One-pot self-assembly of three-dimensional graphene macroassemblies with porous core and layered shell

Lv, Wei; Tao, Ying; Ni, Wang; Zhou, Zhi; Su, Fangyuan; Chen, Xuecheng; Jin, Fengmin; Yang, Quan‐Hong

doi:10.1039/c1jm11728a

Cited by 65 publications

(51 citation statements)

References 37 publications

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“…43,[46][47][48][49] This feature further proves the reduction of GO, which is consistent with the FT-IR and XRD data. [44][45][46][47][48][49] Due to the high surface area of graphene sheets (calculated value: 2630 m 2 g À1 ), a higher surface area of MGC than Mg(OH) 2 may be expected. 50 The N 2 adsorption-desorption isotherms at 77 K and pore-size distribution plot of MGC calculated with the Barrett-Joyner-Halenda (BJH) method are shown in Fig.…”

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confidence: 90%

Mg(OH)2@reduced graphene oxide composite for removal of dyes from water

2011

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The Mg(OH) 2 @reduced graphene oxide (rGO) composite (MGC) was synthesized via a chemical deposition method. Its mesoporous structures and application as an adsorbent for the removal of methylene blue (MB) from water were investigated. The Mg(OH) 2 nanosheets were formed and dispersed homogeneously onto the surface of rGO sheets, which provided high surface area, pore volume, and uniform pore width distribution. MGC exhibited excellent adsorption behavior for MB.Graphene and reduced graphene oxide (rGO) possess a unique twodimensional layer structure of sp 2 -hybridized carbon atoms, and are predicted to have a wide range of functions such as elastic properties, novel electronic properties as a zero-band gap semiconductor, and high electronic conductivity in storing and shuttling electronics. 1-3 It has been demonstrated that rGO incorporated with inorganic materials displays high activity in various applications, such as photocatalysis, and solar cells, etc. 4-7 These advanced functions can be attributed to the interaction between rGO and inorganic materials. [8][9][10][11][12][13] One potential application of rGO is to utilize the surface electrostatic properties of functional groups in rGO to fabricate novel adsorbents for the removal of contaminants in environmental issues. 14,15 It is interesting that rGO can be made use of as an adsorption material for the removal of various contaminants from water. 14,15 The twodimensional network structure of rGO in the micro-scale also provides a workplace for other functional inorganic materials. This feature warrants the assembly of inorganic materials on the microscale structure and the resulting interaction with inorganic materials. 8,13 On the other hand, the existence of inorganic materials will prevent the aggregation of rGO sheets and keep the surface area and pore volume at a high level which is required for applications such as adsorption processes and photocatalysis. 15 The functional groups in rGO surface also can influence the crystalline process of inorganic materials, which have been used to conduct controllable syntheses. The controllable synthesis of inorganic nanoparticles on rGO sheets provided an efficient route for generating novel functional composite materials. 11,12 Ni(OH) 2 particles and/or sheets can be controllably obtained in the synthesis of graphene-based nanocomposite, due to the existence of various rGO sheets. 11,12 As a useful inorganic chemical, the nanostructured Mg(OH) 2 has roused interest and has been synthesized by various methods. 16-26 Superior properties such as waste water treatments and the desulfurization of waste gases have been reported. 16,25,[27][28][29] Due to the environmental friendly property and low expense of Mg(OH) 2 , it will provide an opportunity for developing novel adsorbents by synthesizing the graphene-based Mg (OH) 2 nanocomposites which are expected to possess superior performances. However, to the best of our knowledge, there is no report on the fabrication of this kind of nanocomposite. Herein, the Mg(OH...

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confidence: 90%

Mg(OH)2@reduced graphene oxide composite for removal of dyes from water

2011

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“…Since the first report about the gelation of reduced graphene oxide by Li et al [8], constructing graphene into a three dimensional (3D) structure has been recognized as one of the most effective approaches for preparation of novel functional graphene-based materials [9][10][11][12][13][14][15][16]. Accordingly, graphene-based hydrogels have been fabricated by hydrothermal treatment of GO aqueous solution under high pressure [9,17] or self-assembly of GO sheets with the assistance of diverse of reducing agents, such as hydrazine hydrate [18], ascorbic acid/sodium ascorbate [19][20][21], NaHSO 3 [22], hydroiodic acid [23] and horhypophosphorous acid-iodine [24]. However, all these hydrogels were mechanically weak with a typical fracture stress in the range from 20 to 660 kPa and most of them were electrically poor with a conductivity of 10 À3 -10 À2 S/cm, which hinder their applications in fields from electronic devices to soft machine.…”

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confidence: 99%

Graphene/poly(3,4-ethylenedioxythiophene) hydrogel with excellent mechanical performance and high conductivity

Zhou

Yao

et al. 2013

Carbon

114

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“…Currently used electrode materials like activated carbons and novel nanocarbons are characterized by a large specific surface area that contributes to a high gravimetric capacitance, but the organization of perfect or defective graphene nanosheets in a low density structure results in limited volumetric capacitance. Of interest to chemists or materials scientists, graphene nanosheets may act as the real building blocks to realize bottom-up assembly of novel carbon nanostructures and even directly into three dimensional (3D) macroform materials with desired properties22232425262728293031323334. Typically, most of those graphene assemblies reported to date and seen as promising electrode materials2223242526272829 are formed from interlinked graphene nanosheets and show high specific surface area, excellent conductivity and open ion channels.…”

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confidence: 99%

Towards ultrahigh volumetric capacitance: graphene derived highly dense but porous carbons for supercapacitors

Tao

Xie

et al. 2013

Sci Rep

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556

391

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A small volumetric capacitance resulting from a low packing density is one of the major limitations for novel nanocarbons finding real applications in commercial electrochemical energy storage devices. Here we report a carbon with a density of 1.58 g cm−3, 70% of the density of graphite, constructed of compactly interlinked graphene nanosheets, which is produced by an evaporation-induced drying of a graphene hydrogel. Such a carbon balances two seemingly incompatible characteristics: a porous microstructure and a high density, and therefore has a volumetric capacitance for electrochemical capacitors (ECs) up to 376 F cm−3, which is the highest value so far reported for carbon materials in an aqueous electrolyte. More promising, the carbon is conductive and moldable, and thus could be used directly as a well-shaped electrode sheet for the assembly of a supercapacitor device free of any additives, resulting in device-level high energy density ECs.

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One-pot self-assembly of three-dimensional graphene macroassemblies with porous core and layered shell

Cited by 65 publications

References 37 publications

Mg(OH)2@reduced graphene oxide composite for removal of dyes from water

Mg(OH)2@reduced graphene oxide composite for removal of dyes from water

Graphene/poly(3,4-ethylenedioxythiophene) hydrogel with excellent mechanical performance and high conductivity

Towards ultrahigh volumetric capacitance: graphene derived highly dense but porous carbons for supercapacitors

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