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A carbon nanofiber network for stable lithium metal anodes with high Coulombic efficiency and long cycle life

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Nano Research 2016年第11期9卷 3428-3436页

作者： Anyi Zhang Xin Fang Chenfei Shen Yihang Liu Chongwu Zhou Mork Family Department of Chemical Engineering and Materials Science University of Southern California Los Angeles 90089 USA Ming Hsieh Departmen t of Electrical Engineering University of Southern California Los Angeles 90089 USA

Li metal is considered one of the most promising candidates for the anode material in high-energy-density Li-ion batteries. However, the dendritic growth of Li metal during the plating/stripping process can severely reduce Coulombic efficiency and cause safety problems, which is a key issue limiting the application of Li metal anodes. Herein, we present a novel strategy for dendrite-free deposition of Li by modifying the Cu current collector with a three-dimensional carbon nanofiber （CNF） network. Owing to the large surface area and high conductivity of the CNF network, Li metal is inserted into and deposited onto the CNF directly, and no dendritic Li metal is observed, leaving a flat Li metal surface. With Li metal as the counter electrode for Li deposition, an average Coulombic efficiency of 99.9% was achieved for more than 300 cycles, at large current densities of 1.0 and 2.0 mA·cm^-2, and with a high Li loading of 1 mAh·cm^-2. The scalability of the preparation method and the impressive results achieved here demonstrate the potential for the application of our design to the future development of dendrite-free Li metal anodes.

关键词： lithium-ion batteries lithium metal anode carbon nanofiber three-dimensionalconductive network

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 ***,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 *** 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 ***,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

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 ***,the direct introduction of inorganic fillers into a polymer matrix at low filler content usually leads to low TC *** 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 *** 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 *** enhanced TC is mainly attributed to the fabricated 3D interconnected structure and the efficient synergistic effect of BN and *** 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 *** 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 ***,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

Co/carbon nanofiber with adjustable size and content of Co nanoparticles for tunable microwave absorption and thermal conductivity

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Journal of Materiomics 2024年第1期10卷 124-133页

作者： Shaohua Shi Pengpeng Mou Dao Wang Xiangying Li Shengjie Teng Maofan Zhou Xiaolong Yu Zhen Deng Gengping Wan Guizhen Wang State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikouHainan570228China Department of Radiology Central South University Xiangya School of Medicine Affiliated Haikou HospitalHaikou570208China College of Science Qiongtai Normal UniversityHaikouHainan571127China Sanya Nanfan Research Institute of Hainan University Hainan Yazhou Bay Seed LaboratorySanya572025China

Electromagnetic pollution and heat dissipation problems are becoming increasingly worthy of attention due to the rapid development of electronic devices,which puts forward an urgent demand for microwave absorbers with excellent thermal management ***,high-performance Co/carbon nanofiber(Co/CNF)microwave absorbers with high thermal conductivity were fabricated by facile step-by-step *** microwave absorption properties can be readily tuned by adjusting the content and size of Co nanoparticles through concentration gradient *** from the formation of dielectric and magnetic coupling network,Co/CNF composites possess intensive dipole polarization,interface polarization,and magnetic *** optimal Co/CNF composites exhibit outstanding microwave absorption performance with a minimum reflection loss(RL)of−53.0 dB at 11.44 GHz,and a maximum effective absorption bandwidth(EAB)of 5.5 *** addition,the thermal conductivities of the Co/CNF-natural rubber(Co/CNF-NR)composites are significantly *** work may inspire the exploration of high-efficiency heat-conduction microwave absorbers based on CNF.

关键词： carbon nanofiber Co nanoparticle Microwave absorption Heat conductivity

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

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 ***,reduced graphene oxide/carbon nanofiber(rGO/CNF)based composite fabrics with spider web-like structure were successfully synthesized by electrostatic spinning *** spider web-like structure in the composite fabrics provides a connected network for efficient conductive loss of microwave *** loss benefits from the deposited nickel nanoparticles(Ni NPs)anchored in the carbon ***,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 *** 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 *** 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

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 *** 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 *** cobalt valence modulating could be achieved via regulating the incorporation ratio of cobalt acetate in precursors or the oxidation temperature of the pyrolyzed *** 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 *** 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 *** 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

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 *** 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 *** adjusting both the silica and CNF concentrations,12 different nanocomposite formulations were studied,and the thermal and electrical properties of these materials were experimentally *** developed nano-composites were prepared using a solvent-assisted method pro-viding uniform dispersion of the CNFs in the polymer *** electron microscopy was employed to determine the dispersion of the CNFs at different length *** thermal properties,such as thermal stability and thermal diffusivity,of the developed nanocomposites were studied using thermogravi-metirc and laser flash ***,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 *** results showed that both CNFs and silica were able to impact on the overall properties of the synthesized PDMS/CNF *** 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

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 *** 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 *** CNF paper was found to be porous,with the pore size determined by the weight concentration of *** excellent electrical properties of pure CNF papers and their SMP composites were characterized by the four-point probe *** recovery actuation of this type of SMP composite induced by electrically resistive heating was achieved with a 12 V ***,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