Preparation and characterization of carbon-sulfur surface compounds

Chin, Hock-Chun

doi:10.1016/0008-6223(81)90040-3

Cited by 67 publications

(22 citation statements)

References 20 publications

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“…The weight loss associated with the decomposition is less than 50 %o f that in GO, and the epoxy groups of GO remaining in the composite are slightly more thermally stable than those in the parentG O. [36] Interestingly for the CP-AO carbon, the m/z signal representing sulfur functionalities has av ery low intensity,w hich suggests decomposition of sulfur-containing moieties during heat treatment. The differential thermogravimetric (DTG) curve for CP shows the presence of mainly carboxyl groups decomposinga sabroad peak between T = 200 and 450 8Cw ith well-definedm axima at T = 220 and 290 8C, which represent acidic species such as carboxylic acids.…”

Section: Resultsmentioning

confidence: 95%

Peculiar Properties of Mesoporous Synthetic Carbon/Graphene Phase Composites and their Effect on Supercapacitive Performance

2015

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Composites of mesoporous synthetic carbon and the graphene phase were synthesized in aqueous suspension by employing dispersive interactions of both phases. The resulting carbon-based materials were further heat treated in air at 350 °C. The composites and their components were characterized by using adsorption of nitrogen, potentiometric titration, thermal analysis-mass spectrometry, X-ray photoelectron spectroscopy, SEM, high-resolution TEM, and XRD. Then, they were tested as supercapacitors in three-electrode cells and under visible-light irradiation. The composites and the initial carbon share exactly the same pore-size distributions, but they exhibit significant differences in their surface chemistry, wettability, and conductivity. This allowed us to determine the extent of their effects on their capacitive/pseudocapacitive performance. The results showed that features other than the textural properties can increase the capacitive performance by more than 100 %. The synergistic properties of the composites and their sulfur functional group related photoactivity were linked to chemical interactions between the nanoporous carbon phase and graphite oxide during the formation of the composite.

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Section: Resultsmentioning

confidence: 95%

Peculiar Properties of Mesoporous Synthetic Carbon/Graphene Phase Composites and their Effect on Supercapacitive Performance

2015

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“…having a total of three bonds to oxygen in carboxylic groups (COOH/R) [44][45][46]. C-S bonds cannot be distinguished from C-C bonds because of the similarity in electronegativity between sulfur and carbon [47]. Comparing the intensity of the C1s peaks before and after sulfonation (table S1), the decrease of the peak at 285.7 eV and the increase of peak at 287 eV could be attributed to the strong oxidising ability of H 2 SO 4 treatment which generates more carbonyl and carboxylate groups from hydroxyl groups.…”

Section: Resultsmentioning

confidence: 99%

The formation of a hydrothermal carbon coating on graphite microfiber felts for using as structured acid catalyst

Roldán¹,

Santos²,

Armenise³

et al. 2012

Carbon

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A hydrothermal carbon layer has been coated on graphite felt using a carbohydrate solution (glucose, sucrose or starch) as precursor. The coating is uniform in thickness and coverage, and exhibits excellent adhesion to the substrate. It is highly hydrophilic, very accessible to reactants and the thickness can be tuned by the synthesis conditions. The coating was functionalized with sulfonic acid groups and its morphology and surface chemistry characterized by SEM, TPO-MS, IR-spectroscopy and XPS. The sulfonated material has been tested in the esterification of palmitic acid with methanol exhibiting significant activity and stability.

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“…Chang Chin has shown that sulfur chemically bounded to carbon in the form of C x S compounds characterized by XPS gives a S2p 3/2 peak at 163.7 eV [14]. Labib et al have attributed this signal to lower oxidation state sulfur bounded directly to the graphitic ring structure or as inclusion in the ring structure [15].…”

Section: Discussionmentioning

confidence: 98%

“…It would be beneficial if thiols could be adsorbed on carbon, a less expensive substrate. However, there are only a few reports on the adsorption of organic thiols on carbon [10][11][12][13][14][15]. One study reported the spontaneous adsorption of alkylthiols on carbon nanotubes via a reaction with Stones-Wales defects [10].…”

Section: Introductionmentioning

confidence: 98%