Synthesis of graphene paper from pyrolyzed asphalt

Cheng, I. Francis; Xie, Yuqun; Gonzales, R. Allen; Brejna, Przemysław R.; Sundararajan, Jency Pricilla; Kengne, B.A. Fouetio; Aston, D. Eric; McIlroy, David N.; Foutch, Jeremy D.; Griffiths, Peter R.

doi:10.1016/j.carbon.2011.03.020

Cited by 87 publications

(59 citation statements)

References 52 publications

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“…The peak settled at approximately 2θ=23.5° is known as the multilayered graphene, not at the 2θ ~26° observed in the literature [32], probably due to the weak bond between the carbon layers. The multilayered graphene is produced by stacking aromatic molecules in the asphalt reaction process [33]. The presence of graphene was also supported by a weak peak at 2θ=42.25°, which is due to the influence of asphaltene in the nearest neighbors in the ring structure, as supported by previous studies [34,35].…”

Section: Resultssupporting

confidence: 73%

Synthesis and characterization of asphalt composite precursors using amorphous rice husk silica

2019

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In this research, asphalt composites were produced by mixing asphalt with silica extracted from rice husk, with a ratio of asphalt to silica of 1:0, 1:1.7 and 1:2, and calcined at 150 °C. Development of structures was characterized using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), followed by differential thermal analysis (DTA/TGA). The FTIR results showed the presence of Si-OH, C=O, and C-H functional groups, which were associated with asphaltene, carbon, and silica, according to the XRD analysis. The results obtained also indicated the significant effect of rice husk silica addition on phase transformation of asphaltene into silica and carbon, while asphaltene molecules were practically undetected. The presence of silica and carbon resulted in increased decomposition temperature of the sample. Based on these characteristics, the samples were considered as a roof material, suggesting their potential use as a substitute for lightweight steel roof devices.

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Section: Resultssupporting

confidence: 73%

Synthesis and characterization of asphalt composite precursors using amorphous rice husk silica

2019

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“…These electrodes offer cost effectiveness but suffer from slow V 3+/2+ HET rates and from significant parasitic hydrogen evolution [17,29]. In previous investigations GUITAR exhibited facile HET rates with Fe(CN) 6 3´/4á nd Ru(NH 3 ) 6 2+/3+ redox couples [22,30]. In this investigation, we assess the HET rate constant for V 3+/2+ redox system and contribution of hydrogen evolution on the overall voltammetric current on GUITAR flake, KFD graphite felt and GUITAR coated KFD graphite felt electrodes.…”

Section: Introductionmentioning

confidence: 99%

Application of GUITAR on the Negative Electrode of the Vanadium Redox Flow Battery: Improved V3+/2+ Heterogeneous Electron Transfer with Reduced Hydrogen Gassing

Kabir

Gyan

Foutch

et al. 2016

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GUITAR (Graphene from the University of Idaho Thermolyzed Asphalt Reaction) has the classical basal and edge plane morphology of graphites and thin layer graphenes with similar X-ray photoelectron spectroscopy (XPS), Raman and IR characteristics. However previous investigations indicated GUITAR is different electrochemically from graphenes and classical graphites. GUITAR has faster heterogeneous electron transfer across its basal plane and an electrochemical window that exceeds graphitic materials by 1 V. These beneficial properties are examined for application in the negative electrode of the vanadium redox flow battery (VRFB). Graphitic materials in this application suffer from hydrogen gassing and slow electron transfer kinetics for the V 2+/3+ redox couple. Cyclic voltammetry of the V 2+/3+ redox couple (0.05 M V 3+ in 1 M H 2 SO 4) on bare KFD graphite felt gives an estimated standard rate constant (k 0) of 8.2ˆ10´7 cm/s. The GUITAR-coated KFD graphite felt improves that quantity to 8.6ˆ10´6 cm/s. The total contribution of the cyclic voltammetric currents at´1.0 V vs. Ag/AgCl to hydrogen evolution is 3% on GUITAR-coated KFD graphite felt. On bare KFD graphite felt, this is 22%. These results establish GUITAR as an excellent alternative material for the negative electrode in the vanadium redox flow battery.

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“…Since the thickness of ideal single-layer graphene is approximately 0.34 nm [14], the present graphene sheet may represent three layers of graphene according to the three-layer graphene with height~1.9 nm by Li et al [15]. Furthermore, the RMS (root mean square) roughness estimated with AFM data is 0.31 nm over a 60 μm 2 area [16], reflecting an overall smooth surface of the graphene plane [17].…”

Section: Resultsmentioning

confidence: 94%

Preparation of Three-Layer Graphene Sheets from Asphaltenes Using a Montmorillonite Template

et al. 2019

Journal of Nanomaterials

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We propose a novel approach to synthesize graphene sheets with fine quality by calcinating the composites intercalated with montmorillonite (MMT) and asphaltene. The graphene sample thus fabricated could reach 10.79 μm long, with smooth and continuous morphology and with little defects. By analyzing the XRD patterns of graphene/MMT composites at different conditions, the graphene formation mechanism is elucidated and the optimal calcination conditions are researched. This study may provide useful insights for low-cost and scalable fabrication of graphene from asphaltene extracted from heavy crude oil.

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Synthesis of graphene paper from pyrolyzed asphalt

Cited by 87 publications

References 52 publications

Synthesis and characterization of asphalt composite precursors using amorphous rice husk silica

Synthesis and characterization of asphalt composite precursors using amorphous rice husk silica

Application of GUITAR on the Negative Electrode of the Vanadium Redox Flow Battery: Improved V3+/2+ Heterogeneous Electron Transfer with Reduced Hydrogen Gassing

Preparation of Three-Layer Graphene Sheets from Asphaltenes Using a Montmorillonite Template

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