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Effects of Ultra-high Temperature Treatment on the Microstructure of carbon fibers

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Chinese Journal of Polymer Science 2017年第6期35卷 764-772页

作者： Wei-wei Li Hong-liang Kang 徐坚刘瑞刚 Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular Science Institute of Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences

The microcrystalline structure and microvoid structure in carbon fibers during graphitization process （2300-2700 ℃） were characterized employing laser micro-Raman scattering （Raman）, X-ray diffraction （XRD）, small angle X-ray scattering （SAXS）, and high-resolution transmission electron microscopy （HR-TEM）. The crystalline sizes （La, Lc） increased and interlayer spacing （d002） decreased with increasing heat treatment temperature （HTT）. The microvoids in the fibers grew up and contacted to the neighbors with the development of microcrystalline. In addition, the preferred orientation of graphite crystallite along fiber axis decreased and microvoids increased. The results are crucial for analyzing the evolution of microstructure of carbon fibers in the process of heat treatment and important for the preparation of high strength and high modulus carbon fibers.

关键词： carbon fibers Graphitization Microcrystalline structure Microvoid structure

One-pot synthesis of Sb-Fe-carbon-fiber composites with in situ catalytic growth of carbon fibers

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International Journal of Minerals,Metallurgy and Materials 2012年第6期19卷 542-548页

作者： Jiart Xie Wen-tao Song Gao-shao Cao Xin-bing Zhao Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

A Sb-Fe-carbon-fiber （CF） composite was prepared by a chemical vapor deposition （CVD） method with in situ growth of CFs us- ing Sb203/Fe2O3 as the precursor and acetylene （C2H2） as the carbon source. The Sb-Fe-CF composite was characterized by X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM） and transmission electron microscopy （TEM）, and its electrochemical per- formance was investigated by galvanostatic charge-discharge cycling and electrochemical impedance spectroscopy. The Sb-Fe-CF composite shows a better cycling stability than the Sb-amorphous-carbon composite prepared by the same CVD method but using Sb2O3 as the precur- sor. Improvements in cycling stability of the Sb-Fe-CF composite can be attributed to the formation of three-dimensional network structure by CFs, which can connect Sb particles firmly. In addition, the CF layer can buffer the volume change effectively.

关键词： composite materials antimony alloys carbon fibers chemical vapor deposition catalytic growth network structures lithiumbatteries anodes

Hyphae-mediated bioassembly of carbon fibers derivatives for advanced battery energy storage

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carbon Energy 2024年第6期6卷 140-150页

作者： Lei Huang Zhong Qiu Ping Liu Xinhui Xia Feng Cao Xinping He Chen Wang Wangjun Wan Yongqi Zhang Yang Xia Wenkui Zhang Minghua Chen Jiancang Zhou Department of Critical Care Medicine Sir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhouChina State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang ProvinceSchool of Materials Science&EngineeringZhejiang UniversityHangzhouChina College of Materials Science&Engineering Zhejiang University of TechnologyHangzhouChina State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhouChina Department of Engineering Technology Huzhou CollegeHuzhouChina Zhejiang Academy of Science and Technology for Inspection&Quarantine HangzhouZhejiangChina Institute of Fundamental and Frontier Science University of Electronic Science and Technology of ChinaChengduChina Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbinChina

Ingenious design and fabrication of advanced carbon-based sulfur cathodes are extremely important to the development of high-energy lithium-sulfur batteries,which hold promise as the next-generation power ***,for the first time,we report a novel versatile hyphae-mediated biological assembly technology to achieve scale production of hyphae carbon fibers(HCFs)derivatives,in which different components including carbon,metal compounds,and semiconductors can be homogeneously assembled with HCFs to form composite *** mechanism of biological adsorption assembly is also *** a representative,reduced graphene oxides(rGOs)decorated with hollow carbon spheres(HCSs)successfully co-assemble with HCFs to form HCSs@rGOs/HCFs hosts for sulfur *** this unique architecture,not only large accommodation space for sulfur but also restrained volume expansion and fast charge transport paths are ***,multiscale physical barriers plus chemisorption sites are simultaneously established to anchor soluble lithium ***,the designed HCSs@rGOs/HCFs-S cathodes deliver a high capacity(1189 mA h g^(-1)at 0.1 C)and good high-rate capability(686 mA h g^(-1)at 5 C).Our work provides a new approach for the preparation of high-performance carbon-based electrodes for energy storage devices.

关键词： bioassembly carbon fibers energy storage graphene lithium-sulfur batteries

Performance of Polyaniline-coated Short carbon fibers in Electromagnetic Shielding Coating

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Journal of Materials Science & Technology 2007年第4期23卷 529-534页

作者： Dongxiu YU Jiang CHENG Zhuoru YANG School of Chemical and Energy Engineering South China University of Technology Guangzhou 510640 China

Combined nitric acid oxidation method and polyaniline （PANI）-coated method were applied to modify the surface properties of short carbon fibers （SCF）. The electrical and mechanical properties of acrylic coatings with 50 wt pct PANI-coated carbon fiber were investigated by using scanning electron microscope （SEM）, UV-Vis spectrophotometer, four-probe method and the coaxial cable method. The results of the pH measurement and XPS （X-ray photoelectron spectroscopy） patterns showed that the oxygen functional groups, such as -OH and -COOH, were attached on the carbon fiber surfaces after oxidation treatment. The XPS analysis of PANl-coated oxidized SCF （PAOSCF） revealed that PANI may bond on the surface of oxidized SCF with chemical bonds. SEM images and surface roughness analyses showed that PANl-coated layer changed the surface morphology. Compared with SCF/acrylic coating, the surface resistivity of PAOSCF/acrylic coating decreased from17.1 to 5.3 Ω/sq and the shielding efficiency （SE） value increased from 1.54 to 23.3 dB.

关键词： carbon fibers Polyaniline Surface treatment Dispersion stability Shielding effectiveness

Effect of Growth Temperature on carbon Nanotube Grafting Morphology and Mechanical Behavior of carbon fibers and carbon] carbon Composites

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Journal of Materials Science & Technology 2017年第1期33卷 65-70页

作者： Lei Feng Ke-Zhi Li Jin-Hua Lu Le-Hua Qi State Key Laboratory of Solidification Processing Carbon/Carbon Composites Research Center Northwestern Polytechnical University Xi'an 710072 China School of Mechatronic Engineering Northwestern Polytechnical University Xi'an 710072 China

High-purity carbon nanotubes （CNTs） with different orientation and lengths were grafted on carbon fibers （CFs） in woven fabrics by using double injection chemical vapor deposition and adjusting the growth temperature. Scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and Raman investigations reveal that the grafted CNTs change from being predominantly aligned and uniform in di- ameter to absolutely disordered and variable in diameter, whilst they show significantly increased crystallinity, as the growth temperature is increased from 730 ~C to 870 ~C. In tensile tests of fiber bundles, much more strength degradation of CFs was observed after the growth process at higher temperature than that at lower temperature. These hybrid preforms produced at different growth temperatures were used to reinforce carbon/carbon （C/C） composites. An increment of 34.4% in out-of-plane compressive strength （OCS） was obtained for the composites containing CNTs grown at 730℃, while the OCS increment exhibits an obvious decrease with increasing the growth temperature. Compared with the higher growth temperature, the lower temperature contributes to the decrease in the strength loss of reinforcing fibers and meanwhile the growth of large extending length of CNTs, which can provide long reinforcement to the pyrocarbon matrix, and thus increase the compressive strength better.

关键词： carbon nanotubes carbon fibers Chemical vapor deposition carbon/carbon composites Mechanical strength

DSC Study on the Polyacrylonitrile Precursors for carbon fibers

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Journal of Materials Science & Technology 2005年第4期21卷 581-584页

作者： Wangxi ZHANG Musen LI Department of Materials and Chemical Engineering Zhongyuan Institute of Technology Zhengzhou 450007 China School of Materials Science and Engineering Shandong University Jinan 250061 China

Different polyacrylonitrile （PAN） precursor fibers that displayed various thermal properties were studied by using differential scanning calorimetry （DSC）. Results showed that some commercial PAN precursor fibers displayed double separated peaks and these fibers were of high quality because of their process stability during their conversion to carbon fibers of high performance. Some fabrication processes, such as spinning, drawing, could not apparently change the DSC features of a PAN precursor fiber. It was concluded that the thermal properties of a PAN precursor fiber was mainly determined from its comonomer content type and compositions.

关键词： Polyacrylonitrile precursor fibers Differential scanning calorimetry (DSC) Thermal properties carbon fibers

Full‑Color Tunable and Highly Fire‑Retardant Colored carbon fibers

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Advanced Fiber Materials 2023年第5期5卷 1618-1631页

作者： Yuxin Luo Yu Zhang Tonghe Xing Annan He Shichao Zhao Zhiyu Huang Zihui Liang Xin Liu Yequn Liu Yuxiu Yu Yong Qin Fengxiang Chen Weilin Xu State Key Laboratory of New Textile Materials and Advanced Processing Technologies and Hubei Key Laboratory of Digital Textile Equipment Wuhan Textile UniversityWuhan 430200People’s Republic of China State Key Laboratory of Coal Conversion CAS Key Laboratory of Carbon Materials and Analytical Instrumentation CenterInstitute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001People’s Republic of China State Key Laboratory of Bio‑fibers and Eco‑Textiles Institute of Functional Textiles and Advanced MaterialsCollege of Textiles and ClothingQingdao UniversityQingdao 266071People’s Republic of China National Joint Laboratory for Advanced Textile Processing and Clean Production Wuhan Textile UniversityWuhan 430200People’s Republic of China

carbon fibers(CFs)are widely used in various cutting-edge fields,such as aerospace,military,automobiles,and sports,owing to their unique combination of excellent mechanical properties,good thermal stability,and ***,their inherent super-black appearance makes it difficult to satisfy the aesthetic/fashion requirements of the colorful world,and the flammability of CFs severely limits their practical utilization in high-temperature and other extreme ***,we fabricated full-color tunable colored CFs on a large-scale via atomic layer deposition,based on the monolayer film interference *** exhibited brilliant colors and excellent environmental durability in extreme environments,such as intense ultraviolet(UV)irradiation,accelerated laundering,friction,high-temperature,and low-temperature *** CFs also exhibited excellent fire-retardant performance that could withstand alcohol-lamp flame burning for 60 *** work provides insights into an innovative material/structural design that can help achieve rapid development of the CF industry and global carbon neutrality/sustainability.

关键词： carbon fibers carbon fiber fabrics Full-colors Environmental durability Fire-retardant

A host-guest approach to fabricate metallic cobalt nanoparticles embedded in silk-derived N-doped carbon fibers for efficient hydrogen evolution

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Green Energy & Environment 2017年第2期2卷 151-159页

作者： Fenglei Lyu Qingfa Wang Han Zhu Mingliang Du Li Wang Xiangwen Zhang Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and Technology Tianjin University Department of Materials Engineering College of Materials and Textiles Zhejiang Sci-Tech University

Hydrogen evolution reaction(HER) plays a key role in generating clean and renewable energy. As the most effective HER electrocatalysts, Pt group catalysts suffer from severe problems such as high price and scarcity. It is highly desirable to design and synthesize sustainable HER electrocatalysts to replace the Pt group catalysts. Due to their low cost, high abundance and high activities, cobalt-incorporated N-doped nanocarbon hybrids are promising candidate electrocatalysts for HER. In this report, we demonstrated a robust and eco-friendly host-guest approach to fabricate metallic cobalt nanoparticles embedded in N-doped carbon fibers derived from natural silk fibers. Benefiting from the onedimensional nanostructure, the well-dispersed metallic cobalt nanoparticles and the N-doped thin graphitized carbon layer coating, the best Cobased electrocatalyst manifests low overpotential(61 mV@10 mA/cm^2) HER activity that is comparable with commercial 20% Pt/C, and good stability in acid. Our findings provide a novel and unique route to explore high-performance noble-metal-free HER electrocatalysts.

关键词： Silk carbon fibers Cobalt nanoparticles Hydrogen evolution Nitrogen doping

Comparative Study on Preparing carbon fibers Based on PAN Precursors with Different Comonomers

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Journal of Wuhan University of Technology(Materials Science) 2006年第1期21卷 26-28页

作者：张旺玺 Department of carbon fibers and Composites Beijing University of Chemical TechnologyBeijing 100029China

Two different PAN precursors with various comonomers were wet-spun. The properties and structurul changes of PAN precursors and their evolution during preoxidation and carbonization process were characterized by the use of DSC , FTIR and traditional parameters, e g, tensile strength. It is demonstrated that acrylamide（ AAM ） is very effective to make the DSC peak be separated compared to methyl acrylate （ MA ）. As a result, carbon fibers developed from AAM-contained precursors have a better tenacity compared to those developed from MAcontained ones.

关键词： carbon fibers polyacrylonitrile precursors structure and properties