Oxidation of a Graphite Surface: The Role of Water

Boukhvalov, Danil W.

doi:10.1021/jp509659p

Cited by 23 publications

(19 citation statements)

References 92 publications

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“…Projected augmented wave (PAW) method [16] is applied in this work. All calculations are performed using the local density approximation, which is feasible for modeling the graphite surface functionalization [17,18]. Interlayer distance is 3.35 Å by LDA approach and that is in good agreement with experimental value (3.33 Å) [19].…”

Section: Dft Calculation Methodssupporting

confidence: 67%

Experimental analysis and theoretical studies by density functional theory of aminopropyl-modified ordered mesoporous carbon

Geng

Liu

Wang

et al. 2015

Applied Surface Science

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Section: Dft Calculation Methodssupporting

confidence: 67%

Experimental analysis and theoretical studies by density functional theory of aminopropyl-modified ordered mesoporous carbon

Geng

Liu

Wang

et al. 2015

Applied Surface Science

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“…Surprisingly, by applying both CV and NPV close to the oxygen evolution potential (i.e., 0.87 V), XPS spectra show the typical intercalation features again. They are likely due to the oxidation of graphite-linked hydroxyl groups which tend to produce O 2 both at the surface and in the inner layers. , Because part of the hydroxyl group is oxidized, the amount of intercalation is lower compared to higher potentials, where the circulating current is higher, thus allowing for a massive ion intercalation …”

Section: Results and Discussionmentioning

confidence: 99%

Incipient Anion Intercalation of Highly Oriented Pyrolytic Graphite Close to the Oxygen Evolution Potential: A Combined X-ray Photoemission and Raman Spectroscopy Study

Jagadeesh¹,

Bussetti²,

Calloni³

et al. 2018

J. Phys. Chem. C

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In the present work, we used two different electrochemical (EC) techniques, namely, cyclic voltammetry and normal pulsed voltammetry, applied to a highly oriented pyrolytic graphite (HOPG) electrode for anion intercalation in two different aqueous electrolytes (i.e., perchloric and sulphuric acid). We performed comparative X-ray photoemission (XPS) and Raman spectroscopy studies at various EC potentials. The chemical analysis obtained by XPS and Raman spectroscopy, the latter applied in situ and in real time during the EC processes, indicates that at oxygen evolution potential (i.e., before reaching the well-known intercalation stage potentials), the HOPG intercalation process is already active. These results suggest that the intercalated compound is efficiently obtained before reaching higher potentials, which usually cause a detriment of the graphite crystal.

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“…According to SAXS results, the pre‐exfoliation of GrO in water with ultrasound allows the modification of the interlayer spacing to improve the good interaction between the GO and polymeric matrix of starch. The solution at 1 wt % of GrO was chosen for BNCs preparation because better GO monolayer intercalation/exfoliation facilitated a higher water content …”

Section: Resultsmentioning

confidence: 99%

Starch‐graphene oxide bionanocomposites prepared through melt mixing

Ávila‐Orta

Soriano‐Corral

Fonseca‐Florido

et al. 2017

J of Applied Polymer Sci

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Bionanocomposites (BNCs) of waxy corn starch, glycerol, and graphene oxide (GO) or graphite oxide (GrO) were prepared by melt mixing. First, the GrO was pre-exfoliated in a water solution using ultrasound at 1 wt %. Small-angle X-ray scattering was used to determinate the interlaminar separation of GrO and transmission electron microscopy, Fourier infrared spectroscopy, and thermogravimetric analysis were used to characterized the GrO. Next, BNCs were characterized by X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and mechanical property measurements. A complete exfoliation of GrO was obtained in the waxy corn matrix. Amorphous X-ray patterns of the BNCs were observed, indicating that the exfoliated GO avoid the retrogradation of starch. According to scanning electron microscopy results, the BNCs showed an irregular texture and a good dispersion of GO, while thermoplastic starch showed a smooth morphology with a fragile structure. The BNCs exhibited higher thermal stability than thermoplastic starch. The tensile strength and the Young's modulus increased by 140% and 230% at a GO loading levels of 0.5% due to good interfacial interactions of GO and the waxy corn starch matrix.

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Oxidation of a Graphite Surface: The Role of Water

Cited by 23 publications

References 92 publications

Experimental analysis and theoretical studies by density functional theory of aminopropyl-modified ordered mesoporous carbon

Experimental analysis and theoretical studies by density functional theory of aminopropyl-modified ordered mesoporous carbon

Incipient Anion Intercalation of Highly Oriented Pyrolytic Graphite Close to the Oxygen Evolution Potential: A Combined X-ray Photoemission and Raman Spectroscopy Study

Starch‐graphene oxide bionanocomposites prepared through melt mixing

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