Gas-driven exfoliation for producing high-quality graphene

Zhang, Zhiliang; Jin, Hailun; Miao, Xinfeng; Ju, Ting; Li, Yang; Ji, Jianbing

doi:10.1039/c9cc03159f

Cited by 13 publications

(14 citation statements)

References 21 publications

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“…After the final step of sonication, 2% production of SLGFs can be obtained in one run, compared with the previous method that produced ∼1 wt % of monolayer graphene. 10 Although to some extent, this new method is not superior to a few monolayer production methods such as by energy-intensive gas-driven exfoliation (62%) 14 or solution-state exfoliation by MI (∼93%), 23 the obtained SLGFs herein are defect-free by a simple, energy-efficient, and green method that is much better than those prepared by the extremely strong exfoliation. On the other hand, a strong sonication of the as-received natural graphite or P-graphite without microwave exfoliation only produces a few layer graphene flakes with a low concentration of 5.1 ± 0.86 and 3.8 ± 0.4 μg/mL, respectively.…”

Section: Resultsmentioning

confidence: 93%

Defect-Free Single-Layer Graphene by 10 s Microwave Solid Exfoliation and Its Application for Catalytic Water Splitting

Bayazit

Xiong

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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Mass production of defect-free single-layer graphene flakes (SLGFs) by a cost-effective approach is still very challenging. Here, we report such single-layer graphene flakes (SLGFs) (>90%) prepared by a nondestructive, energy-efficient, and easy up-scalable physical approach. These high-quality graphene flakes are attributed to a novel 10 s microwave-modulated solid-state approach, which not only fast exfoliates graphite in air but also self-heals the surface of graphite to remove the impurities. The fabricated high-quality graphene films (∼200 nm) exhibit a sheet resistance of ∼280 Ω/sq without any chemical or physical post-treatment. Furthermore, graphene-incorporated Ni–Fe electrodes represent a remarkable ∼140 mA/cm 2 current for the catalytic water oxidation reaction compared with the pristine Ni–Fe electrode (∼10 mA/cm 2 ) and a 120 mV cathodic shift in onset potential under identical experimental conditions, together with a faradic efficiency of >90% for an ideal ratio of H 2 and O 2 production from water. All these excellent performances are attributed to extremely high conductivity of the defect-free graphene flakes.

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Section: Resultsmentioning

confidence: 93%

Defect-Free Single-Layer Graphene by 10 s Microwave Solid Exfoliation and Its Application for Catalytic Water Splitting

Bayazit

Xiong

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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“…For instance, the low efficiency of adhesive peeling results in low yield [1,17], which only meets the needs of laboratory research. In recent years, supercritical fluid (SCF) exfoliation [58], wet-jet milling exfoliation [59], and gas-driven exfoliation [60] have been developed, which are more efficient. Wang et al [58] produced graphene at high-efficiency by supercritical CO 2 exfoliation with rapid expansion.…”

Section: Preparation Methods Of Graphenementioning

confidence: 99%

“…Wang et al [58] produced graphene at high-efficiency by supercritical CO2 exfoliation with rapid expansion. Zhang et al [60] used a high sheer rate of up to 3.3 × 10 7 s −1 generated by driving high-speed gas at working pressures as low as 0.5 MPa to exfoliate graphite; the microscopic morphology and size changes of the stripped graphene are shown in Figure 3. Figure 3 shows that 62% of the obtained graphene sheets are single-layer, while 97% of flakes are ≤2 layers, with no lattice defect and high quality.…”

Section: Preparation Methods Of Graphenementioning

confidence: 99%

Graphene Synthesis: Method, Exfoliation Mechanism and Large-Scale Production

et al. 2021

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Graphene is a unique attractive material owing to its characteristic structure and excellent properties. To improve the preparation efficiency of graphene, reduce defects and costs, and meet the growing market demand, it is crucial to explore the improved and innovative production methods and process for graphene. This review summarizes recent advanced graphene synthesis methods including “bottom-up” and “top-down” processes, and their influence on the structure, cost, and preparation efficiency of graphene, as well as its peeling mechanism. The viability and practicality of preparing graphene using polymers peeling flake graphite or graphite filling polymer was discussed. Based on the comparative study, it is potential to mass produce graphene with large size and high quality using the viscoelasticity of polymers and their affinity to the graphite surface.

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“…An extreme shear rate of up to 3.3 Â 10 7 s À1 was inferred at working pressures as low as 0.5 MPa. [97] Nevertheless, the calculated yield is still low, about 1.5%. The low yield is likely due to the fact that the extreme shear rates were found to be concentrated at the edges of the tube at the outlet.…”

Section: Shear Stress Exfoliationmentioning

confidence: 96%

A critical review on the production and application of graphene and graphene-based materials in anti-corrosion coatings

Kulyk

Freitas

Santos

et al. 2021

Critical Reviews in Solid State and Materials Sciences

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Among the many potential applications of graphene and graphene-based materials, their use as protective films or as additives in coatings for corrosion protection has seen an increased level of interest in the last decade. Much of this interest is motivated by the need to implement additional functionalities, to enhance anti-corrosion performance and to ultimately extend the service life of metallic structures. Pristine graphene films, with their impermeable nature allied to flexibility and mechanical strength, appear as particularly attractive candidates for barrier films against corrosive agents, while graphene-based materials such as graphene oxide and reduced graphene oxide offer a wide range of opportunities for their dispersion in polymeric matrices for composite anti-corrosive coatings. Simultaneously, considerable progress in the development of scalable graphene and graphene-based materials production techniques has been made during the last several years. Currently, a broad range of graphene materials with different morphologies and properties is available, making the need for an adequate fit between the production method and the desired application even more evident. This review article aims to give the reader a general overview of the recent trends in both the production of graphene and graphene-based materials, and their implementation in different anti-corrosion solutions. Moreover, the present work provides a critical look on this subject, highlighting the areas in need of further exploration.

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Gas-driven exfoliation for producing high-quality graphene

Abstract: A novel simple gas-driven exfoliation method with mild operating conditions is explored for producing high-quality graphene.

Cited by 13 publications

References 21 publications

Defect-Free Single-Layer Graphene by 10 s Microwave Solid Exfoliation and Its Application for Catalytic Water Splitting

Defect-Free Single-Layer Graphene by 10 s Microwave Solid Exfoliation and Its Application for Catalytic Water Splitting

Graphene Synthesis: Method, Exfoliation Mechanism and Large-Scale Production

A critical review on the production and application of graphene and graphene-based materials in anti-corrosion coatings

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