One-step growth of multilayer-graphene hollow nanospheres via the self-elimination of SiC nuclei templates

Kim, Byeong Geun; Nam, Deok-Hui; Jeong, Seong‐Min; Lee, Myung‐Hyun; Seo, Won‐Seon; Choi, Soon‐Mok

doi:10.1038/s41598-017-13143-3

Cited by 7 publications

(5 citation statements)

References 55 publications

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“…After they rearrange and crystallize at a relatively low temperature, a few epitaxial graphene layer form on the surface of SiC nanopowder (SiC/G, step III in Figure a). In addition, the thermal decomposition of SiC may have contributed to the formation of graphene layers on the SiC nanoparticles because the processing temperature was sufficiently high (above 1000 °C). , Specifically, after Si(s) atoms vaporize, residual C(s) atoms may be used as carbon sources for graphene layers, in addition to carbon from external sources. Finally, Pt nanoparticles are deposited on the surface of the SiC/G during the hydrothermal method (step IV in Figure a).…”

Section: Resultsmentioning

confidence: 99%

Highly Durable Platinum Catalysts on Nano-SiC Supports with an Epitaxial Graphene Nanosheet Layer Grown from Coffee Grounds for Proton Exchange Membrane Fuel Cells

Kim

Lee

Jung

et al. 2023

ACS Appl. Energy Mater.

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Robust ceramic supports have attracted significant attention as alternatives to carbon supports for proton exchange membrane fuel cells (PEMFCs). However, they suffer from lower electrocatalytic activities than carbon-based supports because of their electrical conductivity. Here, SiC nanopowders were modified with epitaxial graphene and evaluated as the support for Pt in PEMFCs. Coffee grounds are used as a carbon source to not only enhance the electrocatalytic activity of the graphene-modified SiC supports but also demonstrate the feasibility of exploiting and commercializing this widely available waste product. The Pt-decorated ceramic supports deliver the enhanced durability and performance under the accelerated electro′chemical conditions.

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Section: Resultsmentioning

confidence: 99%

Highly Durable Platinum Catalysts on Nano-SiC Supports with an Epitaxial Graphene Nanosheet Layer Grown from Coffee Grounds for Proton Exchange Membrane Fuel Cells

Kim

Lee

Jung

et al. 2023

ACS Appl. Energy Mater.

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“…Hollow carbon nanospheres have been previously shown to be used as sensors and for electrochemical energy storage . Hollow graphene-like carbon nanospheres can be synthesized from the decomposition of tetramethylsilane templates via a SiC intermediate at 2100 °C . Chlorine gas extraction of metal from a metal carbide is another method used to synthesize hollow carbon nanospheres .…”

Section: Results and Discussionmentioning

confidence: 99%

“…82 Hollow graphene-like carbon nanospheres can be synthesized from the decomposition of tetramethylsilane templates via a SiC intermediate at 2100 °C. 83 Chlorine gas extraction of metal from a metal carbide is another method used to synthesize hollow carbon nanospheres. 84 Chlorine-assisted methods often result in some residual chlorine after the metal chloride extraction.…”

Section: Ca(oh)mentioning

confidence: 99%

Graphene-like Carbon from Calcium Hydroxide

et al. 2021

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The development of inexpensive and environmentally friendly graphene-like carbon is critical for its integration into industrial products. This work highlights the production of graphene-like carbon structures from calcium hydroxide. The chemical vapor deposition conditions to grow graphitic carbon on a calcium hydroxide catalyst are reported. Acetylene, steam, and calcium hydroxide are used to grow a crumpled carbon morphology. The crumpled carbon resulted in a high surface area of 1276 m 2 /g and high electrical conductivity (>10 5 S/m). Additionally, the significance and origin of the C 1s X-ray photoelectron spectroscopy (XPS) π−π* plasmon loss peak as it is related to high electrical conductivity is reported. A unique mechanism for the catalytic process involving calcium acetylide is proposed. Several deposition times, steam concentration, and catalyst morphology were tested to synthesize a variety of carbon morphologies from calcium-based materials. Crumpled carbon, hollow nanospheres, bamboo-like carbon nanotubes, multi-walled carbon nanotubes, and graphene fiber morphologies were all formed using calcium-based catalysts. Multiple reaction conditions, a scaled reaction (300 g), and catalyst recyclability were investigated. Calcium-based materials were then used as catalysts for the growth of other graphene-like carbons.

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“…3DGNs prepared by this means possess ultra−high specific surface area and porosity, but the robustness still could not meet the need of the electrodes for high performance lithium–sulfur batteries. A one−step growth method is proposed to prepare multilayer−graphene hollow nanospheres by preparing SiC@C core/shell nanoparticles and evaporating the SiC core under high temperature [ 29 ]. Though pre−fabricated templates is not required for this method, the lack of internal nano−architectures structure of these hollow nanospheres limits their applications.…”

Section: Introductionmentioning

confidence: 99%

Mass Production of 3D Connective Graphene Networks by Fluidized Bed Chemical Vapor Deposition and Its Application in High Performance Lithium-Sulfur Battery

et al. 2021

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Three−dimensional (3D) graphene with novel nano−architectures exhibits many excellent properties and is promising for energy storage and conversion applications. Herein, a new strategy based on the fluidized bed chemical vapor deposition (FB−CVD) process was proposed to prepare 3D graphene networks (3DGNs) with various nano−architectures. Specially designed SiC−C@graphene core/shell nanoparticles were prepared taking the advantages of the FB−CVD system, and 3DGNs with hierarchical nanostructures were obtained after removing the SiC core. The 3DGNs performed well as electrodes of lithium–sulfur batteries. The C–S cathode showed good rate performance at the current density of 0.1–2.0 C, and an initial discharge capacity of 790 mAhg−1 cathode was achieved at a current density of 0.2 C. The Li−S batteries showed stabilized coulombic efficiency as high as 94% and excellent cyclic performance with an ultra low cyclic fading rate of 0.075% for the initial 280 cycles at a current density of 1.0 C. The improved electrochemical performance was ascribed to the enhanced conductivity by the connective graphene networks and the weakened shuttle effect by the special outer graphene layers. Mass production of the products was realized by the continuous FB−CVD process, which opens up new perspectives for large scale application of 3D graphene materials.

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One-step growth of multilayer-graphene hollow nanospheres via the self-elimination of SiC nuclei templates

Cited by 7 publications

References 55 publications

Highly Durable Platinum Catalysts on Nano-SiC Supports with an Epitaxial Graphene Nanosheet Layer Grown from Coffee Grounds for Proton Exchange Membrane Fuel Cells

Highly Durable Platinum Catalysts on Nano-SiC Supports with an Epitaxial Graphene Nanosheet Layer Grown from Coffee Grounds for Proton Exchange Membrane Fuel Cells

Graphene-like Carbon from Calcium Hydroxide

Mass Production of 3D Connective Graphene Networks by Fluidized Bed Chemical Vapor Deposition and Its Application in High Performance Lithium-Sulfur Battery

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