of their unique porous architectures. However, their electrochemical performance is limited by the intrinsic hydrophobicity and the ease of aggregation of graphene nanosheets. We demonstrate a unique methodology to produce graphene hybrid aerogels through assembly of graphene nanosheets, nanometer-scale ferroferric oxide (Fe 3 O 4 ), and hydrophilic poly(vinyl alcohol) (PVA) into three-dimensional hierarchical macrostructures. Electrochemical performance measurements exhibit a significant improvement in the specific capacitance of this ternary hybrid aerogel with remarkable cycling stability. Specifically, the specific capacitance is nearly 6.6 times higher than that of the neat graphene aerogel, and a cycling capacitance retention rate of 99% was achieved after 2000 cycles at a high current density of 0.5 A g 21 . Electrochemical impedance spectroscopy measurements demonstrate a lower resistance in the Fe 3 O 4 /graphene/PVA aerogel electrode compared with that of both neat graphene and Fe 3 O 4 /graphene aerogel electrodes. The obtained graphene hybrid aerogels with outstanding cycling performance and high energy density are very promising as electrode materials for supercapacitors.

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3D architectures of titania nanotubes and graphene with efficient nanosynergy for supercapacitors

Cited by 47 publications

References 40 publications

Stretchable quaternary phasic PVDF-HFP nanocomposite films containing graphene-titania-SrTiO3 for mechanical energy harvesting

Stretchable quaternary phasic PVDF-HFP nanocomposite films containing graphene-titania-SrTiO3 for mechanical energy harvesting

White Graphene-Cobalt Oxide Hybrid Filler Reinforced Polystyrene Nanofibers for Selective Oil Absorption

Enhancing electrochemical performance of Fe₃O₄/graphene hybrid aerogel with hydrophilic polymer

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3D architectures of titania nanotubes and graphene with efficient nanosynergy for supercapacitors

Cited by 47 publications

References 40 publications

Stretchable quaternary phasic PVDF-HFP nanocomposite films containing graphene-titania-SrTiO3 for mechanical energy harvesting

Stretchable quaternary phasic PVDF-HFP nanocomposite films containing graphene-titania-SrTiO3 for mechanical energy harvesting

White Graphene-Cobalt Oxide Hybrid Filler Reinforced Polystyrene Nanofibers for Selective Oil Absorption

Enhancing electrochemical performance of Fe3O4/graphene hybrid aerogel with hydrophilic polymer

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Enhancing electrochemical performance of Fe₃O₄/graphene hybrid aerogel with hydrophilic polymer