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Dense carbon nanofiber self-supporting electrode fabricated by orientation/compaction strategy for high volumetric lithium storage capacity

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Progress in Natural science:Materials International 2025年第1期35卷 229-237页

作者： Haihui Liu Chaoqun Chen Qiang Xu Yan Song Xiangwu Zhang Chang Ma Tianjin Municipal Key Lab of Advanced Fiber and Energy Storage Technology Tiangong University CAS Key Laboratory of Carbon Materials Institute of Coal Chemistry Chinese Academy of Sciences Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science Wilson College of Textiles North Carolina State University

Low bulk density greatly restricts the large-scale application of electrospun carbon-based fiber membrane as electrode in energy storage devices. To solve the above challenges, herein an orientation-compaction densification strategy is proposed to enhance the bulk density and volumetric capacity of PAN-based carbon nanofiber membranes as self-supporting electrode used in lithium-ion batteries（LIBs）. Specifically, highly-oriented fibers are achieved by high-speed roller collecting during electrospinning, and compaction densification is conducted by hot-pressing treatment. The effects of collecting speed and hot-pressing pressure on the morphology, conductivity,bulk density, tensile strength, and flexibility of the obtained carbon nanofiber membrane are *** to conventional fiber membranes, of which fibers are disorderly stacked, the oriented fiber membrane is much easier to achieve dense stacking by compaction. The obtained dense carbon nanofiber membrane demonstrates a bulk density of 0.566 g cm-3, and shows a significantly-enhanced volumetric capacity(318.3 mA h cm-3), high-rate performance(86.6 mA h cm-3at 5 A g-1), and satisfactory cycling stability when used as selfsupporting electrode of LIBs.

关键词： Bulk density Densification Electrospinning Orientation-compaction Volumetric capacity

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Biological porous carbon encapsulated polyethylene glycol-based phase change composites for integrated electromagnetic interference shielding and thermal management capabilities

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Journal of Materials science & technology 2022年第18期113卷 147-157页

作者： Shuang Liu Mengjie Sheng Hao Wu Xuetao Shi Xiang Lu Jinping Qu Key Laboratory of Material Chemistry for Energy Conversion and Storage Huazhong University of Science&TechnologyMinistry of EducationWuhan 430074PR China Hubei Engineering Research Center for Biomaterials and Medical Protective Materials Huazhong University of Science&TechnologyWuhan 430074PR China Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical EngineeringHuazhong University of Science&TechnologyWuhan 430074PR China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern PolytechnicalUniversityXi’an 710072China School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023PR China

The development of functional composites with excellent thermal management capabilities and electro-magnetic interference(EMI)shielding has become extremely urgent for keeping up with the continuous improvement of the operating speed and efficiency for electronic *** this study,the biolog-ical wood-derived porous carbon(WPC)was determined as the supporting material to encapsulating polyethylene glycol(PEG),and a series of WPC/PEG/Fe_(3)O_(4) phase change composites(PCCs)with excel-lent shape stability,EMI shielding and thermal management capabilities were prepared via a simple vac-uum impregnation *** Fe_(3)O_(4) magnetic particles modified PCCs have greatly improved the EMI shielding effectiveness(SE).The EMI SE of WP-4(7.5 wt.% Fe_(3)O_(4) in PEG)can be up to 55.08 dB between 8.2−12.4 GHz,however,the WP-0 without Fe_(3)O_(4) addition is only 40.08 ***,the absorption ratio of electromagnetic waves(EMW)has also increased from 75.02%(WP-0)to 85.56%(WP-4),which effectively prevents secondary *** addition,after wrapping a thin layer of polydimethylsiloxane resin(PDMS),the obtained WP-4 can maintain a high heat storage capacity(109.52 J/g)and good wa-ter *** short,the prepared WPC/PEG/Fe_(3)O_(4) PCCs have great potential application value in the thermal management and electromagnetic shielding requirements for electronic devices.

关键词： Biological wood-derived porous carbon Polyethylene glycol Phase change composites Thermal management Electromagnetic interference shielding

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High‑Speed Sirospun Conductive Yarn for Stretchable Embedded Knitted Circuit and Self‑Powered Wearable Device

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Advanced Fiber Materials 2023年第1期5卷 154-167页

作者： Li Niu Jin Wang Kai Wang Heng Pan Gaoming Jiang Chaoyu Chen Pibo Ma Engineering Research Center of Knitting Technology Ministry of EducationCollege of Textile Science and EngineeringJiangnan UniversityWuxi 214122China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China

In the intelligent era,the textile technique is a high efficiency,mature and simple manufacturing solution capable of fabricat-ing fully flexible wearable ***,the external circuit with its integration and comfort limitations cannot satisfy the requirements of intelligent wearable and portable *** study presents an industrialized production method to fabricate core–shell structure conductive yarn for direct textile use,prepared by the high-speed sirospun *** integration and flexibility are significantly improved over previous *** sirospun conductive yarn(SSCY)and the intarsia technique can provide the SSCY seamless and convenient embedded knitted circuit(SSCY-EKC)to form a full textile electrical element as the channel of power and signals transmission,allowing for a stable resistance change and wide strain range for meeting practical *** based on the triboelectric nanogenerator(SSCY-TENG)can be designed as a caution carpet with attractive design and good washability for a self-powered sensor that recognizes human ***,intrinsic textile properties such as washability,softness,and comfort *** benefits such as excellent extension,fitting,and stretchability,the SSCY-EKC used herein can realize a fully flexible electrical textile with a high potential for physical detection,body gesture recognition,apparel fashion,and decoration.

关键词： Sirospun technique Embedded knitted circuit Intarsia technique Stretchable Wearable devices

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Facile preparation of coal-based ultramicroporous carbon microspheres for selective CO_(2)capture

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Carbon Resources Conversion 2024年第3期7卷 97-105页

作者： Mei An Tuo Guo Qingjie Guo Jiangmen Laboratory of Carbon Science and Technology the Hong Kong University of Science and Technology(Guangzhou)JiangmenGuangzhou 529000China State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering School of Chemistry and Chemical EngineeringNingxia UniversityYinchuanNingxia 750021China Key Laboratory of Clean Chemical Engineering in Universities of Shandong College of Chemical EngineeringQingdao University of Science&TechnologyQingdao 266042China

The basic structure of aromatic compounds that are abundant in coal is the carbonaceous precursor derived from carbon ***,it remains to be a huge challenge to prepare carbon microspheres using coal due to the complex construction and composition of ***,a simple and viable way to obtain coal-based microporous carbon microspheres was developed by means of ethanol pyrolysis and a sequential extraction *** as-prepared carbon microsphere featured aspherical micron particles of a uniform size(0.6-1.6㎛),abundant O-functional groups,excellent thermal stability,high SBET(415.5-983.2 m^(2)/g),and plentiful ultra-micropores(63.15-72.72%).The coal-based carbon microsphere exhibited a noteworthy CO_(2)uptake(3.19-4.97 mmol/g at 273 K and 1.0 bar),acceptable CO_(2)/N_(2)selectivity(IAST:23-46)and moderate isosteric heats(20-32 kJ/mol).This synthetic strategy is important for the preparation of ultramicroporous carbon microspheres using coal,and the synthetic carbon microspheres have promising prospects for highly efficient CO_(2)capture.

关键词： Coal Ultramicroporous Carbon microspheres Ethanolysis Sequential extraction CO_(2)capture

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Steering CO_(2) electroreduction to hydrocarbons over 2D thiol-based conductive metal-organic framework

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science Bulletin 2025年第7期70卷 1107-1117页

作者： Qiu-Jin Wu Duan-Hui Si Yu-Liang Dong Qian Chen Li-Li Han Rong Cao Yuan-Biao Huang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China University of Chinese Academy of Sciences Beijing 100049China

Almost all of Cu_(x)S compounds only produce the simple two-electron transferred products CO and HCOOH but it remains a large challenge to obtain the multiple-electron transferred hydrocarbon products in electrocatalytic CO_(2)reduction reaction(CO_(2)RR).Moreover,identifying the distinct contributions of S atoms to catalysis,particularly for catalytic activity and product selectivity in electrocatalytic CO_(2)RR,remains a challenging ***,we introduce a model catalyst based on a conductive two-dimensional metalorganic framework with defined Cu-S_(4)active sites,named Cu_(3)(THT)_(2)(THT=2,3,6,7,10,11-hexathiotriphe nylene)for CO_(2)*** the precursor catalyst Cu_(3)(HITP)_(2)with Cu-N_(4)motifs that predominantly produce common two-electron transferred product CO(40%selectivity),Cu_(3)(THT)_(2)shifts the primary product to deep reduction product CH_(4).At-1.4 V versus the reversible hydrogen electrode(RHE),Cu_(3)(THT)_(2)achieves a Faradaic efficiency of 63.5%for CH_(4)and the current density reaches a high value of-298.3 mA cm^(-2).Theoretical studies indicate that the electron-rich Cu-S_(4)sites stabilize and activate the key intermediate*CO more effectively than Cu-N_(4)***,S atoms can accept electrons and form weak S...O interactions with*CO,providing additional stabilization for**** study is the first to show that non-metallic S centers around catalytic metal sites can significantly enhance and tune product selectivity in CO_(2)RR.

关键词： CO_(2)electroreduction Conductive metal-organic framework Methane Copper S atom

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On the Use of Recycled Asphalt and Trinidad Lake Asphalt(TLA)for the Preparation of High Modulus Asphalt Concrete

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Fluid Dynamics & Materials Processing 2023年第7期19卷 1939-1950页

作者： Chao Li Guodong Zeng Yang Fang Hongming Huang Foshan Transportation Science and Technology Co. Ltd.Foshan528315China Key Laboratory of Road Structure and Material of Ministry of Transport(Changsha) Changsha University of Science&TechnologyChangsha410114China

Rutting of asphalt pavement occurs earlier and is more serious under the increasingly heavy traffic load conditions that can be found in subtropical monsoon climate *** modulus asphalt concrete(HMAC)with excellent anti-rutting and anti-fatigue properties is generally used to mitigate this *** the relatively high cost of the additives used in this type of asphalt,in this study the feasibility of using recycled asphalt mixture(RAP)and Trinidad lake asphalt(TLA)for the preparation of HMAC is *** mineral composition of the RAP is first analyzed,then the TLA modified asphalt with different levels of RAP content is used to assess the effect of RAP on the performance of the ***,the high-temperature rheological properties of extracted bitumen and the adhesion characteristic between mineral and bitumen are *** results show that after RAP combustion,the yellowish and greyish minerals display different alkalinity values,while the greyish mineral exhibits an improved ability to combine with ***,RAP can significantly enhance the high-temperature rutting resistance of TLA modified asphalt *** aged bitumen in RAP makes the mixed binder harder and improves its rheological properties at high temperatures.

关键词： Recycled asphalt mixture trinidad lake asphalt high-temperature properties

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Influence of Bromo-Aromatic Substrates on Direct Arylation of EDOTs toward Higher Molecular Conjugate Polymer

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Chinese Journal of Polymer science 2025年第5期43卷 718-729页

作者： Xi-Lin Pei Quan Yang Yan-Lu Sun Wei Wu Jian-Yong Yu Yong He State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai201620China School of Materials Science and Engineering Shanghai UniversityShanghai200444China

The influence of the electronic and steric properties of bromoaromatic substrates on direct arylation polymerization for synthesizing high-molecular-weight conjugated polymers was investigated through a combination of experiments and ***-aromatic substrates with electron-withdrawing fluoro substituents exhibited higher yields and degrees of polymerization under PPh3-assisted conditions compared to those with electron-donating or bulky methyl ***,excessive steric hindrance at ortho-sites or overly electrondeficient dibromoaromatic substrates leads to reaction *** indicated that electron-withdrawing substituents enhanced the electrophilicity of arylpalladium-PPh3intermediates,facilitating the activation of electron-rich arylative substrates and promoting polymer ***,steric hindrance from the substituents can influence the preferred reaction pathway,thereby increasing the real reaction *** experimental and computational results suggest that bromoaromatic substrates with optimized electron-deficient characteristics significantly improve monomer conversion and polymerization efficiency with n-hexylmethylether-substituted *** findings clarify how the electronic and steric properties of bromo-aromatic substrates affect EDOT derivative activation and are expected to aid in optimizing the polymerization conditions for the preparation of high-molecular-weight conjugated polymers.

关键词： 3,4-Ethylenedioxythiophene Direct arylation polymerization Bromo-aromatic substrate Concerted metalation-deptonation

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Experimental Investigation on Flow Pattern and Bubble Behavior during Subcooled Flow Boiling of R1233zd(E)in Parallel Channels

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Journal of Thermal science 2023年第6期32卷 2374-2385页

作者： FANG Yidong ZHANG Zhao XU Dan WANG Yuchen YANG Huinan HUANG Yuqi School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai200093China Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province Jiaxing Research InstituteZhejiang UniversityJiaxing314031China Key Laboratory of Smart Thermal Management Science&Technology for Vehicles of Zhejiang Province Taizhou317200China

In this study,the flow pattern and bubble behavior of R1233zd(E)during subcooled flow boiling in parallel channels are experimentally investigated with visualization and thermal *** test section is composed of 21 rectangular mini channels with the hydraulic diameter of 1.5 mm and the length of 140 *** flow,slug flow,churn flow and wavy-annular flow occur in sequence with the increase of vapor quality,while transient flow pattern transition process involving multiple flow patterns are also *** distribution of flow pattern is non-synchronized and axial-asymmetric,with earlier flow pattern transitions observed in peripheral channels away from the center *** initial nucleate site in each channel also show a random and axial-asymmetric distribution,while faster bubble growth can be noted in some channel under the comprehensive effects of liquid evaporation and bubble *** variation of heat transfer coefficient is correspondence to the flow pattern transition,showing different trends along the flow *** increase of mass flux can lead to delayed flow pattern transition and variation of heat transfer *** addition,higher heat transfer coefficient can be noted in channels away from the center axis.

关键词： flow boiling flow pattern bubble behavior parallel channel visualization

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Observation and analysis of positive leader re-illumination in a 10 m ultra-high voltage transmission line gap under switching impulse voltages

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Plasma science and technology 2024年第10期26卷 93-100页

作者： Biao HUANG Xuan ZHOU She WANG Chijie ZHUANG Rong ZENG Le DENG Eliet Engineering School Changsha University of Science&TechnologyChangsha 410114People’s Republic of China State Key Laboratory of Disaster Prevention&Reduction for Power Grid Changsha University of Science&TechnologyChangsha 410114People’s Republic of China China International Engineering Consulting Co. Ltd.Beijing 100048People’s Republic of China Department of Electrical Engineering Tsinghua UniversityBeijing 100084People’s Republic of China

The leader propagation is one of the most important stages in long air gap *** mechanism behind leader re-illumination remains *** high humidity conditions(20.0–30.1 g/m^(3)),we have conducted experiments of long sparks in a 10 m ultra-high voltage(UHV)transmission line gap under switching impulse *** positive leaders predominantly propagate discontinuously,with almost no significantly continuous propagation *** leader channels are intensely luminous and each elongation segment is straight,with streamers resembling the“branch type”which differs from the“diffuse type”streamers at the front of continuous propagation *** distribution of the propagation velocities is highly random(3.7–18.4 cm/μs),and the average velocity(9.2 cm/μs)significantly exceeds that of continuous propagation(1.5–2.0 cm/μs).Analysis suggests that the current-velocity models suitable for continuous leader propagation do not align well with the experimental data in re-illumination *** on the discharge current waveforms and optical images,it is speculated that the newly elongated leader in re-illumination mode does not evolve gradually from the stem(about 1 cm)but rather evolves overall from a thermal channel much longer than stem.

关键词： long air gap discharge positive leader re-illumination discontinuous leader propagation

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3D printing of glycerol-mediated alginate hydrogels with high strength and stiffness

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材料科学技术（英文版） 2025年第10期213卷 268-275页

作者： Deshuai Kong Biao Yang Hua Yuan Cong Du Yeqiang Tan State Key Laboratory of Bio-Fibers and Eco-Textiles Collaborative Innovation Center of Marine Biobased Fiber and Ecological Textile TechnologyInstitute of Marine Biobased MaterialsCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China

As a biomass material with biodegradability and biocompatibility,sodium alginate(SA)is a good candidate for constructing hydrogels for tissue-mimicking and biomedical scaffold fabricating through extrusion-based 3D printing ***,the mechanical strength and stiffness of alginate hy-drogels are still not comparable with biological tissues such as tendons and the printability of SA so-lutions is often ***,a novel strategy for 3D printing of alginate hydrogels with high mechanical performance is developed by using glycerol as a co-solvent for SA *** addition of glycerol(GL)enables the formation of a homogenous SA/GL solution with a high solid content of 12-20 wt.％and en-dows crosslinked SA hydrogels with high *** applying uniaxial stretches,hydrogel filaments prepared with concentrated SA/GL solutions reveal a high tensile strength of 36.6-161.3 MPa,Young's modulus of 59.2-1964.2 MPa,and elongation at break of 8.5％-106.2％due to the high orientated and closely packed SA ***/GL solutions become more solid-like with increasing SA concentration,and the solution with a solid content of 16 wt.％exhibits optimal 3D printability because of the appropri-ate rheological properties and thixotropic *** designing the deforming-and-fixing process,3D printed high-strength alginate hydrogels with complex structures are prepared,broadening the applica-tion of alginate hydrogels in load-bearing and biomedical fields.

关键词： Sodium alginate 3D printing High strength Anisotropic structure

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