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MXene Enhanced 3D Needled Waste Denim Felt for High‑Performance Flexible Supercapacitors

Nano-Micro Letters 2024年第2期16卷 383-394页

作者： Wei Fan Qi Wang Kai Rong Yang Shi Wanxi Peng Handong Li Zhanhu Guo Ben Bin Xu Hua Hou Hassan Algadi Shengbo Ge Key Laboratory of Functional Textile Material and Product of the Ministry of Education School of Textile Science and EngineeringInstitute of Flexible electronics and Intelligent TextileXi’an Polytechnic UniversityXi’an 710048People’s Republic of China Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037People’s Republic of China Henan Province International Collaboration Lab of Forest Resources Utilization School of ForestryHenan Agricultural UniversityZhengzhou 450002People’s Republic of China Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Electrical Engineering Faculty of EngineeringNajran University11001 NajranSaudi Arabia

MXene,a transition metal carbide/nitride,has been prominent as an ideal electrochemical active material for supercapacitors.However,the low MXene load limits its practical applications.As environmental concerns and sustainable development become more widely recognized,it is necessary to explore a greener and cleaner technology to recycle textile by-products such as cotton.The present study proposes an effective 3D fabrication method that uses MXene to fabricate waste denim felt into ultralight and flexible supercapacitors through needling and carbonization.The 3D structure provided more sites for loading MXene onto Z-directional fiber bundles,resulting in more efficient ion exchange between the electrolyte and electrodes.Furthermore,the carbonization process removed the specific adverse groups in MXenes,further improving the specific capacitance,energy density,power density and electrical conductivity of supercapacitors.The electrodes achieve a maximum specific capacitance of 1748.5 mF cm-2 and demonstrate remarkable cycling stability maintaining more than 94%after 15,000 galvanostatic charge/discharge cycles.Besides,the obtained supercapacitors present a maximum specific capacitance of 577.5 mF cm^(-2),energy density of 80.2μWh cm^(-2)and power density of 3 mW cm^(-2),respectively.The resulting supercapacitors can be used to develop smart wearable power devices such as smartwatches,laying the foundation for a novel strategy of utilizing waste cotton in a high-quality manner.

关键词： MXene 3D needled waste denim felt Supercapacitors Carbonization

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Ferroelectric BaTiO_(3) /Pr_(2)O_(3) heterojunction harvesting roomtemperature cold–hot alternation energy for efficiently pyrocatalytic dye decomposition

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Journal of Advanced Ceramics 2024年第1期13卷 44-52页

作者： Zheng Wu Taosheng Xu Luohong Zhang Tingting Liu Zhansheng Wu Gangqiang Zhu Yanmin Jia School of Environmental and Chemical Engineering Xi’an Key Laboratory of Textile Chemical Engineering AuxiliariesXi’an Polytechnic UniversityXi’an 710048China School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710062China

The strong pyrocatalytic dye decomposition of the BaTiO_(3)/Pr_(2)O_(3) heterojunction catalyst under cold–hot alternation conditions has been demonstrated in this work.For pure BaTiO_(3) nanofibers,~54%rhodamine B(RhB)dye is decomposed under the cold–hot alternation of 29–57℃.With the loading content of Pr_(2)O_(3) increases from 0 to 4 wt%,the pyrocatalytic decomposition ratio of RhB solution increases first and then decreases,eventually achieving a maximum of 91%at 3 wt%.The enhanced pyrocatalytic performance after loading Pr_(2)O_(3) can be attributed to an internal electric field of the heterojunction,which effectively separates positive and negative charges.The strongly pyrocatalytic performance of BaTiO_(3)/Pr_(2)O_(3) makes it hopeful for applications in the dye wastewater treatment through harvesting the environmental cold–hot temperature alternation thermal energy in future.

关键词： pyroelectric materials BaTiO_(3) pyrocatalysis BaTiO_(3)/Pr_(2)O_(3)heterojunction dye decomposition

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温轧路径对钛/钢爆炸复合板抗剪切强度的影响

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稀有金属材料与工程 2023年第6期52卷 2010-2016页

作者：李博新牛嘉乐封志斌莫太骞王鹏举西安工程大学材料工程学院陕西西安710048 贵州大学机械工程学院贵州贵阳550025 重庆宏江机械有限公司重庆402160

对爆炸复合的钛/钢复合板进行了一道次60%的温轧,研究了一道次温轧钛/钢爆炸复合板的近界面微观组织及剪切强度。结果显示,一道次温轧工艺可以引起钛层和钢层近界面组织的显著剪切变形。由于剪切变形,钛层形成了RD分散织构。钢层含有高... 详细信息

对爆炸复合的钛/钢复合板进行了一道次60%的温轧,研究了一道次温轧钛/钢爆炸复合板的近界面微观组织及剪切强度。结果显示,一道次温轧工艺可以引起钛层和钢层近界面组织的显著剪切变形。由于剪切变形,钛层形成了RD分散织构。钢层含有高组份的旋转立方织构及低组份的γ纤维织构。对比常规多道次轧制方法,由于剪切变形可细化界面化合物,使得一道次温轧钛/钢复合板抗剪切强度得到提升。

关键词：一道次温轧剪切变形微观组织抗剪切强度

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An ultra-thin piezoelectric nanogenerator with breathable,superhydrophobic,and antibacterial properties for human motion monitoring

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Nano research 2023年第9期16卷 11612-11620页

作者： Wei Fan Cong Zhang Yang Liu Shujuan Wang Kai Dong Yi Li Fan Wu Junhao Liang Chunlan Wang Yingying Zhang School of Textile Science and Engineering Key Laboratory of Functional Textile Material and Product of the Ministry of EducationXi’an Polytechnic UniversityXi’an 710048China Department of Chemistry Tsinghua UniversityBeijing 100084China School of Chemistry Xi’an Jiaotong UniversityXi’an 710049China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083China Department of Materials University of ManchesterManchesterM139PLUK

Piezoelectric nanogenerators(PENGs)are promising for harvesting renewable and abundant mechanical energy with high efficiency.Up to now,published research studies have mainly focused on increasing the sensitivity and output of PENGs.The technical challenges in relation to practicability,comfort,and antibacterial performance,which are critically important for wearable applications,have not been well addressed.To overcome the limitations,we developed an all-nanofiber PENG(ANF-PENG)with a sandwich structure,in which the middle poly(vinylidene fluoride-co-hexafluoropropylene(P(VDF-HFP))/ZnO electrospun nanofibers serve as the piezoelectric layer,and the above and below electrostatic direct-writing P(VDF-HFP)/ZnO nanofiber membranes with a 110 nm Ag layer on one side that was plated by vacuum coating technique serve as the electrode layer.As the ANF-PENG only has 91μm thick and does not need further encapsulating,it has a high air permeability of 24.97 mm/s.ZnO nanoparticles in ANF-PENG not only improve the piezoelectric output,but also have antibacterial function(over 98%).The multifunctional ANF-PENG demonstrates good sensitivity to human motion and can harvest mechanical energy,indicating great potential applications in flexible self-powered electronic wearables and body health monitoring.

关键词： piezoelectric nanogenerator breathability super-hydrophobicity antibacterial performance wearable electronics

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Synthesis of 4-Trifluoromethylated 1,3-Butadienes via Palladium Catalyzed Heck Reaction

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Chinese Journal of Chemistry 2021年第11期39卷 2962-2966页

作者： Yang Li Meng Hao Yu-Chen Chang Yuan Liu Wen-Fei Wang Ning Sun Wen-Qing Zhu Ziwei Gao xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries School of Environmental and Chemical EngineeringXi'an Polytechnic UniversityXi'anShaanxi710048 China School of Chemistry&Chemical Engineering Yan'an UniversityYan'anShaanxi716000 China xinjiang Normal university UrumchiXinjiang650100 China

1,3-Butadiene plays a key role in modern synthetic chemistry and biochemistry because it is a key intermediate in the synthesis of many drugs.A new and effective method for the synthesis of 4-trifluoromethylated 1,3-butadiene through the fluorinated Heck reaction catalyzed by Pd(0)is described.Without additives,1-chloro-3,3,3-trifluoropropene(an inexpensive CF3 structural unit that is harmless to ozone)reacts with enamide to synthesize 4-trifluoromethylated 1,3-butadienes with good yield,high regioselectivity and chemical selectivity,and strong tolerance of substrate functional groups such as alkynes,aldehyde,and ester groups.

关键词： 1,3-Butadienes Trifluoromethylated Heck reaction Palladium Synthetic method

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Base-Promoted Formylation and N-Difluoromethylation of Azaindoles with Ethyl Bromodifluoroacetate as a Carbon Source

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Chinese Journal of Chemistry 2021年第6期39卷 1477-1482页

作者： Yang Li Ning Sun Cai-Lin Zhang Meng Hao xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries School of Environmental and Chemical EngineeringXi'an Polytechnic UniversityXi'anShaanxi 710048China

We reported for the first time that ethyl bromodifluoroacetate directly reacts with azaindole without transition metal catalysis to produce a difluoromethyl protected 5-aldehyde group product in one step.It is worth mentioning that the reacted aldehyde group is only formed at the 5 position.In addition,this method has good substrate applicability and functional group tolerance.Finally,we also carried out some mechanism auxiliary experiments,which confirmed that the aldehyde-based carbon comes from ethyl bromodifluoroacetate.

关键词： Azaindoles C1 building blocks Difluoromethylene Hydrolysis Synthetic methods

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Dielectric spectroscopy studies of ZnO single crystal

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Chinese Physics B 2013年第10期22卷 529-532页

作者：成鹏飞李盛涛王辉 School of Science Xi'an Polytechnic University State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University

Dielectric relaxation and charge transport induced by electron hopping in ZnO single crystal are measured by using a novocontrol broadband dielectric spectrometer. Typical Debye-like dielectric relaxation originating from electronic hopping between electronic traps and conductive band in surface Schottky barrier region is observed for ZnO single crystal-Au electrode system. However, after insulation of ZnO single crystal by heat treatment in rich oxygen atmosphere, dielectric relaxation and alternating current conductance are observed simultaneously in the dielectric spectra, implying that dielectric relaxation and charge transport can be induced simultaneously by electronic hopping at high temperature in an ordered system. The intrinsic correlation between local dielectric relaxation and long range charge transport offers us a new method to explore complicated dielectrics.

关键词： ZnO single crystal electronic hopping conductance dielectric relaxation

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Micro-mechanical model for predicting the elasto-plastic behavior of composites based on secant formulation method

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Chinese Journal of Aeronautics 2021年第1期34卷 281-295页

作者： Junhao LIANG xinhai HE Wenlong TIAN School of Materials Science&Engineering Xi'an Polytechnic UniversityXi'an 710048China Shaanxi Key Laboratory of Surface Engineering and Remanufacturing Xi'an UniversityXi'an 710048China School of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 710072China

To predict the Elasto-Plastic Behaviors(EPBs)of aligned inclusions reinforced composites,this paper develops an interpolative Mori-Tanaka/Double-Inclusion(MT-DI)homogenization model with the secant formulation,and gives the numerical implementation algorithms of the developed MT-DI model with the secant formulation.The Finite Element(FE)homogenization method is implemented to provide the "exact" EPBs of the composites and thus validate the MT-DI model with the secant formulation.The MT-DI model with the 2 nd-order secant formulation is validated to provide the more accurate predictions,while the MT-DI model with the 1 st-order secant formulation always gives the stiffer predictions.The results show that using the macro-stress and macrostrain as the inputs,the MT-DI model with the secant formulation gives the identical predictions.The predictions of the MT-DI model with the secant formulation vary between those of the MT and DI models with the secant formulation.Meanwhile,the MT-DI model with the secant formulation does not predict the accurate EPBs for the phases of the composites.

关键词： Elasto-plastic behavior FE homogenization Mean-field homogenization MT-DI model Secant formulation

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Preparation and Characterization of Electrospun Polylactic Acid Micro/Nanofibers under Different Solvent Conditions

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Fluid Dynamics & Materials Processing 2021年第3期17卷 629-638页

作者： Hao Dou Hongxia Liu Feng Wang Yanli Sun School of Textile Science and Engineering Xi’an Polytechnic UniversityXi’an710048China State Key Laboratory of Intelligent Textile Material and Products Xi’an Polytechnic UniversityXi’an710048China

Electrospinning is a versatile and popular method for the fabrication of ultrafine fibers and many parameters in electrospinning can be adjusted when ideal micro/nanofibers are required.In particular,the selection of a proper solvent condition is a fundamental and crucial step to produce electrospun ultrafine fibers.In this study,a commonly used biomaterial,polylactic acid(PLA),was dissolved in 7 different solvents and PLA micro/nanofibers were prepared by electrospinning.The morphology,porosity,mechanical property and static contact angle were characterized to determine the quality of the obtained product.The results show that different solvent conditions have a significant effect on both the diameter,surface smooth degree of PLA micro/nanofibers and the properties of the fibrous membranes.

关键词： PLA micro/nanofibers solvent conditions electrospinning

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Non-UV Photoelectric Properties of the Ni/n-Si/N+-SiC Isotype Heterostructure Schottky Barrier Photodiode

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Chinese Physics Letters 2013年第9期30卷 149-152页

作者：李连碧陈治明任占强高战军 Department of Electronic Engineering Xi’an University of TechnologyXi’an 710048 School of Science Xi’an Polytechnic UniversityXi’an 710048

The energy-band structure and non-ultraviolet photoelectric properties of a Ni/n-Si/N^(+)-SiC isotype heterostruc-ture Schottky photodiode are simulated by using Silvaco-Atlas.There are energy offsets in the conduction and valance band of the heterojunction,which are about 0.09eV and 1.79eV,respectively.The non-UV photodiode with this structure is fabricated on a 6H-SiC(0001)substrate.𝐾J–V𝑊measurements indicate that the device has good rectifying behavior with a rectification ratio up to 200 at 5V,and the turn-on voltage is about 0.7V.Under non-ultraviolet illumination of 0.6W/cm^(2),the device demonstrates a significant photoelectric response with a photocurrent density of 2.9mA/cm^(2)and an open-circuit voltage of 63.0mV.Non-ultraviolet operation of the SiC-based photoelectric device is initially realized.

关键词： Schottky heterojunction Si/N

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