Carbon Nanotube Sponges

Gui, Xuchun; Wei, Jinquan; Wang, Kunlin; Cao, Anyuan; Zhu, Hongwei; Jia, Yi; Shu, Qinke; Wu, Dehai

doi:10.1002/adma.200902986

Cited by 1,432 publications

(1,197 citation statements)

References 28 publications

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“…When an octane droplet was placed on the surface, it could be quickly absorbed into the PDMS-treated AK 1 powder without absorption of water, implying an excellent selective absorption performance (see the Supporting Information, Figure S1). Similar observations were also made in other systems including superhydrophobic absorbents for the selective absorption of oils or organics from water, such as superwetting nanowire membranes, [13] carbon nanotube sponges, [3] nanoporous polydivinylbenzene, [14] and spongy graphene. [15] To investigate the effect of PDMS deposition on the chemical composition of the surface of PDMS-treated AK 1 , X-ray photoelectron spectroscopy (XPS) measurements were also performed.…”

Section: Resultssupporting

confidence: 78%

“…So far, a number of efficient absorbent materials, including clay, [1] carbon nanotubes, [2,3] organicinorganic hydrids, [4] zeolites, [5] and activated carbon, [6,7] have been developed. However, these materials suffer from a number of drawbacks, such as poor selectivity and low absorption capacities, due to their weak affinity to organics or oils.…”

Section: Introductionmentioning

confidence: 99%

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Superhydrophobic Activated Carbon‐Coated Sponges for Separation and Absorption

Sun¹,

An²,

Zhu³

et al. 2013

ChemSusChem

194

105

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Highly porous activated carbon with a large surface area and pore volume was synthesized by KOH activation using commercially available activated carbon as a precursor. By modification with polydimethylsiloxane (PDMS), highly porous activated carbon showed superhydrophobicity with a water contact angle of 163.6°. The changes in wettability of PDMS‐ treated highly porous activated carbon were attributed to the deposition of a low‐surface‐energy silicon coating onto activated carbon (confirmed by X‐ray photoelectron spectroscopy), which had microporous characteristics (confirmed by XRD, SEM, and TEM analyses). Using an easy dip‐coating method, superhydrophobic activated carbon‐coated sponges were also fabricated; those exhibited excellent absorption selectivity for the removal of a wide range of organics and oils from water, and also recyclability, thus showing great potential as efficient absorbents for the large‐scale removal of organic contaminants or oil spills from water.

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Section: Resultssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Activated Carbon‐Coated Sponges for Separation and Absorption

Sun¹,

An²,

Zhu³

et al. 2013

ChemSusChem

194

105

View full text Add to dashboard Cite

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“…According to the literature 13 , all the existing carbon foams and porous carbons except for those made of fibrous carbon 15,17,19,21 or graphitic ribbons 20 are prone to failure in a brittle manner when subjected to macroscopic deformation. Previous studies suggest that when foam made of mono-or very few layers of graphene is severely compressed, the intersheet van der Waals adhesion would overwhelm the elastic energy stored, preventing elastic recovery 13,37 .…”

Section: Resultsmentioning

confidence: 99%

“…However, as with most of the existing porous carbon materials 13 , the resulting graphene monoliths are generally brittle and have small recoverable deformation before failure unless they are infiltrated with an elastomeric polymer 5 or grown on pre-formed carbon nanotube aerogels 14 . Superelasticity that has been observed in foams made of carbon-based tubular or fibrillar nanostructures [15][16][17][18][19][20][21] has not been achieved in foams solely based on graphene sheets. Indeed, as the specific elastic bending stiffness of a sheet-like structure is known to be intrinsically inferior to that of its tubular or fibrillar counterparts 22 , previous analysis 13 suggests that it would be highly challenging to realize superelasticity in graphene foams.…”

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confidence: 99%

Biomimetic superelastic graphene-based cellular monoliths

et al. 2012

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Many applications proposed for graphene require multiple sheets be assembled into a monolithic structure. The ability to maintain structural integrity upon large deformation is essential to ensure a macroscopic material which functions reliably. However, it has remained a great challenge to achieve high elasticity in three-dimensional graphene networks. Here we report that the marriage of graphene chemistry with ice physics can lead to the formation of ultralight and superelastic graphene-based cellular monoliths. Mimicking the hierarchical structure of natural cork, the resulting materials can sustain their structural integrity under a load of 450,000 times their own weight and can rapidly recover from 480% compression. The unique biomimetic hierarchical structure also provides this new class of elastomers with exceptionally high energy absorption capability and good electrical conductivity. The successful synthesis of such fascinating materials paves the way to explore the application of graphene in a self-supporting, structurally adaptive and 3D macroscopic form.

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“…For example, graphene-or carbon-nanotube-based aerogels or sponges possess many fascinating advantages, including tunable hierarchical morphology, high surface area, light weight, and good electrical conductivity. [72][73][74][75] Moreover, such aerogels can act as a matrix to support active materials, and can thus be used as flexible electrode for SIBs. [76,77] Second, searching for environmentally friendly active materials for flexible SIBs is necessary.…”

Section: Summary and Perspectivesmentioning

confidence: 99%

Flexible Electrodes for Sodium‐Ion Batteries: Recent Progress and Perspectives

et al. 2017

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accessible lithium reserves are in remote or in politically sensitive areas. [5] This fact should sound the alarm for the expanded application of LIBs, because the increasing demand for LIBs could cause the price of lithium to skyrocket. It is even predicted that the world will run out of lithium supplies in the foreseeable future. [6][7][8] It is well known that sodium resources are more abundant (abundance: 23.6 × 10 3 mg kg −1 vs 20 mg kg −1 ) and vast (for example, the United States alone possesses 23 billion tons of soda ash which is a sodium-containing precursor) than lithium analog. Additionally, the trona (about $135-165 per ton), which could be used to produce sodium carbonate, has much lower cost than lithium carbonate (about $5000 per ton in 2010). [9,10] These two features endow SIBs with fascinating advantages for large-scale EES applications in the near future. Without doubt, SIBs also face big challenges: performance improvement and technological innovation. Although sodium has similar physical and chemical properties to lithium, the larger ionic radius of sodium ions compared with that of lithium ions restricts the insertion and extraction of sodium ions from the host materials commonly explored for LIBs. To address this problem, optimizing the chemical composition, tailoring the lattice structures, and regulating the morphologies of the host materials seem to be the most applicable strategies, and there have already been several excellent reviews. [11][12][13][14][15][16] As for technological innovation, the traditional fabrication processes mainly based on the slurrycasting method not only make SIBs typically rigid, thick, bulky, and heavy, but also reduce the overall volumetric/gravimetric energy density of the electrode. In the traditional slurry-casting method, the binders are insulating and electrochemically inactive, which can not only decrease the electrical conductivity, but also has a detrimental effect on the cycling stability resulting from some side effects between the electrolyte and inactive materials. In addition, the heavy weight of the binders, conductive additives and current collectors also reduces the volumetric/ gravimetric energy density of the overall electrode. Therefore, to enhance the battery performance and simplify the preparation process, the traditional slurry-casting method should be improved or even replaced; in other words, avoiding the use of binder, conductive additive, and metal current collector.In contrast, flexible electrodes are usually made from various active materials built on flexible conductive substrates without binder, conductive additive, and even metal current collector, Sodium-Ion Batteries

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Carbon Nanotube Sponges

Cited by 1,432 publications

References 28 publications

Superhydrophobic Activated Carbon‐Coated Sponges for Separation and Absorption

Superhydrophobic Activated Carbon‐Coated Sponges for Separation and Absorption

Biomimetic superelastic graphene-based cellular monoliths

Flexible Electrodes for Sodium‐Ion Batteries: Recent Progress and Perspectives

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