Effect of crystallinity of PAN-based carbon fiber surfaces on the formation characteristics of silicon carbide coating

He, Haoyuan; Yang, Fenghao; Ge, Yicheng; Ran, Liping; Peng, Ke; Yi, Maozhong

doi:10.1088/2053-1591/ab198c

Cited by 17 publications

(6 citation statements)

References 12 publications

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“…Moreover, the lower peak at 2θ = 45°, corresponding to the (100) plane of the graphite layers, appears in the XRD pattern of CF. According to previous studies, the prepared CF can be assigned to amorphous carbon structure 27,28 . The XRD pattern of nano‐coral W 2 C shows various sharp peaks.…”

Section: Resultsmentioning

confidence: 83%

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Synthesis of nano‐coral tungsten carbide/carbon fibers as efficient catalysts for hydrogen evolution reaction

Nguyen

et al. 2022

Intl J of Energy Research

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Tungsten-carbides (W x C) are cermet materials that exhibit different unique characteristics, such as supper strength, good thermal conductivity, and electrical conductivity as well as good catalytic activity. In this study, we report a facile and scalable process using the electrospinning technique to grow a unique structure which is nano-coral tungsten carbine (W 2 C) on carbon fibers. The crystallinity, structure, morphology, and chemical bonding of W 2 C are characterized by using different techniques, including X-ray diffraction (XRD), Raman spectra, field-emission scanning microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM).The results confirm that the nano-coral structure of W 2 C is successfully prepared. Specifically, the diameter and length of nano-coral W 2 C are about 70 $ 100 nm and 1 $ 2 μm, respectively. Nano-coral W 2 C could be employed for electrocatalytic application including hydrogen evolution reaction (HER). Notably, nano-coral W 2 C shows the efficiency of electrocatalytic activity toward HER, with low Tafel slope of 79 mV.dec À1 , high double-layer capacitance of 3.2 mF.cm À2 , and exceptional stability under working conditions for 1000 cycles test. Therefore, this study presents an approach for the preparation of nano-coral W 2 C and demonstrates their potential as scalable and stable catalysts for the HER. K E Y W O R D S electrospinning, hydrogen evolution reaction, nano-coral W 2 C, tungsten carbide Tuan Van Nguyen and Quyet Van Le contributed equally to this work.

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Section: Resultsmentioning

confidence: 83%

“…According to previous studies, the prepared CF can be assigned to amorphous carbon structure. 27,28 The XRD pattern of nano-coral W 2 C shows various sharp peaks. The highest peak located at 2θ = 25.9 can be ascribed to the (002) plane of graphite.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of nano‐coral tungsten carbide/carbon fibers as efficient catalysts for hydrogen evolution reaction

Nguyen

et al. 2022

Intl J of Energy Research

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“…The GIXRD patterns of the as-prepared films of the uncoated Toray paper and of the pristine TiN powder are shown in Figure S5. Pure Toray paper shows only one strong peak at 2θ = 30.7°c orresponding to the peak of pure graphite, 73,74 while both TiN/ NF@Toray-pristine and Toray-irr show strong signal belonging to the Toray paper and the characteristic diffraction peaks of TiN. 75,76 The Raman spectrum (Figure 1e) of TiN/NF@Toray-irr shows two broad peaks centered at 1350 and 1585 cm −1 , which can be attributed to the D and G bands, respectively, both bands being absent in TiN/NF@Toray-pristine.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Thermoplasmonic In Situ Fabrication of Nanohybrid Electrocatalysts over Gas Diffusion Electrodes for Enhanced H₂O₂ Electrosynthesis

et al. 2023

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Large-scale development of electrochemical cells is currently hindered by the lack of Earth-abundant electrocatalysts with high catalytic activity, product selectivity, and interfacial mass transfer. Herein, we developed an electrocatalyst fabrication approach which responds to these requirements by irradiating plasmonic titanium nitride (TiN) nanocubes self-assembled on a carbon gas diffusion layer in the presence of polymeric binders. The localized heating produced upon illumination creates unique conditions for the formation of TiN/F-doped carbon hybrids that show up to nearly 20 times the activity of the pristine electrodes. In alkaline conditions, they exhibit enhanced stability, a maximum H 2 O 2 selectivity of 90%, and achieve a H 2 O 2 productivity of 207 mmol g TiN −1 h −1 at 0.2 V vs RHE. A detailed electrochemical investigation with different electrode arrangements demonstrated the key role of nanocomposite formation to achieve high currents. In particular, an increased TiO x N y surface content promoted a higher H 2 O 2 selectivity, and fluorinated nanocarbons imparted good stability to the electrodes due to their superhydrophobic properties.

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“…Previous studies reported that PAN‐based carbon fiber reacted with molten silicon to form β ‐SiC at 1500 °C, and SiC crystals were precipitated from the carbon solution in liquid silicon during high temperatures, rather than after cooling. [ 38 ] Figure 9b shows that the diffraction peak intensity of SiC increased with the increase of CCF content due to the increase of the β ‐SiC phase formed by the silicon carbon reaction. At the same time, an increase in the diffraction peak intensity of amorphous carbon was also observed, which was due to the incomplete reaction of silicon and carbon.…”

Section: Resultsmentioning

confidence: 99%

Effects of Chopped Carbon Fiber on the Forming, Structure, and Mechanical Properties of CCF/SiC Composites Fabricated by Selective Laser Sintering and Reactive Melt Infiltration

et al. 2023

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Silicon carbide (SiC) composites are fabricated by selective laser sintering (SLS) combined with reactive melt infiltration (RMI) using SiC powder mixed with various contents (0–32 vol%) of chopped carbon fiber (CCF) as reinforcement phase and carbon source. The introduction of an appropriate amount of CCF can reduce the shrinkage and step effect caused by slicing, improving the forming quality of the CCF/SiC preforms after pyrolysis. Meanwhile, as a carbon resource, CCF can react with molten silicon to form the β‐SiC, improving the mechanical properties of CCF/SiC composites. The result shows that the CCF/SiC powder shows excellent fluidity, and the angle of repose of the CCF/SiC powder is 32–40° when the proportion of CCF is less than 24 vol%. CCF/SiC preforms shrinkage is lower than 1.74% and 1.94% along the nonadditive and additive manufacturing directions, respectively. Compared without CCF, the bending strength and fracture toughness of the CCF/SiC composites with 8 vol% CCF improve from 137.9 MPa and 2.69 MPa m1/2 to 177.1 MPa and 3.10 MPa m1/2, respectively. This study is believed to provide a new strategy for additive manufacturing of high‐performance CCF/SiC composites with high CCF content by SLS.

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Effect of crystallinity of PAN-based carbon fiber surfaces on the formation characteristics of silicon carbide coating

Cited by 17 publications

References 12 publications

Synthesis of nano‐coral tungsten carbide/carbon fibers as efficient catalysts for hydrogen evolution reaction

Synthesis of nano‐coral tungsten carbide/carbon fibers as efficient catalysts for hydrogen evolution reaction

Thermoplasmonic In Situ Fabrication of Nanohybrid Electrocatalysts over Gas Diffusion Electrodes for Enhanced H₂O₂ Electrosynthesis

Effects of Chopped Carbon Fiber on the Forming, Structure, and Mechanical Properties of CCF/SiC Composites Fabricated by Selective Laser Sintering and Reactive Melt Infiltration

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Effect of crystallinity of PAN-based carbon fiber surfaces on the formation characteristics of silicon carbide coating

Cited by 17 publications

References 12 publications

Synthesis of nano‐coral tungsten carbide/carbon fibers as efficient catalysts for hydrogen evolution reaction

Synthesis of nano‐coral tungsten carbide/carbon fibers as efficient catalysts for hydrogen evolution reaction

Thermoplasmonic In Situ Fabrication of Nanohybrid Electrocatalysts over Gas Diffusion Electrodes for Enhanced H2O2 Electrosynthesis

Effects of Chopped Carbon Fiber on the Forming, Structure, and Mechanical Properties of CCF/SiC Composites Fabricated by Selective Laser Sintering and Reactive Melt Infiltration

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Thermoplasmonic In Situ Fabrication of Nanohybrid Electrocatalysts over Gas Diffusion Electrodes for Enhanced H₂O₂ Electrosynthesis