Self-assembly of three-dimensional interconnected graphene-based aerogels and its application in supercapacitors

Ji, Chenchen; Xu, Maowen; Bao, Shu‐Juan; Cai, Chang-Jun; Lu, Zheng-Jiang; Chai, Hui; Yang, Fan; Wei, Han‐Xun

doi:10.1016/j.jcis.2013.06.054

Cited by 119 publications

(51 citation statements)

References 30 publications

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“…Various synthetic methods of nitrogen-doped graphene (N-graphene) have been developed and its high electrocatalytic activity toward ORR has been studied. Theoretical studies confirmed that breaking the electro neutrality of graphitic materials to create charged sites favorable for O 2 adsorption is a key factor in enhancing ORR activity [18].The catalytic activity of these N-graphene catalysts is strongly linked to the location of the incorporated N in the graphene matrix, and it is reported that the doped-N atoms near the edge of the graphene sheets, in particular, act as the most desirable active sites for improved electrocatalytic activity [19]. The graphene edge defects induced by nitrogen could enable the edge sites to have higher catalytic activity rather than the graphene plane because oxygen adsorption at the edge sites is more favorable than in basal plane [20].…”

Section: Introductionmentioning

confidence: 94%

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Effects of N-doping Methods on the Microstructure and Oxygen Reduction Performance of Carbon Materials

Chen¹,

He²,

Zhang³

2017

dtetr

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ABSTRACT The ongoing search for new non-precious-metal catalysts with excellent electrocatalytic performance to replace Pt-based catalysts is viewed as an important strategy to promote the development of fuel cells. In here, N-doped carbon materials are fabricated by different methods and used as electrocatalysts for oxygen reduction reaction (ORR). The resulting samples are systemically characterized by XRD, SEM, TEM, Raman, XPS and electrochemical measurements to study the synthesis-structure-performance correlation of the N-doped carbon materials for ORR. The experimental results indicates that the synthesis methods have an significantly impact on the bonding state of nitrogen atom in resulting carbon materials, microstructure and electro-catalytic performance of products, and confirms that the obtained 3D interpenetrating microstructured N-doped graphene has an excellent catalytic activity for ORR due to its well-developed porous nanostructures and interconnected conductive networks could provide more electroactive sites and fast ionic channels for electrochemical reaction.

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Section: Introductionmentioning

confidence: 94%

“…Graphene oxide (GO) was prepared from natural graphite flakes using a modified Hummers method (18,19). Carbonized PPy coated graphene aerogel (noted as NGA) was prepared by hydrothermal assisted pyrolysis method as following.…”

Section: Synthesis Of Samplesmentioning

confidence: 99%

Effects of N-doping Methods on the Microstructure and Oxygen Reduction Performance of Carbon Materials

Chen¹,

He²,

Zhang³

2017

dtetr

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“…The interconnected pores arising from nanosize 2D sheets provide unique physicochemical properties such as microstructure, charge mobility, large surface area, and surface functionality depending on the preparation conditions and reacting precursors [32,42]. So far, different polymers/or molecules, for example, chitosan [43], resol [44], polymer [45,46], carbohydrate [43], PVA [47], divalent metal ions [41], carbon nanotube [33], DNA [48], thiourea [31], aqueous ammonia solution [49], luffa sponge [12], and phenolic acid [50], have been reported for the assembly of macroscopic graphene by various physical or chemical interactions. However, very little work was reported for water decontamination applications.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Monolith of Graphene/TEMPO-Oxidized Cellulose Nanofiber as Mechanically Robust, Highly Functional, and Recyclable Adsorbent of Methylene Blue Dye

Hussain

Wang

et al. 2018

Journal of Nanomaterials

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Herein we demonstrate first report on fabrication, characterization, and adsorptive appraisal of graphene/cellulose nanofibers (GO/CNFs) monolith for methylene blue (MB) dye. Series of hybrid monolith (GO/CNFs) were assembled via urea assisted selfassembly method. Hybrid materials were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction patterns, Raman spectroscopy, elemental analysis, thermogravimetric curve analysis, specific surface area, surface charge density measurement, and compressional mechanical analysis. It was proposed that strong chemical interaction (mainly hydrogen bonding) was responsible for the formation of hybrid assembly. GO/CNFs monolith showed mechanically robust architecture with tunable pore structure and surface properties. GO/CNFs adsorbent could completely remove trace to moderate concentrations of MB dye and follow pseudo-second-order kinetics model. Adsorption isotherm behaviors were found in the following order: Langmuir isotherm > Freundlich isotherm > Temkin isotherm model. Maximum adsorption capacity of 227.27 mg g −1 was achieved which is much higher than reported graphene based monoliths and magnetic adsorbent. Incorporation of nanocellulose follows exponential relationship with dye uptake capacities. High surface charge density and specific surface area were main dye adsorptive mechanism. Regeneration and recycling efficiency was achieved up to four consecutive cycles with costeffective recollection and zero recontamination of treated water.

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“…As such, this was a promising example of manifesting the properties of graphene sheets in an aerogel form and inspired a number of related studies. [71][72][73] Worsley et al used a strategy of RF sol-gel chemistry to form carbonaceous "glue" between graphene sheets in the aerogel. Much like the scheme used for the CNT aerogel, a small concentration of the RF sol-gel reactants was added to a 10 mg/mL GO suspension.…”

mentioning

confidence: 99%

“…Zhang et al reported that using ascorbic acid, uniform well-formed aerogels could be created with the expected enhancements in mechanical and electrical properties. Ji et al 71 used carbohydrates (glucose, b-cyclodextrin, and chitosan) as both reducing and morphology-orienting agents in the assembly of GAs. Other "green" reductants that have been reported include tannic acid, dopamine, and amino acids.…”

mentioning

confidence: 99%

Carbon aerogel evolution: Allotrope, graphene-inspired, and 3D-printed aerogels

et al. 2017

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Carbon aerogels (CAs) are a unique class of high surface area materials derived by sol-gel chemistry. Their high mass-specific surface area and electrical conductivity, environmental compatibility, and chemical inertness make them very promising materials for many applications, such as energy storage, catalysis, sorbents, and desalination. Since the first CAs were made via pyrolysis of resorcinol-formaldehyde (RF)-based organic aerogels in the late 1980s, the field has really grown. Recently, in addition to RF-derived amorphous CAs, several other carbon allotropes have been realized in aerogel form: carbon nanotubes (CNTs), graphene, graphite, and diamond. Furthermore, the popularity of graphene aerogels has inspired research into aerogels made of a host of graphene analog materials (e.g., boron nitride, transition metal dichalcogenides, etc.), with potential for an even wider array of applications. Finally, the development of threedimensional-printed aerogels provides the potential for CAs to have an even broader impact on energy-related technologies. Here, we will present recent work covering the novel synthesis of

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Self-assembly of three-dimensional interconnected graphene-based aerogels and its application in supercapacitors

Cited by 119 publications

References 30 publications

Effects of N-doping Methods on the Microstructure and Oxygen Reduction Performance of Carbon Materials

Effects of N-doping Methods on the Microstructure and Oxygen Reduction Performance of Carbon Materials

Hybrid Monolith of Graphene/TEMPO-Oxidized Cellulose Nanofiber as Mechanically Robust, Highly Functional, and Recyclable Adsorbent of Methylene Blue Dye

Carbon aerogel evolution: Allotrope, graphene-inspired, and 3D-printed aerogels

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