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Journal ArticleDOI

Spontaneous exfoliation of large-sized graphene oxide with low defect concentration by simple wet chemistry

Woo-Jin Lee1, Chan-soo Kim1, Seung-Yeol Yang1, Dongwook Lee1, Yong-Seog Kim1 
01 Sep 2021-Carbon (Pergamon)-Vol. 182, pp 214-222
TL;DR: In this paper, the same authors proposed a simple wet chemistry-based methodology reported here paves a way to facile and scaled-up production of large-sized GOs with low defect concentration.
About: This article is published in Carbon.The article was published on 2021-09-01. It has received 9 citations till now. The article focuses on the topics: Exfoliation joint & Graphene.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a glue-assisted grinding exfoliation (GAGE) method was proposed to produce 2D materials with large lateral sizes, high quality, and high yield, including graphene, MoS2, WS2, Bi2O2Se, mica, vermiculite and montmorillonite.

35 citations

Journal ArticleDOI
TL;DR: In this article , a tortuous nanostructured thin film consisting of reduced graphene oxide (rGO) sheets was constructed to achieve a water vapor transmission rate of 4.1 × 10−5 g/m2·day and lag time of 1 month (730 h).

3 citations

Journal ArticleDOI
TL;DR: In this article , an oxygen-containing functional groups rich/defect-rich graphene oxide (D-GO) with large size and porous network structure is developed, which exhibits outstanding adsorption ability to S and Li2Sn.
Abstract: Lithium–sulfur (Li–S) battery has promising application prospect owing to the high energy density. Yet, its cycling life and Coulombic efficiency are always low due to shuttle effect of the mid-product, Li2Sn (4 ≤ n ≤ 8), on the cathode. Herein, oxygen-containing functional groups rich/defect-rich graphene oxide (D-GO) with large size and porous network structure is developed, which exhibits outstanding adsorption ability to S and Li2Sn. S can be uniformly deposited onto the D-GO ([email protected]), and the proportion of S is as high as 89.5 wt% in the composite. As cathode of Li–S batteries, the [email protected] can deliver a high capacity of 1370 mAh/g at 0.05 C. The capacity is still as high as 1011 mAh/g at 1 C, and 95% of the initial value is remained after 400 cycles' cycling, exhibiting good rate performance and cycling stability. Meanwhile, the Coulombic efficiency is close to 100% during the whole test, suggesting that the D-GO can inhibit the shuttle of polysulfide effectively. Most important, with a high loading amount of 14.8 mg/cm2 for the [email protected], areal capacity of the cathode still can reach 14.85 mAh/cm2 at 0.1 C, indicating high practical and commercial value in energy storage field.

2 citations

Journal ArticleDOI
TL;DR: In this paper , a collaborative control strategy of monodisperse MoS2/graphite composites was utilized and studied in detail, where the graphite sheets were uniformly dispersed between the molybdenum disulfide sheets by the ball-milling process, which effectively reduced the agglomeration and simultaneously improved the electrical conductivity of the composite.
Abstract: Traditional graphite anode material typically shows a low theoretical capacity and easy lithium decomposition. Molybdenum disulfide is one of the promising anode materials for advanced lithium-ion batteries, which possess low cost, unique two-dimensional layered structure, and high theoretical capacity. However, the low reversible capacity and the cycling-capacity retention rate induced by its poor conductivity and volume expansion during cycling blocks further application. In this paper, a collaborative control strategy of monodisperse MoS2/graphite composites was utilized and studied in detail. MoS2/graphite nanocomposites with different ratios (MoS2:graphite = 20%:80%, 40%:60%, 60%:40%, and 80%:20%) were prepared by mechanical ball-milling and low-temperature annealing. The graphite sheets were uniformly dispersed between the MoS2 sheets by the ball-milling process, which effectively reduced the agglomeration of MoS2 and simultaneously improved the electrical conductivity of the composite. It was found that the capacity of MoS2/graphite composites kept increasing along with the increasing percentage of MoS2 and possessed the highest initial discharge capacity (832.70 mAh/g) when MoS2:graphite = 80%:20%. This facile strategy is easy to implement, is low-cost, and is cosmically produced, which is suitable for the development and manufacture of advance lithium-ion batteries.

1 citations

References
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Journal ArticleDOI
TL;DR: This review will be of value to synthetic chemists interested in this emerging field of materials science, as well as those investigating applications of graphene who would find a more thorough treatment of the chemistry of graphene oxide useful in understanding the scope and limitations of current approaches which utilize this material.
Abstract: The chemistry of graphene oxide is discussed in this critical review Particular emphasis is directed toward the synthesis of graphene oxide, as well as its structure Graphene oxide as a substrate for a variety of chemical transformations, including its reduction to graphene-like materials, is also discussed This review will be of value to synthetic chemists interested in this emerging field of materials science, as well as those investigating applications of graphene who would find a more thorough treatment of the chemistry of graphene oxide useful in understanding the scope and limitations of current approaches which utilize this material (91 references)

10,126 citations

Journal ArticleDOI
22 Jul 2010-ACS Nano
TL;DR: An improved method for the preparation of graphene oxide (GO) is described, finding that excluding the NaNO(3), increasing the amount of KMnO(4), and performing the reaction in a 9:1 mixture of H(2)SO(4)/H(3)PO(4) improves the efficiency of the oxidation process.
Abstract: An improved method for the preparation of graphene oxide (GO) is described. Currently, Hummers’ method (KMnO4, NaNO3, H2SO4) is the most common method used for preparing graphene oxide. We have found that excluding the NaNO3, increasing the amount of KMnO4, and performing the reaction in a 9:1 mixture of H2SO4/H3PO4 improves the efficiency of the oxidation process. This improved method provides a greater amount of hydrophilic oxidized graphene material as compared to Hummers’ method or Hummers’ method with additional KMnO4. Moreover, even though the GO produced by our method is more oxidized than that prepared by Hummers’ method, when both are reduced in the same chamber with hydrazine, chemically converted graphene (CCG) produced from this new method is equivalent in its electrical conductivity. In contrast to Hummers’ method, the new method does not generate toxic gas and the temperature is easily controlled. This improved synthesis of GO may be important for large-scale production of GO as well as the ...

9,812 citations

Journal ArticleDOI
TL;DR: An overview of the synthesis, properties, and applications of graphene and related materials (primarily, graphite oxide and its colloidal suspensions and materials made from them), from a materials science perspective.
Abstract: There is intense interest in graphene in fields such as physics, chemistry, and materials science, among others. Interest in graphene's exceptional physical properties, chemical tunability, and potential for applications has generated thousands of publications and an accelerating pace of research, making review of such research timely. Here is an overview of the synthesis, properties, and applications of graphene and related materials (primarily, graphite oxide and its colloidal suspensions and materials made from them), from a materials science perspective.

8,919 citations

Journal ArticleDOI
27 Jan 2012-Science
TL;DR: Submicrometer-thick membranes made from graphene oxide can be completely impermeable to liquids, vapors, and gases, including helium, but these membranes allow unimpeded permeation of water (H2O permeates through the membranes at least 1010 times faster than He).
Abstract: Permeation through nanometer pores is important in the design of materials for filtration and separation techniques and because of unusual fundamental behavior arising at the molecular scale. We found that submicrometer-thick membranes made from graphene oxide can be completely impermeable to liquids, vapors, and gases, including helium, but these membranes allow unimpeded permeation of water (H 2 O permeates through the membranes at least 10 10 times faster than He). We attribute these seemingly incompatible observations to a low-friction flow of a monolayer of water through two-dimensional capillaries formed by closely spaced graphene sheets. Diffusion of other molecules is blocked by reversible narrowing of the capillaries in low humidity and/or by their clogging with water.

2,602 citations

Journal ArticleDOI
01 Nov 2013-Carbon
TL;DR: In this paper, an improved Hummers method without using NaNO3 can produce graphene oxide nearly the same to that prepared by conventional Hummers methods, which does not decrease the yield of product and simplifies the disposal of waste water because of the inexistence of Na+ and NO3− ions.

1,683 citations