Few-layer graphene-like flakes derived by plasma treatment: A potential material for hydrogen adsorption and storage

Kostoglou, Nikolaos; Tarat, Afshin; Walters, Ian; Рыжков, В. А.; Tampaxis, Christos; Charalambopoulou, Georgia; Steriotis, Theodore; Mitterer, Christian; Rebholz, Claus

doi:10.1016/j.micromeso.2016.01.027

Cited by 42 publications

(18 citation statements)

References 18 publications

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“…These included: (a) graphene nanoplatelets (GNP) with <5 µm diameter, <50 nm thickness, 2 wt.% -COOH content and 96% purity and (b) few-layer graphene flakes (FLG) with stacks of 3-6 layers, <2 µm diameter, <3 nm thickness, 2 wt.% -COOH content and 96% purity. Both materials were produced by exposing natural flake graphite in argon plasma for two different time periods using a custom-made multi-electrode dielectric barrier discharge plasma reactor, as described elsewhere [4,32]. Figure 1 (upper left) allows to visualize the difference in the volume occupied from 2 g of each graphene powder.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

“…The N 2 adsorption/desorption isotherms recorded at 77 K for the degassed FLG and GNP powders are shown in Figure 2f. The much higher N 2 uptake of the FLG at low relative pressures (P/P 0 < 0.01) is attributed to its microporosity (i.e., pore widths < 2 nm) [4]. In addition, the formation of a small hysteresis loop between the adsorption and desorption curves for the FLG is related to capillary condensation of N 2 gas within mesopores (i.e., pore sizes of 2-50 nm) [44].…”

Section: Dispersion and Wettability Studiesmentioning

confidence: 96%

“…Exfoliated graphene, a two-dimensional single-layer of sp 2 -bonded carbon atoms distributed in hexagonal cells, has been the subject of considerable research since the beginning of the 21st century due to its unique electronic, thermal, optical and mechanical properties [1,2]. Few-layer graphene (FLG), composed of a limited number of stacked graphene layers, can be also produced in a porous form [3], thus providing high specific surface areas and pore volumes combined with tunable pore sizes [4]. Apart from these surface-related features, porous graphene-based materials possess other significant advantages such as low densities, reasonably good thermochemical stability, excellent recyclability, environmental friendliness and non-toxicity [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Plasma-Derived Graphene-Based Materials for Water Purification and Energy Storage

Natter

Kostoglou

Koczwara

et al. 2019

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Several crucial problems, such as rapid population growth and extended demands for food, water and fuels, could lead to a severe lack of clean water and an energy crisis in the coming decade. Therefore, low-cost and highly-efficient technologies related to filtration of alternative water supplies (e.g., purification of wastewater and water-rich liquids) and advanced energy storage (e.g., supercapacitors) could play a crucial role to overcome such challenges. A promising class of solid materials for these purposes is exfoliated graphene, and more specifically, its nanoporous forms that exhibit large specific surface areas and pore volumes. In the current work, two plasma-exfoliated graphene-based materials with distinctive morphological and porosity features, including non-porous and low-specific surface area platelets versus nanoporous and high-specific surface area flakes, were tested as filters for water purification purposes (i.e., decolourization and deacidification) and as electrodes for supercapacitors (i.e., ion electrosorption). The findings of this study suggest that a nanoporous and large specific surface area graphene-based material promotes the water purification behaviour by removing contaminants from water-based solutions as well as the energy storage performance by confining ions of aqueous electrolytes.

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Section: Materials and Experimental Methodsmentioning

confidence: 99%

Section: Dispersion and Wettability Studiesmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Plasma-Derived Graphene-Based Materials for Water Purification and Energy Storage

Natter

Kostoglou

Koczwara

et al. 2019

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“…To the aim of combining a modest computational effort with realism of the final model, a good strategy is using as precursors already formed graphene portions [77,78] instead of atoms. On this road, a step forward was recently done using a model building algorithm that mimics the real synthesis [55,79]. The starting point is a mixture of flakes with size and shape distributed according to the experimentally known composition of the suspension.…”

Section: Graphene-based Nano-porous Materials: Production and Computementioning

confidence: 99%

Engineering 3D Graphene-Based Materials: State of the Art and Perspectives

Bellucci

Tozzini

2020

Molecules

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Graphene is the prototype of two-dimensional (2D) materials, whose main feature is the extremely large surface-to-mass ratio. This property is interesting for a series of applications that involve interactions between particles and surfaces, such as, for instance, gas, fluid or charge storage, catalysis, and filtering. However, for most of these, a volumetric extension is needed, while preserving the large exposed surface. This proved to be rather a hard task, especially when specific structural features are also required (e.g., porosity or density given). Here we review the recent experimental realizations and theoretical/simulation studies of 3D materials based on graphene. Two main synthesis routes area available, both of which currently use (reduced) graphene oxide flakes as precursors. The first involves mixing and interlacing the flakes through various treatments (suspension, dehydration, reduction, activation, and others), leading to disordered nanoporous materials whose structure can be characterized a posteriori, but is difficult to control. With the aim of achieving a better control, a second path involves the functionalization of the flakes with pillars molecules, bringing a new class of materials with structure partially controlled by the size, shape, and chemical-physical properties of the pillars. We finally outline the first steps on a possible third road, which involves the construction of pillared multi-layers using epitaxial regularly nano-patterned graphene as precursor. While presenting a number of further difficulties, in principle this strategy would allow a complete control on the structural characteristics of the final 3D architecture.

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“…When produced with the help of biotechnologies, carbon-based materials have a potential to not only achieve zero, but even negative-CO 2 emission-via binding CO 2 from the atmosphere in the process of photosynthesis. Different carbon-based structures are being considered in experiments, e.g., nanoporous spongy graphene [6], few-layer graphene flakes [7], or even nanoscaled activated carbon cloth [8], to mention a few. Also theoretically, a multitude of carbons are considered, among them carbon nanotubes [9,10], pillared graphene [11], sandwiched graphene-fullerene composite [12], or nanohorns and nanocones [13].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of H2 on Penta-Octa-Penta Graphene: Grand Canonical Monte Carlo Study

Popov

Dengg

Gehringer

et al. 2020

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In this paper, we report the results of hydrogen adsorption properties of a new 2D carbon-based material, consisting of pentagons and octagons (Penta-Octa-Penta-graphene or POP-graphene), based on the Grand-Canonical Monte Carlo simulations. The new material exhibits a moderately higher gravimetric uptake at cryogenic temperatures (77 K), as compared to the regular graphene. We discuss the origin of the enhanced uptake of POP-graphene and offer a consistent explanation.

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Few-layer graphene-like flakes derived by plasma treatment: A potential material for hydrogen adsorption and storage

Cited by 42 publications

References 18 publications

Plasma-Derived Graphene-Based Materials for Water Purification and Energy Storage

Plasma-Derived Graphene-Based Materials for Water Purification and Energy Storage

Engineering 3D Graphene-Based Materials: State of the Art and Perspectives

Adsorption of H2 on Penta-Octa-Penta Graphene: Grand Canonical Monte Carlo Study

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