Supercapacitor performances of thermally reduced graphene oxide

Zhao, Bing; Liu, Peng; Jiang, Yong; Pan, Dengyu; Tao, Haihua; Song, Jinsong; Fang, Tao; Xu, Wanjian

doi:10.1016/j.jpowsour.2011.09.074

Cited by 404 publications

(270 citation statements)

References 29 publications

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“…S4). The decrease of SSA from the samples reduced for 6 h is understood to be related to the partial overlapping and coalescence of srGO sheets [24]. Because the 3D macroporous srGO macrostructures are framed within sparse networks of thin, few-layered GO sheets by the ice-templating assembly, the relatively low SSA values of the samples are attributed to the high porosity contributed by macropores between the thin GO walls.…”

Section: Surface Chemistry Of 3d Macroporous Srgo-based Sorbentsmentioning

confidence: 96%

Sorption behavior of slightly reduced, three-dimensionally macroporous graphene oxides for physical loading of oils and organic solvents

Park¹,

Kang²

2016

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High pollutant-loading capacities (up to 319 times its own weight) are achieved by threedimensional (3D) macroporous, slightly reduced graphene oxide (srGO) sorbents, which are prepared through ice-templating and consecutive thermal reduction. The reduction of the srGO is readily controlled by heating time under a mild condition (at 1 10 -2 Torr and 200°C). The saturated sorption capacity of the hydrophilic srGO sorbent (thermally reduced for 1 h) could not be improved further even though the samples were reduced for 10 h to achieve the hydrophobic surface. The large meso-and macroporosity of the srGO sorbent, which is achieved by removing the residual water and the hydroxyl groups, is crucial for achieving the enhanced capacity. In particular, a systematic study on absorption parameters indicates that the open porosity of the 3D srGO sorbents significantly contributes to the physical loading of oils and organic solvents on the hydrophilic surface. Therefore, this study provides insight into the absorption behavior of highly macroporous graphene-based macrostructures and hence paves the way to development of promising next-generation sorbents for removal of oils and organic solvent pollutants.

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Section: Surface Chemistry Of 3d Macroporous Srgo-based Sorbentsmentioning

confidence: 96%

Sorption behavior of slightly reduced, three-dimensionally macroporous graphene oxides for physical loading of oils and organic solvents

Park¹,

Kang²

2016

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“…Thus, Nitrogen is theoretically predicted to substitute O,since it can fit well in the O site [16].Theoretically, Michael J. McAllister, et al [17] postulated that a pressure of only 2.5 Mpa is necessary to separate two stacked graphene oxide platelets. The high temperature nitrogen gas creates the required enormous pressure within the stacked layers.Recently, Bing Zhao, et al [18] illustrated that with increasing the annealing temperature of nitrogen annealed graphene, the structural characterization of graphene were enhanced and their best result were at 900C. In this work, we concern in high temperature nitrogen annealing of a superior typically hexagonal GO nano sheets at 950C.…”

Section: Introductionmentioning

confidence: 93%

“…Thermally exfoliated GO is desirable because of: (i) its scalability; (ii) its sustainability, since it avoids the use of chemicals; (iii) TRGO has higher specific surface area with less agglomeration [15], and (iv) its simplicity since the exfoliation of the GO and its reduction to graphene occurs all in one step. Moreover, the graphene like materials obtained by thermal reduction are electrically conducting, thus it can be used in electrical transport applications.…”

Section: Introductionmentioning

confidence: 99%

Structural and capacitive characterizations of high temperature nitrogen annealed graphene oxide

Fouda¹,

Abu-Assy²,

Yousf³

2014

IOSRJAP

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“…Supercapacitors are attractive devices for such a purpose because of their high power density, long cycle life, low maintenance, wide range of operating temperatures, and fast charging time compared to conventional capacitors and batteries [1][2][3][4][5]. Supercapacitors can be divided into two general classes characterized by their unique mechanism for storing charge.…”

mentioning

confidence: 99%

“…The three types of RGOsponges in Fig. 1b-d show the mechanical flexibility of each http://carbonlett.org GO, and a decrease in the size of the in-plane sp 2 domains by a reduction of the oxygen-functional groups of GO [15].…”

mentioning

confidence: 99%

Comparative study on various sponges as substrates for reduced graphene oxide-based supercapacitor

Choi¹,

Kim²

2016

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To solve environmental problems and address the exhaustion of fossil fuel resources, the development of environmentally friendly and alternative energy storage devices has attracted much interest. Supercapacitors are attractive devices for such a purpose because of their high power density, long cycle life, low maintenance, wide range of operating temperatures, and fast charging time compared to conventional capacitors and batteries [1][2][3][4][5]. Supercapacitors can be divided into two general classes characterized by their unique mechanism for storing charge. The first class includes electrochemical double layer capacitors (EDLCs), which store a charge electrostatically or non-faradically, when the charge is distributed over surfaces through physical processes. EDLCs generally operate with stable capacitive performance for many charge-discharge cycles because there are no chemical or compositional changes. The second class is called pseudocapacitors. These store a charge faradically through redox reactions and electrosorption at the surface of a suitable electrode. Pseudocapacitors can achieve greater energy densities than EDLCs [5][6][7][8]. Graphene materials, which consist of a few atomic layers of only graphite, have attracted great interest as novel electrode materials for energy storage devices because of their superior properties and advantages, such as high electrical and thermal conductivity, great mechanical strength, large specific surface area, and low manufacturing cost [9][10][11][12][13]. In this work, reduced graphene oxide (RGO), obtained through the chemical reduction of graphene oxide (GO), was used as a capacitive material [14][15][16]. Here, sponges similar to the ones used in ordinary life have been employed as supporting substrates for the fabricated supercapacitor electrodes. Sponges have suitable properties for improving capacitive performance, such as good wettability, highly porous structure, and substantial internal surface area. In demonstrations, they have provided smooth accessibility of ions to electrolytes. Among the various sponges easily available on the market, three types have been employed: polyvinyl alcohol (PVA), melamine, and polyurethane (PU) sponges. The capacitive performances of these types of sponge were compared. A facile dip and dry method was demonstrated, using an RGO solution to coat each sponge, to fabricate an RGO-coated sponge (RGO-sponge) electrode without additional binder and or conductive materials [17][18][19].

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Supercapacitor performances of thermally reduced graphene oxide

Cited by 404 publications

References 29 publications

Sorption behavior of slightly reduced, three-dimensionally macroporous graphene oxides for physical loading of oils and organic solvents

Sorption behavior of slightly reduced, three-dimensionally macroporous graphene oxides for physical loading of oils and organic solvents

Structural and capacitive characterizations of high temperature nitrogen annealed graphene oxide

Comparative study on various sponges as substrates for reduced graphene oxide-based supercapacitor

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