Graphene nanosheets as electrode material for electric double-layer capacitors

Du, Xian; Guo, Peng; Song, Huaihe; Chen, Xiaohong

doi:10.1016/j.electacta.2010.03.047

Cited by 338 publications

(150 citation statements)

References 43 publications

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“…Furthermore, supercapacitors have generally used carbonaceous materials with a large surface area (e.g. carbon nanotubes [2], carbon [3] and graphene [4]) and transition metal oxides (e.g. Co 3 O 4 [5,6], NiO [7], RuO 2 [8], SnO 2 [9], MnO 2 [10], V 2 O 5 [11], and so forth).…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of simonkolleite microplatelets on nickel foam-graphene for electrochemical supercapacitors

Khamlich

Bello

Fabiane

et al. 2013

J Solid State Electrochem

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Nickel foam-graphene (NF-G) was synthesised by chemical vapour deposition (CVD) followed by facial in situ aqueous chemical growth of simonkolleite (Zn 5 (OH) 8 Cl 2 ·H 2 O) under hydrothermal conditions to form NF-G/simonkolleite composite. X-ray diffraction and Raman spectroscopy show the presence of simonkolleite on the NF-G, while scanning electron and transmission electron microscopies show simonkolleite micro-plates like structure evenly distributed on the NF-G. Electrochemical measurements of the composite electrode give a specific capacitance of 350 Fg -1 at current density of 0.7 Ag -1 for our device measured in three-electrode configuration. The composite also shows a rate capability of 87% capacitance retention at a high current density of 5 Ag -1 , which makes it a promising candidate as an electrode material for supercapacitor applications.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of simonkolleite microplatelets on nickel foam-graphene for electrochemical supercapacitors

Khamlich

Bello

Fabiane

et al. 2013

J Solid State Electrochem

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“…After compositing with CL and CS and carbonization, it changes to 34.37% and 30%, respectively. It is well known that the mesoporous (>2 nm) channels and uniform pore sizes between 3 nm to 5 nm are required to improve the capacitance of EDLC (Du, Guo, Song & Chen, 2010). Therefore, the ratio of microspore content of NC@CCL and NC@CCS decreased with the increase of mesopores, which is benefit for improving the storage efficiency.…”

Section: Physicochemical Characterizationmentioning

confidence: 97%

Carbon materials derived from chitosan/cellulose cryogel-supported zeolite imidazole frameworks for potential supercapacitor application

Yang

Cao

et al. 2017

Carbohydrate Polymers

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a b s t r a c tIn order to promote sustainable development, green and renewable clean energy technologies continue to be developed to meet the growing demand for energy, such as supercapacitor, fuel cells and lithiumion battery. It is urgent to develop appropriate nanomaterials for these energy technologies to reduce the volume of the device, improve the efficiency of energy conversion and enlarge the energy storage capacity. Here, chitosan/cellulose carbon cryogel (CCS/CCL) were designed and synthesized. Through the introduction of zeolite imidazole frameworks (ZIFs) into the chitosan/cellulose cryogels, the obtained materials showed a microstructure of ZIF-7 (a kind of ZIFs) coated chitosan/cellulose fibers (CS/CL). After carbonizing, the as-prepared carbonized ZIF-7@cellulose cryogel (NC@CCL, NC is carbonized ZIF-7) and carbonized ZIF-7@chitosan cryogel (NC@CCS) exhibited suitable microspore contents of 34.37% and 30%, respectively, and they both showed an internal resistance lower than 2 . Thereby, NC@CCL and NC@CCS exhibited a high specific capacitance of 150.4 F g −1 and 173.1 F g −1 , respectively, which were much higher than those of the original materials. This approach offers a facile method for improving the strength and electronic conductivity of carbon cryogel derived from nature polymers, and also efficiently inhibits the agglomeration of cryogel during carbonization in high temperature, which opens a novel avenue for the development of carbon cryogel materials for application in energy conversion systems.

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“…It is well known that Raman spectroscopy is a useful technique to investigate various carbon composite materials [38]; the Raman spectra for the composites are shown in Fig. 3b.…”

Section: Articlesmentioning

confidence: 99%

Preparation and adsorption capacity evaluation of graphene oxide-chitosan composite hydrogels

et al. 2015

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(Zhang Q)) ty, and strong mechanical strength [13−16]. For example, Banerjee et al. [17,18] successfully achieved the preparation of various hydrogels that can be used as dye-adsorbing agents in waste-water removal. In addition, this group has also reported metal-nanoparticle-containing GObased hydrogels and novel morphological transformation of graphene based nanohybrids [19−21]. Generally, GObased composite hydrogels were obtained by mixing organic macromolecules or small amphiphiles with an aqueous GO dispersion [22−24]. Chitosan (CS), a well-known compound of chitin N-deacetylation, shows many eco-friendly properties, such as biodegradation, good biocompatibility, and antifungal activity. These characteristics make it a promising candidate in the fields of catalysis, materials, food, drugs, etc. [25−27]. Since GO crosslinks with chitosan via the carboxyl, hydroxyl, epoxy, and amine groups of chitosan, the adsorption capacity of the formed composite is expected to be high. To date, some reports have been published on GO-chitosan nanocomposites used for drug release and antimicrobial activity [28−32].In this study, we report the preparation of GO-based composite hydrogels using the self-assembly of CS and GO, and an in situ reduction approach. The composite hydrogels consist of both hydrogen bonding and electrostatic interactions between the CS molecules and GO sheets. CS molecules were incorporated to facilitate the gelation process of GO sheets, and the dye adsorption capacity of the hydrogel was mainly attributed to the GO sheets. For the three dyes tested in this study, namely, Congo red (CR), methylene blue (MB), and Rhodamine B (RhB), the as-prepared composite hydrogels exhibit good removal rates in accordance with the pseudo-second-order model. More importantly, the hydrogels prepared in this study have potential large-scale applications in organic dye removal and Graphene oxide (GO)-chitosan composite hydrogels were successfully prepared via the self-assembly of chitosan molecules and GO . These as-prepared hydrogels were characterized by different techniques. The morphology of the internal network structure of the nanocomposite hydrogels was investigated. The adsorption capacity results demonstrate that the prepared GObased composite hydrogels can efficiently remove three tested dye molecules, Congo red, methylene blue and Rhodamine B, from wastewater in accordance with the pseudo-second-order model. The dye adsorption capacity of the obtained hydrogels is mainly attributed to the GO sheets, whereas the chitosan molecule was incorporated to facilitate the gelation process of the GO sheets. The present study indicates that the as-prepared composite hydrogels can serve as good adsorbents for wastewater treatment as well as the removal of harmful dyes.

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Graphene nanosheets as electrode material for electric double-layer capacitors

Cited by 338 publications

References 43 publications

Hydrothermal synthesis of simonkolleite microplatelets on nickel foam-graphene for electrochemical supercapacitors

Hydrothermal synthesis of simonkolleite microplatelets on nickel foam-graphene for electrochemical supercapacitors

Carbon materials derived from chitosan/cellulose cryogel-supported zeolite imidazole frameworks for potential supercapacitor application

Preparation and adsorption capacity evaluation of graphene oxide-chitosan composite hydrogels

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