The growth of porous carbon fibres through in situ vapour deposition

Zhou, Yi'en; Hong, Liang

doi:10.1039/c3ra43271h

Cited by 3 publications

(8 citation statements)

References 24 publications

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“…0.4cm 3 /g of sample. This concurs with our previous observation [20] that a larger surface area gained, compared to AC flake, can be attributed to the growth of needles whilst it is dense and hence, has a lower pore volume. Moreover, to understand whether the polymer precursor of AC affects dendric growth, glucose polymer and polypyrrole were in place of HEC, respectively, as the precursor for the AC flakes.…”

Section: Ppsmsid000566 3(4)2020supporting

confidence: 93%

“…To the best of our knowledge, no reports or discussions on the dendritic carbon spinal growth in N 2 -CO 2 co-gas atmosphere have been published nor observed before. Contrary to the growth of porous carbon fibers described explicitly in our previous work [20] caused…”

Section: Introductioncontrasting

confidence: 56%

“…by the random stacking of polyaromatic hydrocarbons (PAH) in the axial direction leading to the formation of fibers, this work proposes a different gowth path catalyzed by platinum atom clusters that assist with generation of CO via the reverse Boudouard reaction [21], which subsequently releases carbon atoms in vapor form that condense to form dense dendritic structures in the vortex field as illustrated in Figure 1. Although the incubation environment of this study is similar to that reported in [20], the resulting growth looks drastically different due to mediation by Pt atom clusters or colloids spread on the surface of the sample prior to the co-gas treatment. This paper aims to report and explain the growth mechanism we observed in detail.…”

Section: Ppsmsid000566 3(4)2020mentioning

confidence: 66%

“…Both samples reveal different XRD patterns. This signifies two vaporization mechanisms, namely, sublimation of PAH in N 2 to form C fibers [20] and the participation of the uncatalyzed reverse Boudouard reaction in co-gas to shape the C fibers;…”

Section: Structural Characteristics Of the Carbon Spinesmentioning

confidence: 99%

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When a cool N 2 -CO 2 co-gas stream flows over superheated activated carbon (AC) flakes, a vortex field near the interface is induced as a consequence of the confrontation of the cool co-gas stream and the hot vaporized carbon stream, where the pre-deposited Pt atom clusters on AC catalyze gasification of AC by CO 2 to produce CO, and the CO undergoes immediate disproportionation to release carbon atoms in vapor form. The vortex field functions as a dynamic template for deposition of carbon vapor, leading to the proliferation of nano-sized carbon needles with characteristic spikes (ca. 1µm) and short in length through an anisotropic assembling of carbon atoms. A trace amount of Pt pre-coated on the AC flakes is sufficient to catalyze gasifying AC by CO 2 . This phenomenon is the first observation over the surface of amorphous carbon via catalytic pyrolysis without electric potential assistance.

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Section: Ppsmsid000566 3(4)2020supporting

confidence: 93%

Section: Introductioncontrasting

confidence: 56%

Section: Ppsmsid000566 3(4)2020mentioning

confidence: 66%

Section: Structural Characteristics Of the Carbon Spinesmentioning

confidence: 99%

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2020

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“…6−8 PC owns unique properties, high surface areas, and large tunable pore channels, showing advantages in fast diffusion of molecules and the rapid electron transfer process, thus having an extensive application in electrochemical sensors and so forth. 9,10 Thus far, various synthetic methods such as chemical vapor deposition, 11 arc discharge, 12 laser ablation, 13 and chemical methods 14 have been developed to achieve high-quality carbon nanomaterials. More recently, the synthesis of high surface area carbon for electrochemical sensing applications are turned to natural biowaste materials.…”

Section: Introductionmentioning

confidence: 99%

Binder-Free Modification of a Glassy Carbon Electrode by Using Porous Carbon for Voltammetric Determination of Nitro Isomers

et al. 2019

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In this study, Liquidambar formosana tree leaves have been used as a renewable biomass precursor for preparing porous carbons (PCs). The PCs were produced by pyrolysis of natural waste of leaves after 10% KOH activation under a nitrogen atmosphere and characterized by a variety of state-of-the-art techniques. The PCs possess a large surface area, micro-/mesoporosity, and functional groups on its surface. A glassy carbon electrode modified with high PCs was explored as an efficient binder-free electrocatalyst material for the voltammetric determination of nitro isomers such as 3-nitroaniline (3-NA) and 4-nitroaniline (4-NA). Under optimal experimental conditions, the electrochemical detection of 3-NA and 4-NA was found to have a wide linear range of 0.2–115.6 and 0.5–120 μM and a low detection limit of 0.0551 and 0.0326 μM, respectively, with appreciable selectivity. This route not only enhanced the benefit from biomass wastes but also reduced the cost of producing electrode materials for electrochemical sensors. Additionally, the sensor was successfully applied in the determination of nitro isomers even in the presence of other common electroactive interference and real samples analysis (beverage and pineapple jam solutions). Therefore, the proposed method is simple, rapid, stable, sensitive, specific, reproducible, and cost-effective and can be applicable for real sample detection.

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Holey and Wrinkled Flash Graphene from Mixed Plastic Waste

et al. 2022

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High surface area varieties of graphene have captured significant attention, allowing for improved performance in a variety of applications. However, there are challenges facing the use of graphene in these applications since it is expensive and difficult to synthesize in bulk. Here, we leverage the capabilities of flash Joule heating to synthesize holey and wrinkled flash graphene (HWFG) in seconds from mixed plastic waste feedstocks, using in situ salt decomposition to produce and stabilize pore formation during the reaction. Surface areas as high as 874 m2 g–1 are obtained, with characteristics of micro-, meso-, and macroporosities. Raman spectroscopy confirms the wrinkled and turbostratic nature of the HWFG. We demonstrate HWFG applications in its use as a metal-free hydrogen evolution reaction electrocatalyst, with excellent stability, competitive overpotential, and Tafel slope; in a Li-metal battery anode allowing for stable and high discharge rates; and in a material with high gas adsorption. This represents an upcycle of mixed plastic waste, thereby affording a valuable route to address this pressing environmental pollutant concern.

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The growth of porous carbon fibres through in situ vapour deposition

Cited by 3 publications

References 24 publications

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Binder-Free Modification of a Glassy Carbon Electrode by Using Porous Carbon for Voltammetric Determination of Nitro Isomers

Holey and Wrinkled Flash Graphene from Mixed Plastic Waste

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