Alkali-treated graphene oxide as a solid base catalyst: synthesis and electrochemical capacitance of graphene/carbon composite aerogels

Meng, Fanchang; Zhang, Xuetong; Xu, Bin; Yue, Shufang; Guo, Hui; Luo, Yunjun

doi:10.1039/c1jm13960f

Cited by 123 publications

(77 citation statements)

References 25 publications

(8 reference statements)

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“…31,32 Strong evidence of oxygen species in porous g-C 3 N 4 was firstly confirmed by XPS. 33,34 These signals suggest that the oxygen species are present not simply as absorbed water but as various functional groups on the surface, as a result of the acid treatment of bulk g-C 3 N 4 . 2B, the profile of bulk g-C 3 N 4 does not need to be applied with the Stokes deconvolution method due to its symmetrical nature.…”

Section: Crystal Structure and Chemical States Of Porous G-c 3 Nmentioning

confidence: 99%

Preparation of water-dispersible porous g-C₃N₄ with improved photocatalytic activity by chemical oxidation

Sun

Sui

et al. 2015

Phys. Chem. Chem. Phys.

281

106

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Hydrophilic treatment of bulk graphene-like carbon nitride (g-C3N4) for future applications has aroused extensive interest, due to its enhanced specific surface area and unusual electronic properties. Herein, water-dispersible g-C3N4 with a porous structure can be obtained by chemical oxidation of bulk g-C3N4 with K2Cr2O7-H2SO4. Acid oxidation results in the production of hydroxyl and carboxyl groups on its basal plane and the formation of a porous structure of g-C3N4 at the same time. The porous g-C3N4 appears as networks with tens of micrometers in width and possesses a high specific surface area of 235.2 m(2) g(-1). The final concentration of porous g-C3N4 can be up to 3 mg mL(-1). Compared with bulk g-C3N4, the as-obtained porous g-C3N4 exhibits excellent water dispersion stability and shows great superiority in photoinduced charge carrier separation and transfer. The photocatalytic activities of porous g-C3N4 towards degradation of organic pollutants are much higher than those of the bulk due to the larger band gap (by 0.2 eV) and specific surface areas.

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Section: Crystal Structure and Chemical States Of Porous G-c 3 Nmentioning

confidence: 99%

Preparation of water-dispersible porous g-C₃N₄ with improved photocatalytic activity by chemical oxidation

Sun

Sui

et al. 2015

Phys. Chem. Chem. Phys.

281

106

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“…[26][27][28][29][30][31][32][33][34][35][36] Nguyen et al prepared graphene aerogel from GO aerogel using a hydrothermal method. Generally, graphene aerogel was prepared by pyrolysis of graphene oxide (GO) aerogel or other GO based composites.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of novel porous graphene nanocomposite and its use as electrode and absorbent

et al. 2014

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A novel three-dimensional nanostructured porous graphene nanocomposite was synthesized by sol-gel polymerization of hydroquinol (H) and formaldehyde (F) with sodium carbonate as a catalyst in graphene oxide (GO) suspension, followed by carbonization of HF and thermal reduction of GO to graphene at high temperature. The resulting material shows a BET surface area of 427 m 2 g À1 and a total volume of 1.2764 cm 3 g À1 with abundant mesopores. The porous graphene nanocomposite (HFG) can be used as anode for lithium ion batteries due to the porosity and thermal stability. Also, with the strong surface hydrophobicity, high mesopore ratio and pore volume, the HFG shows good absorption capacity for various organics, which makes the HFG a candidate for removal of organic contaminants from water. ExperimentalPreparation of HF-GO composite GO was prepared via a modied Hummers' method as literature and our previous work. 37-40 The HF-GO composite was prepared using sol-gel method.

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“…[77][78][79][80][81] In this process, a stable suspension of GO with a desired GO concentration can be mixed with specific resorcinol:formaldehyde and resorcinol:catalyst (sodium carbonate) ratios under sonication to form a so-gel mixture. PGAs are mostly prepared through sol-gel polymerization of RF systems in the presence of GO in the sol phase.…”

Section: Nanocomposite Carbon Aerogelsmentioning

confidence: 99%

Self-assembled and pyrolyzed carbon aerogels: an overview of their preparation mechanisms, properties and applications

Allahbakhsh

Bahramian

2015

Nanoscale

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An overview of the synthesis conditions and mechanisms for the fabrication of different types of carbon aerogels, as well as the structural and functional properties of these materials, is presented here. In this overview, carbon aerogels are classified into three major categories: (i) conventional pyrolyzed organic-based carbon aerogels, which are products of the pyrolysis process of organic aerogels; (ii) self-assembled carbon aerogels, which are products of a reduction process; and (iii) nanocomposite carbon aerogels. Synthesis mechanisms for the sol-gel process of organic aerogels are reviewed using different mechanisms suggested in the literature. Moreover, the overall fabrication process of self-assembled carbon aerogels (graphene and carbon nanotube aerogels) is covered and the suggested mechanism for the gelation process of self-assembled carbon aerogels during the reduction process is investigated using reported mechanisms. The structural performance and functional properties (electrochemical and thermal properties) of different types of carbon aerogels are covered in detail. Moreover, different structural features of carbon aerogels and the influence of synthesis conditions on these structural characteristics are assessed and compared. Based on the literature results covered in this review paper, carbon aerogels are perfect candidates for the fabrication of ultra-low density supercapacitors, as well as thermal insulating materials.

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Alkali-treated graphene oxide as a solid base catalyst: synthesis and electrochemical capacitance of graphene/carbon composite aerogels

Cited by 123 publications

References 25 publications

Preparation of water-dispersible porous g-C₃N₄ with improved photocatalytic activity by chemical oxidation

Preparation of water-dispersible porous g-C₃N₄ with improved photocatalytic activity by chemical oxidation

Synthesis of novel porous graphene nanocomposite and its use as electrode and absorbent

Self-assembled and pyrolyzed carbon aerogels: an overview of their preparation mechanisms, properties and applications

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Alkali-treated graphene oxide as a solid base catalyst: synthesis and electrochemical capacitance of graphene/carbon composite aerogels

Cited by 123 publications

References 25 publications

Preparation of water-dispersible porous g-C3N4 with improved photocatalytic activity by chemical oxidation

Preparation of water-dispersible porous g-C3N4 with improved photocatalytic activity by chemical oxidation

Synthesis of novel porous graphene nanocomposite and its use as electrode and absorbent

Self-assembled and pyrolyzed carbon aerogels: an overview of their preparation mechanisms, properties and applications

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Preparation of water-dispersible porous g-C₃N₄ with improved photocatalytic activity by chemical oxidation

Preparation of water-dispersible porous g-C₃N₄ with improved photocatalytic activity by chemical oxidation