Effect of the graphite oxide composition on the structure of products obtained by sulfuric acid treatment at elevated temperatures

Stolyarova, Svetlana G.; Kobeleva, Elena S.; Asanov, I. P.; Окотруб, А. В.; Bulusheva, L. G.

doi:10.1134/s0022476617060166

Cited by 12 publications

(13 citation statements)

References 24 publications

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“…To obtain HG, the GO (1 g) was placed into a flask with 200 mL of concentrated H 2 SO 4 and heated at 280 °C for 1 h . The resulting black precipitate was washed with water, dried in air, and annealed in an argon flow at 800 °C for 1 h.…”

Section: Methodsmentioning

confidence: 99%

High‐Pressure High‐Temperature Synthesis of MoS₂/Holey Graphene Hybrids and Their Performance in Li‐Ion Batteries

Stolyarova

Kanygin

Koroteev

et al. 2017

Physica Status Solidi (b)

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Hybrids of holey graphene (HG) and MoS 2 have been prepared by a treatment of few-layered HG and amorphous MoS 3 , taken in a weight ratio of %5 and %10%, at 100 bar and 600 C under vacuum. A study of the products by electron microscopy, X-ray diffraction, Raman scattering, and X-ray photoelectron spectroscopy has detected coating of graphene stacks by thin MoS 2 layers. The near-edge X-ray absorption fine structure spectroscopy has revealed a covalent bonding between MoS 2 and HG components. A hybrid with 5 wt.% of MoS 2 showed a better rate capability for Li-ion intercalation/ deintercalation as compared to the isolated HG and a hybrid with a higher MoS 2 loading. Owing to the electrochemical impedance spectroscopy measurements, this was attributed to a faster charge transport in the hybrid with the thin MoS 2 coating.

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Section: Methodsmentioning

confidence: 99%

High‐Pressure High‐Temperature Synthesis of MoS₂/Holey Graphene Hybrids and Their Performance in Li‐Ion Batteries

Stolyarova

Kanygin

Koroteev

et al. 2017

Physica Status Solidi (b)

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“…Stolyarova et al have proposed the mechanism of the pore development in MPCs, as treated with hot concentrated H 2 SO 4 . The schematic is illustrated in Scheme .…”

Section: Resultsmentioning

confidence: 99%

“…While further heating, the carboxyl groups may decompose to release CO 2 . Accordingly, the protons left in the carbon matrix render the vacancies enlarged at the sites of aggregation of hydroxyl and epoxy groups; such a result is more likely to happen for highly oxidized graphites …”

Section: Resultsmentioning

confidence: 99%

Functionalized Mesoporous Carbon Nanostructures for Efficient Removal of Eriochrome Black-T from Aqueous Solution

Veerakumar

Jeyapragasam²,

Surabhi³

et al. 2019

J. Chem. Eng. Data

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Acid-functionalized mesoporous carbons (AF-MPCs) have been synthesized and used as adsorbents for removal of an azo dye, Eriochrome Black-T (EBT), from aqueous solution. To generate acid surface functionalities, mesoporous carbons (MPCs) were treated with sulfuric acid. Characterization of the samples was analyzed by XRD, Raman spectra, N2 adsorption–desorption, FE-TEM, TGA, and FT-IR studies. The adsorption studies were carried out under various parameters, such as pH, adsorbent dosage, contact time, initial dye concentration solution temperature, and salt concentration. The results showed that the EBT adsorption onto samples was affected by the pH of solution; the maximum EBT ion adsorption took place at pH 1; and the adsorption uptake was increased with an increase in the initial dye concentration. Moreover, the mechanism of adsorption was investigated using kinetic, diffusion, and isotherm models. The best fit was obtained by the Langmuir model with high correlation coefficients (R 2 = 0.9463) with a maximum monolayer adsorption capacity of 117.0 mg·g–1. The adsorbed anionic EBT dye molecules were eluted by ethanol solvent with the recovery percentage of 98%. Moreover, this study demonstrates that AF-MPCs can be successfully used as a low-cost adsorbent for the removal of EBT from aqueous solutions.

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“…Graphite oxide (GO) was synthesized using the modified Hummer's method, which is described in details elsewhere . For the creation of holes in graphene layers, the GO (2 g) was placed into a flask with 200 mL of concentrated H 2 SO 4 , and the mixture was heated to 280 °C and held at this temperature for 1 h. The black precipitate was washed with water, dried in the air, and annealed in an argon flow at 800 °C for 1 h for the removal of residual oxygen .…”

Section: Methodsmentioning

confidence: 99%

Pressure‐Assisted Interface Engineering in MoS₂/Holey Graphene Hybrids for Improved Performance in Li‐ion Batteries

et al. 2019

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The interface between MoS2 and carbon components plays an important role in the performance of the hybrid material in Li‐ion batteries. To enhance the interfacial interactions, holey graphene (HG) layers are used as a support for the forming MoS2, and the compression of components is used during the synthesis. Initial compositions, obtained by deposition of MoS3 on the surface of HG stacks, are annealed at 400–600 °C and 100 bar. Using a set of characterization methods, the synthesis products are studied and it is found that the hole boundaries anchor MoS2 via covalent C–Mo coupling, while the applied pressure assists in the development of a thin MoS2 coating. The number of layers and their lateral dimensions are dependent on the synthesis temperature. The tests of Li‐ion half‐cells detected higher values of specific capacity for MoS2/HG hybrids synthesized under compression. Enhanced interaction between the components prevents the destruction of MoS2 during discharging–charging of electrodes, and the capacity increases due to the accommodation of lithium between the layers of MoS2 and HG. The structural features of MoS2/HG hybrids stipulate growth of specific capacity with long‐term cycling to ≈1200 mA h g−1 at a current density of 0.5 A g−1.

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Effect of the graphite oxide composition on the structure of products obtained by sulfuric acid treatment at elevated temperatures

Cited by 12 publications

References 24 publications

High‐Pressure High‐Temperature Synthesis of MoS₂/Holey Graphene Hybrids and Their Performance in Li‐Ion Batteries

High‐Pressure High‐Temperature Synthesis of MoS₂/Holey Graphene Hybrids and Their Performance in Li‐Ion Batteries

Functionalized Mesoporous Carbon Nanostructures for Efficient Removal of Eriochrome Black-T from Aqueous Solution

Pressure‐Assisted Interface Engineering in MoS₂/Holey Graphene Hybrids for Improved Performance in Li‐ion Batteries

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Effect of the graphite oxide composition on the structure of products obtained by sulfuric acid treatment at elevated temperatures

Cited by 12 publications

References 24 publications

High‐Pressure High‐Temperature Synthesis of MoS2/Holey Graphene Hybrids and Their Performance in Li‐Ion Batteries

High‐Pressure High‐Temperature Synthesis of MoS2/Holey Graphene Hybrids and Their Performance in Li‐Ion Batteries

Functionalized Mesoporous Carbon Nanostructures for Efficient Removal of Eriochrome Black-T from Aqueous Solution

Pressure‐Assisted Interface Engineering in MoS2/Holey Graphene Hybrids for Improved Performance in Li‐ion Batteries

Contact Info

Product

Resources

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High‐Pressure High‐Temperature Synthesis of MoS₂/Holey Graphene Hybrids and Their Performance in Li‐Ion Batteries

High‐Pressure High‐Temperature Synthesis of MoS₂/Holey Graphene Hybrids and Their Performance in Li‐Ion Batteries

Pressure‐Assisted Interface Engineering in MoS₂/Holey Graphene Hybrids for Improved Performance in Li‐ion Batteries