Large-scale production of high-quality graphene sheets by a non-electrified electrochemical exfoliation method

Shi, Pengcheng; Guo, Jipeng; Liang, Xin; Cheng, Sheng; Zheng, Hao; Wang, Y.; Chen, C.H.; Xiang, Hongfa

doi:10.1016/j.carbon.2017.10.071

Cited by 81 publications

(32 citation statements)

References 56 publications

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“…The absorption peak near 1750 cm −1 was caused by stretching vibrations of C=O at the edge of the GO, the absorption peak near 1630 cm −1 was caused by stretching vibrations of the C=C bond on the surface of the GO. The absorption peaks between 1500 and 1000 cm −1 were due to –OH (1410 cm −1 ), C–O–C (1240 cm −1 ), and C–O–H (1080 cm −1 ) vibrations, respectively [38]. After annealing, the C–O–H, C–O–C, C=C, and C=O peaks nearly disappeared.…”

Section: Resultsmentioning

confidence: 99%

Improved Performance of Graphene in Heat Dissipation when Combined with an Orientated Magnetic Carbon Fiber Skeleton under Low-Temperature Thermal Annealing

Lei

Lai

et al. 2019

Materials

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The high thermal conductivity and stability, outstanding mechanical properties, and low weight make graphene suitable for many applications in the realm of thermal management, especially in high integration systems. Herein, we report a high-performance, low-temperature reduced graphene oxide/magnetic carbon fiber composite film. Magnetic carbon fibers were prepared using a co-precipitation method, and the graphene oxide solution was prepared using an improved Hummers’ method. The magnetic carbon fibers were orientated by magnetite and immersed in the graphene oxide solution during filtration, followed by annealing at 800 °C. The composite film exhibited improved thermal conductivity (over 600 W/m·K) and mechanical properties (tensile strength of 37.1 MPa and bending cycle of up to 8000). The experimental results illustrate that the graphene in the composite membrane provides heat transfer channels to promote in-plane thermal conductivity, while the magnetic carbon fiber acts as a scaffold to reinforce the mechanical properties and improve the quality of the graphene. Due to the synergistic effect of the graphene and magnetic carbon, this composite has wide potential applications in heat dissipation.

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Section: Resultsmentioning

confidence: 99%

Improved Performance of Graphene in Heat Dissipation when Combined with an Orientated Magnetic Carbon Fiber Skeleton under Low-Temperature Thermal Annealing

Lei

Lai

et al. 2019

Materials

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“…The Raman characterization showed only a few defects on the surface of graphene (I D /I G = 0.21-0.32), and these defects were distributed at the edge of graphene. Shi et al (2018) demonstrated a non-electrified electrochemical exfoliation method to produce high-quality graphene (NEEG) sheets. By direct electrochemical reaction between graphite powders and metallic Li in 1 M of LiPF 6 /propylene carbonate electrolyte, continuous graphite exfoliation is achieved with a high yield of excess 80% without any consumption of electric energy.…”

Section: Electrochemical Exfoliationmentioning

confidence: 99%

Research Progress of the Liquid-Phase Exfoliation and Stable Dispersion Mechanism and Method of Graphene

Zhou

Jin

et al. 2019

Front. Mater.

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Graphene is a honeycomb hexagonal two-dimensional (2D) crystal nanomaterial with a thickness of only 0.334 nm. It has been widely used and studied because of its ultra-thin 2D nano-characteristics and excellent electrical, thermal, optical, and mechanical properties. With the continuous in-depth study of graphene, the liquid-phase dispersion of graphene has also achieved breakthroughs. This review summarizes the research progress of the liquid-phase exfoliation mechanism, exfoliation method, stable dispersion mechanism, and dispersion method of graphene in recent years. The research situations of the Hamaker constant theory in exfoliation mechanism and Hansen solubility coefficient theory in stable dispersion mechanism are mainly discussed. The shortcomings of the research are summarized and analyzes the graphene liquid phase dispersed in the important challenge in the future. The stable dispersion method of graphene is also summarized. In the future, the π-π interaction will be the most potential method for studying graphene stabilization.

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“…Aer monolayer graphene was successfully prepared by the micro-mechanical peeling method, 27 a variety of preparation methods have been reported, such as the oxidation-reduction method, [28][29][30] chemical vapor deposition, [31][32][33] and chemical synthesis. [34][35][36] In particular, the oxidation-reduction method can efficiently prepare graphene under relatively mild conditions, and the defects and residual oxygen functional groups on the reduction products can improve the activity of the reduced graphene oxide (rGO), which is benecial for expanding its application range. Therefore, as a new kind of nano-ller, graphene has been widely applied to prepare composites.…”

Section: -26mentioning

confidence: 99%

Solvent-assisted thermal reduction of microcrystalline graphene oxide with excellent microwave absorption performance

et al. 2018

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aTo prepare a new kind of electromagnetic wave absorber, and improve the processing technology and accessional value of natural microcrystalline graphite minerals (NMGMs), reduced microcrystalline graphene oxide (rGO-M), a novel absorber with high absorption, low reflection and a wide absorption band, was prepared from NMGMs using a solvent-assisted thermal reduction method. Moreover, the asproduced rGO-M with adjustable electrical resistivity can be easily transferred into well distributed bulk materials by freeze-drying technology. These unique structures and compositions make a great contribution to the impedance match, and cause strong conductive loss and various dipole polarization effects which greatly enhance the absorption. Meanwhile, the effective bandwidths below À5 dB and À10 dB are 11.7 GHz and 3.32 GHz respectively, and the reflection loss can reach À42.68 dB. The study will be beneficial to the development of carbon resources and carbon materials research. Besides, it can provide a scientific basis for the further improvement of the comprehensive utilization and the level of deep processing technology of NMGM resources.

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Large-scale production of high-quality graphene sheets by a non-electrified electrochemical exfoliation method

Cited by 81 publications

References 56 publications

Improved Performance of Graphene in Heat Dissipation when Combined with an Orientated Magnetic Carbon Fiber Skeleton under Low-Temperature Thermal Annealing

Improved Performance of Graphene in Heat Dissipation when Combined with an Orientated Magnetic Carbon Fiber Skeleton under Low-Temperature Thermal Annealing

Research Progress of the Liquid-Phase Exfoliation and Stable Dispersion Mechanism and Method of Graphene

Solvent-assisted thermal reduction of microcrystalline graphene oxide with excellent microwave absorption performance

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