Activation of the carbon component of shungite-III and the sorption capacity of the material for hydrogen

Алексеев, Н. И.; Arapov, O. V.; Bodyagin, B. O.; Куденко, В В; Кустова, Е. В.; Samonin, V. V.; Semenov, Konstantin N.; Сироткин, А. К.; Чарыков, Н. А.; Chentsov, M. N.

doi:10.1134/s1070427206090060

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…The settling of efficient purification procedures able to eliminate the silicates and other species present in the pristine SH rock and to obtain a network of pure carbon phase, is undoubtedly a fundamental step preliminary to any other experimental activity. Based on literature considerations about the use of HF or NaOH to eliminate silicates 46 , of HNO 3 or HCl to remove metals, oxides and amorphous carbon 47 , new purification procedures were settled by combining some of the proposed reactants. The treatments performed on the pristine SH powder are the following:…”

Section: Methodsmentioning

confidence: 99%

Graphene platelets from shungite rock modulate electropolymerization and charge storage mechanisms of soft-template synthetized polypyrrole-based nanocomposites

Politi

Carcione

Tamburri

et al. 2018

Sci Rep

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We report here on soft-template electropolymerizations of polypyrrole (Ppy)-based nanocomposites triggered by graphene platelets (GP) from shungite (SH) rocks. A properly designed procedure for an efficient extraction of graphene platelets from SH powders is established to produce remarkable graphene materials in a low oxidation state and with a high electrical conductivity (1490 S cm−1). By using positively and negatively charged templating surfactants the role played by the graphene units on the electropolymerization reactions is pointed out by SEM, EDX, TEM, SAED, XPS and Raman spectroscopy. The morphological/structural characterizations highlight that GP from SH have a surface chemistry suitable for selective and mutual interactions with the growing Ppy chains. CV and galvanostatic charge/discharge measurements evidence that GP improve the transport of both electrons and ions within the bulk material by means of a synergistic action with the polymer phase. This cooperative behavior induces an enhancement of the specific capacitance up to 250 F g−1 at 2 A g−1. The Ppy-GP materials produced following the settled protocols result to be appropriate for fabricating multifunctional charge transport and storage electroactive systems.

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Section: Methodsmentioning

confidence: 99%

Graphene platelets from shungite rock modulate electropolymerization and charge storage mechanisms of soft-template synthetized polypyrrole-based nanocomposites

Politi

Carcione

Tamburri

et al. 2018

Sci Rep

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show abstract

“…A systematic study allowed us to define a protocol for SH processing able to eliminate foreign species and amorphous carbon, limiting at the same time the oxidation degree of the final material. This goal was achieved by adopting the below described procedure, that was settled taking into consideration previously reported strategies to eliminate silicates, to remove metals, oxides, and amorphous carbon …”

Section: Methodsmentioning

confidence: 99%

“…This goal was achieved by adopting the below described procedure, that was settled taking into consideration previously reported strategies to eliminate silicates, 45 to remove metals, oxides, and amorphous carbon. 46 The as-received SH powder, that henceforth will be named as sample S, was dissolved and kept under power ultrasound for 12 h in an aqueous solution of 20 M HF and 15 M HNO 3 in a 1:1 volume ratio. After that, the powder was recovered and dispersed in a 12 M HCl aqueous solution for an overnight treatment under magnetic stirring in a thermostatically controlled water bath.…”

Section: Introductionmentioning

confidence: 99%

Shungite Carbon as Unexpected Natural Source of Few-Layer Graphene Platelets in a Low Oxidation State

Tamburri¹,

Carcione²,

Politi³

et al. 2018

Inorg. Chem.

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The paper reports on the feasibility of obtaining graphene nanomaterials with remarkable structural and chemical features from shungite rocks. The investigation of the composition and structural modifications induced in the pristine, natural C-containing mineraloid by a specifically designed physicochemical purification treatment is performed by a combined use of several techniques (scanning electron microscopy, high resolution transmission electron microscopy, X-ray diffraction, Raman and X-ray photoelectron spectroscopies). The adopted material processing enables efficient extraction of the C phase in the form of thin polycrystalline platelets of a few hundred nanometers sizes, and formed by 6-10 graphene sheets. About 80% of such nanostructures are characterized by a regular sp C honeycomb lattice and an ordered stacking of graphene layers with a d-spacing of ∼0.34 nm. The low oxygen content (∼5%), mainly found in the form of hydroxyl functional groups, provides the graphene platelets (GP) with a chemistry strictly close to that of conventional rGO materials. Such a feature is supported by the high conductivity value of 1.041 × 10 S cm found for pelletized GP, which can be considered a valuable active material for a wide spectrum of advanced applications.

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Application of carbon nanostructures in biomedicine: realities, difficulties, prospects

Semenov,

Ageev,

Kukaliia

et al. 2024

Nanotoxicology

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Activation of the carbon component of shungite-III and the sorption capacity of the material for hydrogen

Cited by 5 publications

References 6 publications

Graphene platelets from shungite rock modulate electropolymerization and charge storage mechanisms of soft-template synthetized polypyrrole-based nanocomposites

Graphene platelets from shungite rock modulate electropolymerization and charge storage mechanisms of soft-template synthetized polypyrrole-based nanocomposites

Shungite Carbon as Unexpected Natural Source of Few-Layer Graphene Platelets in a Low Oxidation State

Application of carbon nanostructures in biomedicine: realities, difficulties, prospects

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