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Engineered NiCo-LDH nanosheets- and ZnFe_(2)O_(4) nanocubes-decorated carbon nanofiber bonded mats for high-rate asymmetric supercapacitors

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Green Energy & Environment 2022年第6期7卷 1228-1240页

作者： Jae-Gyoung Seong Tae Hoon Ko Danyun Lei Woong-Ki Choi Yun-Su Kuk Min-Kang Seo Byoung-Suhk Kim Department of Organic Materials&Fiber Engineering Jeonbuk National University567 Baekje-daeroDeokjin-guJeonju-siJeollabuk-do54896Republic of Korea Department of BIN Convergency Technology Jeonbuk National University567 Baekje-daeroDeokjin-guJeonju-siJeollabuk-do54896Republic of Korea Korea Institute of carbon Convergence Technology Jeonju54852Republic of Korea Department of Environmental Biology and Water Engineering College of Urban ConstructionWuchang Shouyi UniversityWuhan430064China

In this work,we have prepared the hierarchically nanostructured core–shell NiCo layered double hydroxide(NiCo-LDH)nanosheets-and ZnFe_(2)O_(4) nanocubes-decorated polyacrylonitrile(PAN)/pitch-based carbon nanofibers(PPCNs)webs(NiCo-LDH@PPCNs as cathode and ZnFe_(2)O_(4)@PPCNs as anode materials)with the bonded network structure by a facile and scalable hydrothemal method.Herein,the low-cost pitch with lower softening point(~90℃)as co-precursor was utilized to produce the PAN/pitch-based carbon nanofibers(PPCNs)with enhanced electrical conductivity.The obtained PPCNs with pitch content of 30%(PP30CNs)electrode material delivered higher specific capacitance(~67 F g^(-1))than that(~48 F g^(-1))of the PAN-based carbon nanofibers(PCNs)at 1 A g^(-1),due to the increased electrical conductivity and lower interfacial charge transfer resistance(RCT)of~0.16 U.Further,the NiCo-LDH-decorated PP30CNs(NiCoLDH@PP30CNs)as cathode material showed superior specific capacitance of 1162 F g^(-1) at 1.0 A g^(-1) and ultra-high retention rate of 91.56%at 10 A g^(-1).The ZnFe_(2)O_(4)@PP30CNs as anode material also showed higher specific capacitance of 282 F g^(-1) at 1 A g^(-1) and good rate capability with capacitance retention of 56.73%at 10 A g^(-1).The as-fabricated asymmetric NiCo-LDH@PP30CNs//ZnFe_(2)O_(4)@PP30CNs hybrid supercapacitor device delivered a specific capacitance of~98 F g^(-1) at 1 A g^(-1) and excellent capacitance retention of~88%after 5000 charge–discharge cycles.

关键词： carbon nanofiber Pitch Asymmetric Rate capability Supercapacitor

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Construction of 3D interconnected boron nitride/carbon nanofiber hybrid network within polymer composite for thermal conductivity improvement

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Journal of Materials Science & Technology 2023年第16期147卷 165-175页

作者： Yexiang Cui Fei Xu Di Bao Yueyang Gao Jianwen Peng Dan Lin Haolei Geng Xiaosong Shen Yanji Zhu Huaiyuan Wang School of Chemical Engineering and Technology and State Key Laboratory for Chemical Engineering Tianjin UniversityTianjin 300350China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin Key Laboratory of Chemical Process Safety and Equipment TechnologyTianjin UniversityTianjin 300350China College of Chemistry and Chemical Engineering Northeast Petroleum UniversityDaqing 163318China School of Materials Science and Engineering Tianjin UniversityTianjin 300350China

With the increasing power density and integration of electronic devices,polymeric composites with high thermal conductivity(TC)are in urgent demand for solving heat accumulation issues.However,the direct introduction of inorganic fillers into a polymer matrix at low filler content usually leads to low TC enhancement.In this work,an interconnected three-dimensional(3D)polysulfone/hexagonal boron nitride-carbon nanofiber(PSF/BN-CNF)skeleton was prepared via the salt templated method to address this issue.After embedding into the epoxy(EP),the EP/PSF/BN-CNF composite presents a high TC of 2.18 W m^(−1) K^(−1) at a low filler loading of 28.61 wt%,corresponding to a TC enhancement of 990%compared to the neat epoxy.The enhanced TC is mainly attributed to the fabricated 3D interconnected structure and the efficient synergistic effect of BN and CNF.In addition,the TC of the epoxy composites can be further increased to 2.85 W m^(−1) K^(−1) at the same filler loading through a post-heat treatment of the PSF/BN-CNF skeletons.After carbonization at 1500°C,the adhesive PSF was converted into carbonaceous layers,which could serve as a thermally conductive glue to connect the filler network,further decreasing the interfacial thermal resistance and promoting phonon transport.Besides,the good heat dissipation performance of the EP/C/BN-CNF composites was directly confirmed by thermal infrared imaging,indicating a bright and broad application in the thermal management of modern electronics and energy fields.

关键词： Thermal conductivity Boron nitride carbon nanofiber 3D network Epoxy composites

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Reduced Graphene Oxide/carbon nanofiber Based Composite Fabrics with Spider Web‑like Structure for Microwave Absorbing Applications

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Advanced Fiber Materials 2022年第5期4卷 1164-1176页

作者： Xihua Wang Jing Qin Jin Cui Li Huang Ye Yuan Yibin Li School of Materials Science and Technology Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control TechnologyHebei University of TechnologyTianjin 300130People’s Republic of China School of Forensic Science and Technology Criminal Investigation PoliceUniversity of ChinaLiaoning 110854People’s Republic of China School of Electronic and Information Engineering Hebei University of TechnologyTianjin 300130People’s Republic of China School of Materials Science and Engineering Beihang UniversityBeijing 100191People’s Republic of China

Composite fabrics with excellent microwave absorbing performance are highly desired.Herein,reduced graphene oxide/carbon nanofiber(rGO/CNF)based composite fabrics with spider web-like structure were successfully synthesized by electrostatic spinning technique.The spider web-like structure in the composite fabrics provides a connected network for efficient conductive loss of microwave energies.Magnetic loss benefits from the deposited nickel nanoparticles(Ni NPs)anchored in the carbon nanofibers.Meanwhile,the deposited thin polypyrrole(PPy)layers on the conductive network acts as a protective layer for Ni NPs as well as provides abundant interfaces for dissipating electromagnetic energies,which endow the composite fabrics stable microwave absorbing performance.Due to the synergistic effect of microwave absorb-ing mechanism,the maximum reflection loss(RL_(max))of the composite fabric at 6.72 GHz is-46.15 dB,and the effective absorption bandwidth(EAB)is as wide as 8.63 GHz(from 9.37 to 18 GHz).What's more,favorable mechanical and heat insulation properties of the composite fabrics reveal its multifunctional advantages.This rGO/CNF based composite fabric demonstrates a new direction for multifunctional and flexible microwave absorbing materials(MAMs).

关键词： Reduced graphene oxide carbon nanofiber Reflection loss Microwave absorbing applications

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Edge-Oriented Graphene on carbon nanofiber for High-Frequency Supercapacitors

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Nano-Micro Letters 2018年第1期10卷 77-84页

作者： Nazifah Islam Juliusz Warzywoda Zhaoyang Fan Department of Electrical and Computer Engineering and Nano Tech Center Texas Tech University Materials Characterization Center Whitacre College of Engineering Texas Tech University

High-frequency supercapacitors are being studied with the aim to replace the bulky electrolytic capacitors for current ripple filtering and other functions used in power systems. Here, 3 D edge-oriented graphene(EOG)was grown encircling carbon nanofiber(CNF) framework to form a highly conductive electrode with a large surface area. Such EOG/CNF electrodes were tested in aqueous and organic electrolytes for high-frequency supercapacitor development. For the aqueous and the organic cell, the characteristic frequency at-45° phase angle was found to be as high as 22 and 8.5 k Hz, respectively. At 120 Hz, the electrode capacitance density was 0.37 and 0.16 m F cm^(-2) for the two cells. In particular, the 3 V high-frequency organic cell was successfully tested as filtering capacitor used in AC/DC converter, suggesting the promisingpotential of this technology for compact power supply design and other applications.

关键词： High-frequency supercapacitor Kilohertz supercapacitor Vertical graphene carbon nanofiber AC filtering

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=unctional interlayer of PVDF-HFP and carbon nanofiber for long-life lithium-sulfur batteries

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Nano Research 2018年第6期11卷 3340-3352页

作者： Anyi Zhang Xin Fang Chenfei Shen Yihang Liu In Gi Seo Yuqiang Ma Liang Chen Patrick Cottingham Chongwu Zhou Mork Family Department of Chemicol Engineering and Materials Science University of Southern California Los Angeles California 90089 USA Ming Hsieh Department of Electrical Engineering University of Southern California Los Angeles California 90089 USA Department of Physics and Astronomy University of Southern California Los Angeles California 90089 USA Department of Chemistry University of Southern California Los Angeles California 90089 USA

In the present work we develop a scalable and inexpensive design for lithium- sulfur （Li-S） batteries by capping a flexible gel polymer/carbon nanofiber （CNF） composite membrane onto a free-standing and binder-free CNF ＋ ni2s6 cathode, thus achieving a three-dimensional （3D） structural design. The CNF network is used as the current collector and S holder to overcome the insulating nature and volume expansion of S, while the composite membrane comprises a gel polymer poly（vinylidene fluoride-co-hexafluoropropylene）（PVDF-HFP）, and CNF additive is used as an interlayer to trap polysulfides and recycle the remaining S species, leading to a high specific capacity and long cycle life. This 3D structure enables excellent cyclability for 500 cycles at 0.5℃ with a small capacity decay of 0.092% per cycle. Furthermore, an outstanding cycle stability was also achieved at even higher current densities （1.0 to 2.0℃）, indicating its good potential for practical applications of Li-S batteries.

关键词： lithium-sulfur batteries poly（vinylidene fluoride-co-hexafluoropropylene）（PVDF-HFP） gel polymer electrolyte carbon nanofiber conductive network

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Poly dimethylsiloxane/carbon nanofiber nanocomposites: fabrication and characterization of electrical and thermal properties

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International Journal of Smart and Nano Materials 2016年第4期7卷 236-247页

作者： Shoieb Chowdhury Mark Olima Yingtao Liu Mrinal Saha James Bergman Thomas Robison School of Aerospace and Mechanical Engineering University of OklahomaNormanOKUSA NNSA’s National Security Campus operated by Honeywell Kansas CityMOUSA

This article presents the fabrication and characterization of poly dimethylsiloxane/carbon nanofiber(CNF)-based nanocomposites.Although silica and carbon nanoparticles have been traditionally used to reinforce mechanical properties in PDMS matrix nanocom-posites,this article focuses on understanding their impacts on electrical and thermal properties.By adjusting both the silica and CNF concentrations,12 different nanocomposite formulations were studied,and the thermal and electrical properties of these materials were experimentally characterized.The developed nano-composites were prepared using a solvent-assisted method pro-viding uniform dispersion of the CNFs in the polymer matrix.Scanning electron microscopy was employed to determine the dispersion of the CNFs at different length scales.The thermal properties,such as thermal stability and thermal diffusivity,of the developed nanocomposites were studied using thermogravi-metirc and laser flash techniques.Furthermore,the electrical volume conductivity of each type of nanocomposite was tested using the four-probe method to eliminate the effects of contact electrical resistance during measurement.Experimental results showed that both CNFs and silica were able to impact on the overall properties of the synthesized PDMS/CNF nanocomposites.The developed nanocomposites have the potential to be applied to the development of new load sensors in the future.

关键词： Nanocomposites poly dimethylsiloxane carbon nanofiber electrical conductivity thermal stability thermal diffusivity

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Cobalt valence modulating in CoO_(x) incorporated carbon nanofiber for enhanced glucose electrooxidation

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Materials Reports(Energy) 2022年第2期2卷 86-93页

作者： Jiadong Hu Hao Lu Mingsong Li Gang Xiao Min Li Xuemei Xiang Zhisong Lu Yan Qiao Institute for Clean Energy&Advanced Materials School of Materials&EnergySouthwest UniversityChongqing400715PR China

Glucose fuel cells(GFCs)driven by abiotic catalysts are promising green power sources for portable or wearable devices.In this work,a CoO_(x)incorporated carbon nanofiber(CoO_(x)@CNF)catalyst with mixed valences cobalt oxides have been developed through partial oxidation of pyrolyzed electrospun Co^(2+)/poly acrylonitrile fibers.The cobalt valence modulating could be achieved via regulating the incorporation ratio of cobalt acetate in precursors or the oxidation temperature of the pyrolyzed fibers.Electrocatalytic analyses show that the presence of CoO in CoO_(x)@CNF will provide more active sites for glucose electrooxidation,and thus enhance the electrocatalytic performance significantly.As a result,the glucose fuel cell built with the CoO.@CNF anode containing both CoO and Co_(3)O_(4)delivered a maximum power density of 270μW cm^(-2),which is higher than that of other reported Co_(3)O_(4)based GFCs.This work provides a simple strategy to develop excellent transition metal catalysts for GFCs to expand their applications in portable and wearable energy devices.

关键词： Glucose electrooxidation Cobalt oxides Valence modulating carbon nanofiber Wearable glucose fuel cell

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Electroactive shape-memory polymer nanocomposites incorporating carbon nanofiber paper

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International Journal of Smart and Nano Materials 2010年第1期1卷 2-12页

作者： Haibao Lu Yanju Liu Jihua Gou Jinsong Leng Shanyi Du Center for Composite Materials and Structures Harbin Institute of TechnologyHarbin 150001China Department of Aerospace Science and Mechanics No.92 West Dazhi StreetHarbin Institute of Technology(HIT)HarbinChina Department of Mechanical Materials&Aerospace EngineeringUniversity of Central FloridaOrlandoFL 32816USA

A conductive carbon nanofiber(CNF)paper is described for the actuation of shape recovery of a shape-memory polymer(SMP)by electrically resistive Joule heating.The CNF paper was manufactured using a traditional physical vapor deposition process and the microscale morphology and structure of the CNF paper were observed using a scanning electron microscope.The CNF paper was found to be porous,with the pore size determined by the weight concentration of CNF.The excellent electrical properties of pure CNF papers and their SMP composites were characterized by the four-point probe method.Shape recovery actuation of this type of SMP composite induced by electrically resistive heating was achieved with a 12 V voltage.Additionally,the thermomechanical properties of the SMP composite were studied with respect to the volume fraction of CNF paper.

关键词： shape-memory polymer resistive heating electroactive carbon nanofiber

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Fabrication of Silicon/carbon Composite Material with Silicon Waste and carbon nanofiber Applied in Lithium-Ion Battery

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Journal of Environmental Protection 2022年第1期13卷 150-160页

作者： Ying-Yang Li Che-Ya Wu Tzu-Ying Lin Jenq-Gong Duh Department of Materials Science and Engineering NTHU Taiwan

Silicon (Si) is regarded as a promising material for lithium-ion battery anode because of high theoretical capacity. Nevertheless, Si faces particle pulverization and rapid capacity fading due to serious volume change during the lithiation and the delithiation process. In this work, a silicon/carbon composite constituted to Si powder and carbon nanofiber (CNF) is produced to solve the above issues as a new design structure of anode material. The Si powder was recycled from the silicon slicing waste in photovoltaic industry and the CNF was from dry rice straws. By mixing the purified Si powder with CNF, the composite was synthesized by the freeze-drying method and calcination. In the cyclic test, Si adding with 1 wt% CNF showed 3091 mAh/g capacity in the first cycle and 1079 mAh/g capacity after 100 cycles at the current density of 0.5 A/g, which were both better than pristine Si. SEM images also show the composite structure can eliminate cracks on the surface of the electrode during cycling. CNF attaching on Si particles can increase specific surface area, so binder can easily combine the active materials and the conductive materials together. This strategy enhances the structure stability and prevents the electrode from delamination.

关键词： Composite Material carbon nanofiber Waste Silicon Anode Material Lithium-Ion Battery

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Hierarchically porous Co@N-doped carbon fiber assembled by MOF-derived hollow polyhedrons enables effective electronic/mass transport:An advanced 1D oxygen reduction catalyst for Zn-air battery

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Journal of Energy Chemistry 2023年第1期76卷 117-126,I0004页

作者： Yifei Zhang Quanfeng He Zihao Chen Yuqing Chi Junwei Sun Ding Yuan Lixue Zhang Industrial Research Institute of Nonwovens&Technical Textiles College of Textiles&ClothingQingdao UniversityQingdao 266071ShandongChina College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071ShandongChina College of Chemistry and Chemical Engineering Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM)Xiamen UniversityXiamen 361005FujianChina

Developing advanced oxygen reduction reaction(ORR)electrocatalysts with rapid mass/electron transport as well as conducting relevant kinetics investigations is essential for energy technologies,but both still face ongoing challenges.Herein,a facile approach was reported for achieving the highly dispersed Co nanoparticles anchored hierarchically porous N-doped carbon fibers(Co@N-HPCFs),which were assembled by core-shell MOFs-derived hollow polyhedrons.Notably,the unique one-dimensional(1D)carbon fibers with hierarchical porosity can effectively improve the exposure of active sites and facilitate the electron transfer and mass transfer,resulting in the enhanced reaction kinetics.As a result,the ORR performance of the optimal Co@N-HPCF catalysts remarkably outperforms that of commercial Pt/C in alkaline solution,reaching a limited diffusion current density(J)of 5.85 m A cm^(-2)and a half-wave potential(E_(1/2))of 0.831 V.Particularly,the prepared Co@N-HPCF catalysts can be used as an excellent air-cathode for liquid/solid-state Zn-air batteries,exhibiting great potentiality in portable/wearable energy devices.Furthermore,the reaction kinetic during ORR process is deeply explored by finite element simulation,so as to intuitively grasp the kinetic control region,diffusion control region,and mixing control region of the ORR process,and accurately obtain the relevant kinetic parameters.This work offers an effective strategy and a reliable theoretical basis for the engineering of first-class ORR electrocatalysts with fast electronic/mass transport.

关键词： Oxygen reduction catalyst Metal-organic frameworks carbon nanofiber Hierarchically porous structure Diffusion kinetics Zn-air battery

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