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 synth...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).展开更多
Carbon nanofibers(CNFs)with excellent conductivity and stability have become a promising material to design the strain sensing network.To date,however,the effect of the stacked structure of CNF membrane on the sensing...Carbon nanofibers(CNFs)with excellent conductivity and stability have become a promising material to design the strain sensing network.To date,however,the effect of the stacked structure of CNF membrane on the sensing performance has rarely been stu-died.In this work,we reported a high-performance sensor based on the cross-stacked aligned CNF membrane.The effects of crossstacked structures on the sensing characteristics were systemati-cally investigated.The flexible strain sensor could capture low detection limit(<0.1%)with a gauge factor(GF)of 4.24 and wide strain range up to 130%.The uniform GF value reached 2050 when the strain was in the range of 100-130%.In addition,the high linearity under 40%strain(>0.998),excellent durability and quick response time(<200 ms)were demonstrated.The excellent com-prehensive performances were simultaneously obtained.The sen-sor could be used in extensive applications,such as monitoring body movements and distinguishing the track of writing.展开更多
Herein, some fundamental open questions on engineering of “super” hydrogen sorption (storage) in carbonaceous nanomaterials are considered, namely: 1) on thermodynamic stability and related characteristics of some h...Herein, some fundamental open questions on engineering of “super” hydrogen sorption (storage) in carbonaceous nanomaterials are considered, namely: 1) on thermodynamic stability and related characteristics of some hydrogenated graphene layers nanostructures: relevance to the hydrogen storage problem;2) determination of thermodynamic characteristics of graphene hydrides;3) a treatment and interpretation of some recent STM, STS, HREELS/LEED, PES, ARPS and Raman spectroscopy data on hydrogensorbtion with epitaxial graphenes;4) on the physics of intercalation of hydrogen into surface graphene-like nanoblisters in pyrolytic graphite and epitaxial graphenes;5) on the physics of the elastic and plastic deformation of graphene walls in hydrogenated graphite nanofibers;6) on the physics of engineering of “super” hydrogen sorption (storage) in carbonaceous nanomaterials, in the light of analysis of the Rodriguez-Baker extraordinary data and some others. These fundamental open questions may be solved within several years.展开更多
Fuel cells,rechargeable metal–air batteries,metal-ion batteries,and supercapacitors have been regarded as prospective energy sources technologies to replace the fossil energy.Moreover,electrochemical sensors also hav...Fuel cells,rechargeable metal–air batteries,metal-ion batteries,and supercapacitors have been regarded as prospective energy sources technologies to replace the fossil energy.Moreover,electrochemical sensors also have been successfully developed as promising platforms for detecting pollutants,drug analysis,and healthcare monitoring.Electrospinning is a scalable and suitable technique to design and fabricate diverse nanofibers and their nanocomposites for key components in electrochemical applications.Herein,a comprehensive review of electrospinning,from the technological innovations to the novel electrospun composite nanofibers,is provided.More importantly,the recent advances on the diverse components of electrochemical devices are highlighted,followed with the detailed discussion about the corresponding enhancement mechanism based on the electrospun nanomaterials.Finally,the currently faced challenges on the fabrication of electrospun nanomaterials are raised and a brief perspective for the future development of electrospun nanomaterials-based electrochemical applications is prospected.展开更多
基金supported by the Natural Science Foundation of China(51902083,62104060)the Foundation Strengthening Program(2019-JCJQ-142-00)+2 种基金Natural Science Foundation of Hebei Province(F2021202066)Higher Education Science and Technology Research Project of Hebei Province(ZD2019087,ZD2021027)Star of Science and Technology in Hebei University of Technology(JBKYXX2001).
文摘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).
基金This work was supported by the Jiangsu Planned Projects for Postdoctoral Research Funds[2020Z251]Primary Research&Developement Plan of Jiangsu Province[BE2019045]+1 种基金Science and Technology Guidance Project of China National Textile and Apparel Council[2020102]Third-Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘Carbon nanofibers(CNFs)with excellent conductivity and stability have become a promising material to design the strain sensing network.To date,however,the effect of the stacked structure of CNF membrane on the sensing performance has rarely been stu-died.In this work,we reported a high-performance sensor based on the cross-stacked aligned CNF membrane.The effects of crossstacked structures on the sensing characteristics were systemati-cally investigated.The flexible strain sensor could capture low detection limit(<0.1%)with a gauge factor(GF)of 4.24 and wide strain range up to 130%.The uniform GF value reached 2050 when the strain was in the range of 100-130%.In addition,the high linearity under 40%strain(>0.998),excellent durability and quick response time(<200 ms)were demonstrated.The excellent com-prehensive performances were simultaneously obtained.The sen-sor could be used in extensive applications,such as monitoring body movements and distinguishing the track of writing.
文摘Herein, some fundamental open questions on engineering of “super” hydrogen sorption (storage) in carbonaceous nanomaterials are considered, namely: 1) on thermodynamic stability and related characteristics of some hydrogenated graphene layers nanostructures: relevance to the hydrogen storage problem;2) determination of thermodynamic characteristics of graphene hydrides;3) a treatment and interpretation of some recent STM, STS, HREELS/LEED, PES, ARPS and Raman spectroscopy data on hydrogensorbtion with epitaxial graphenes;4) on the physics of intercalation of hydrogen into surface graphene-like nanoblisters in pyrolytic graphite and epitaxial graphenes;5) on the physics of the elastic and plastic deformation of graphene walls in hydrogenated graphite nanofibers;6) on the physics of engineering of “super” hydrogen sorption (storage) in carbonaceous nanomaterials, in the light of analysis of the Rodriguez-Baker extraordinary data and some others. These fundamental open questions may be solved within several years.
基金supported by National Natural Science Foundation of China(No.22303057)Fundamental Research Funds for Central Universities.
文摘Fuel cells,rechargeable metal–air batteries,metal-ion batteries,and supercapacitors have been regarded as prospective energy sources technologies to replace the fossil energy.Moreover,electrochemical sensors also have been successfully developed as promising platforms for detecting pollutants,drug analysis,and healthcare monitoring.Electrospinning is a scalable and suitable technique to design and fabricate diverse nanofibers and their nanocomposites for key components in electrochemical applications.Herein,a comprehensive review of electrospinning,from the technological innovations to the novel electrospun composite nanofibers,is provided.More importantly,the recent advances on the diverse components of electrochemical devices are highlighted,followed with the detailed discussion about the corresponding enhancement mechanism based on the electrospun nanomaterials.Finally,the currently faced challenges on the fabrication of electrospun nanomaterials are raised and a brief perspective for the future development of electrospun nanomaterials-based electrochemical applications is prospected.
