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用于个人热管理的具有商业化前景的辐射制冷织物

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Science Bulletin 2022年第3期67卷 229-231页

作者：张鑫刘春太申长雨刘宪虎 National Engineering Research Center for advanced Polymer Processing Technology Key Laboratory of Advanced Material Processing&Mold(Ministry of Education)Zhengzhou UniversityZhengzhou 450002China

With global warming,the need for cooling is soaring.About 15%of the world’s electricity consumption and 10%of greenhouse gas emissions are due to cooling systems[1],mainly because a large amount of cooling load is used to reduce the temperature of the environment or objects and cannot be efficiently applied to the human body.Therefore,personal thermal management(PTM)as an efficient cooling method has gained widespread attention in recent years[2,3].Researchers from Stanford University have successfully produced nano-polyethylene that can effectively reduce the temperature of the human body fabric[4].However,to ensure a high transmittance of the fabric through the atmospheric window(wavelength:8<λ<13μm),its thickness is limited.The effect of solar heat transfer increases as the thickness of the fabric decreases,so fabrics that can effectively manage human heat remain a challenge.

关键词：辐射制冷 gained fabric

Unraveling structure evolution failure mechanism in MoS_(2)anode for improving lithium storage stability

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Journal of materials Science & Technology 2022年第33期128卷 245-253页

作者： Guannan Zu Shiyu Xu Changhao Wang Hongyi Li Manchen Zhang Xiaoxing Ke Yuxiang Hu Ruzhi Wang Jinshu Wang key laboratory of advanced Functional materials of education ministry of china Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Beijing key laboratory of microstructure and Properties of Solids Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China

2 H phase molybdenum disulfide(2 H-MoS_(2))possesses the two-dimensional layered structure and high theoretical capacity,presenting excellent lithiation-delithiation property.However,the violent capacity decay within dozens of cycles still remains a great challenge due to lacking of in-depth failure mechanism.Herein,a novel decay-recovery-decay failure phenomenon upon long-term cycles is reported for the first time,which originates from the slow size change of Mo nanoparticles(NPs).Decay stages are triggered by many irregular-shaped Mo NPs with the increasing size up to~15 nm,leading to prominent pseudocapacitance failure and capacity loss.Subsequent recovery stages are attributed to the pulverization of coarse Mo NPs through surface sulfurization and accompanying lithiation.To overcome the instability issue,proper modifiers should be introduced to restrain the spontaneous growth of Mo NPs,such as aluminum oxide(Al_(2)O_(3)).The strong Mo-Al_(2)O_(3)bond gradually"drags"Al_(2)O_(3)fragments into the active material as the cycle continuously proceeds,resulting in the efficient refinement and the reversible conversion between Mo and MoS_(2).Therefore,the enhanced cycling stability and the capacity retention are successfully achieved.It is expected to provide a new insight into the energy storage of transition metal chalcogenide anode materials in rechargeable batteries.

关键词： 2H-MoS_(2) Decay-recovery-decay Mo nanoparticles Al_(2)O_(3) Enhanced cycling stability

Bidirectionally aligned MXene hybrid aerogels assembled with MXene nanosheets and microgels for supercapacitors

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Rare Metals 2023年第4期42卷 1249-1260页

作者： Pei-Xuan Li Guo-Zhen Guan Xin Shi Lei Lu Yu-Chao Fan Jie Xu Yuan-Yuan Shang Ying-Jiu Zhang Jin-Quan Wei Feng-Mei Guo key laboratory of material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou450052China key Lab for advanced materials Processing Technology of education ministry State Key Lab of New Ceramic and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing100084China

MXene nanomaterials are one of the most promising electrode material candidates for supercapacitors owing to their high conductivity,abundant surface functional groups and large surface area.However,electrodes based on MXene may result in low ion-accessible surface area and blocked ion transport pathways because of the self-restacking of MXene nanosheets.It is essential to suppress the self-res tacking of nanosheets and increase the electrochemical active sites in order to optimize the electrode.In this work,bidirectionally aligned MXene hybrid aerogel(A-MHA)assembled with MXene nanosheets and microgels is prepared using a facile bidirectional freeze casting and freeze-drying method.The bidirectionally aligned structure together with the three-dimensional structured microgels in the A-MHAs,can improve the ionaccessible surface area and provide more barrier-free channels by exposing more active sites and ensuring electrolyte transport freely.The A-MHA with MXene microgels content of 40 wt%exhibits a high specific capacitance of 760 F·g^(-1)at 1 A·g^(-1)and a remarkable cyclic performance of 97%after 10,000 cycles at100 mV·s^(-1)in 1 mol·L^(-1)H_(2)SO_(4)electrolyte.A-MHAs show remarkable electrochemical properties and are of potential application in energy storage.

关键词： MXene MXene microgels Bidirectionally aligned structure Electrodes Supercapacitors

Effect of Mn and Mo on microstructure and mechanical properties of Al-Si-Cu-Mg-0.6Fe alloy

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china Foundry 2023年第6期20卷 511-518页

作者： Hao He Jing Zou Hai-tao Zhang Da-chuan Hu Zhi-jun Feng Yu-fei Li Ze-hua Li Hua-cheng Li National key laboratory of advanced Casting Technologies Shenyang 110022China key laboratory of Electromagnetic Processing of materials Ministry of EducationNortheastern UniversityShenyang 110819China

Effect of different Mn and Mo contents on microstructure and mechanical properties of Al-Si-Cu-Mg-0.6Fe alloy was studied.Results indicate that the increase of Mo and decrease of Mn lead to a decrease in the size of theα-Al_(15)(FeMnMo)_(3)Si_(2) phase formed during solidification.Theα-Al_(15)(FeMnMo)_(3)Si_(2) phase reaches a minimum value of about 16.3μm at 0.2wt.%Mo and 0.1wt.%Mn addition.After solution treatment,theα-Al(FeMnMo)Si dispersed phase is precipitated.When only Mn is added,theα-Al(FeMnMo)Si dispersed phase mainly distributes near the grain boundaries,while when only Mo is added,it primarily distributes in the central region of the matrix.When both Mn and Mo are added,the dispersed phase has a larger and denser dispersed region and is uniformly distributed near the Al matrix and grain boundaries.Moreover,the best overall mechanical properties of the alloy are obtained with the combined addition of 0.1wt.%Mn and 0.2wt.%Mo,due to the smaller size ofα-Al_(15)(FeMnMo)_(3)Si_(2) phase and the larger area fraction and higher density of theα-Al(FeMnMo)Si dispersed phase.The yield strength,ultimate tensile strength,and elongation are respectively improved 67.7 MPa,48.5 MPa and 5.3%,respectively,compared to that of the alloy with only 0.3wt.%Mn.

关键词： Al-Si-Cu-Mg-0.6Fe alloy Mn and Mo microstructure mechanical properties solution treatment

Improved distortion prediction in additive manufacturing using an experimental-based stress relaxation model

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Journal of materials Science & Technology 2020年第24期59卷 83-91页

作者： Ruishan Xie Qingyu Shi Gaoqiang Chen State key laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China key laboratory for advanced material Processing Technology Ministry of EducationBeijing 100084China

In additive manufacturing(AM),numerous thermal cycles make stress relaxation a significant factor in affecting the material mechanical response.However,the traditional material constitutive model cannot describe repeated annealing behavior.Here,we propose an improved constitutive model based on a serial of stress relaxation experiments,which can descript the temperature and time-dependent stress relaxation behavior during AM.By using the proposed relaxation model,the prediction accuracy is significantly improved due to the recovery of inelastic strain during multilayer deposition.The results are validated by both in-situ and final distortion measurements.The influence mechanism of the relaxation behavior on material mechanical response is explained by the three-bar model in thermo-elastic-plastic theory.The relaxation behavior during the whole AM process is clarified.The stress behavior is found to have a limited effect when merely depositing several layers;nevertheless,it becomes a prominent impact when depositing multiple layers.The proposed model can enhance modeling accuracy both in AM and in multilayer welding.

关键词： Additive manufacturing Welding Thermo-mechanical modeling Distortion prediction Stress relaxation

Progress on nanostructured gel catalysts for oxygen electrocatalysis

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Nano Research 2022年第12期15卷 10343-10356页

作者： Huan Yang Huilin Hu Chenfeng Xia Feng You Junlong Yao Xueliang Jiang Bao Yu Xia Wuhan Institute of Technology Hubei Key Laboratory of Plasma Chemistry and Advanced MaterialsSchool of Materials Science and EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationWuhan430205China key laboratory of material Chemistry for Energy Conversion and Storage(ministry of education) Hubei Key Laboratory of Material Chemistry and Service FailureWuhan National Laboratory for OptoelectronicsSchool of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)Wuhan430074China

Driven by the serious ecological problems,it is urgent to explore high-efficiency sustainable energy technologies.Oxygen electrocatalysis acts as important half-reactions in the emerging electrochemical energy techniques including electrolysis and batteries.Gel composites exhibit the merits of rich porous,superior hydrophilic,and large specific surface area,which can significantly improve the electrolyte penetration and boost the kinetics process of oxygen electrocatalysis.In this invited contribution,the advances and challenges of a novel gel materials for oxygen electrocatalysis are summarized.Starting from the structure-activity-performance relationship of gel materials,synthetic routes of nanostructured gel materials,namely,radical polymerization,sol-gel method,hydrothermal/solvothermal reactions,and ligand-substitution method,are introduced.Afterward,the gel composites are divided into polymer-based,metal-based,and carbon-based materials in turn,and their applications in oxygen electrocatalysis are discussed respectively.At the end,the perspective and challenges for advanced gel oxygen electrocatalysts are proposed.

关键词： oxygen electrocatalysis gel materials polymer metal carbon

Conversion reaction lithium metal batteries

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Nano Research 2023年第6期16卷 8219-8252页

作者： Wenbo Lu Zhaopeng Li Huaifang Shang Lifang Jiao key laboratory of Magnetic Molecules and Magnetic Information materials(ministry of education) School of Chemistry and Material ScienceShanxi Normal UniversityTaiyuan 030031China key laboratory of advanced Energy materials Chemistry(ministry of education) Renewable Energy Conversion and Storage Center(ReCast)College of ChemistryNankai UniversityTianjin 300071China

Contemporary social problems,such as energy shortage and environmental pollution,require developing green energy storage technologies in the context of sustainable development.With the application of secondary battery technology becoming widespread,the development of traditional lithium(Li)-ion batteries,which are based on insertion/deinsertion reactions,has hit a bottleneck;instead,conversion-type lithium metal batteries(LMBs)have attracted considerable attention owing to the high theoretical capacity of Li metal anodes.In this review,Li-S,Li-O_(2),and Li-SOCl_(2)batteries are used as examples to summarize LMBs based on their conversion reactions from the perspectives of cathode material,anode material,electrolyte,separator,and current collector.key challenges exist regarding the conversion reactions of various batteries.To achieve the optimum performance and improve the application effect,several improvement strategies have been proposed in relation to reasonable designs of next-generation high-performance rechargeable batteries.

关键词： lithium(Li)metal batteries conversion reaction lithium-sulfur battery lithium-oxygen battery lithium-SOCl_(2)battery

microstructure and mechanical properties improvements in cemented carbides by(Cr,Mo,Ta)_(2)(C,N) inhibitors

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Rare Metals 2021年第3期40卷 679-686页

作者： Jie Tang Ying Liu Jin-Wen Ye Zhi-Nan Cao Shi-Qing Ma Xiao-Jiao Yang School of materials Science and Engineering Sichuan UniversityChengdu 610065China key laboratory of advanced Special material and Technology Ministry of EducationChengdu 610065China

Grain growth inhibitors can effectively suppress the grain size of tungsten carbide(WC),and consequently improve the hardness and strength of the cemented carbides;however,the toughness,one of the most important properties,usually deteriorates with inhibitors.Here,(Cr,Mo,Ta)_(2)(C,N) synthesized by carbothermal reductionnitridation was used as a novel inhibitor,and its effects on the microstructure and mechanical properties of the cemented carbides were investigated.The results showed that the cemented carbides containing(Cr,Mo,Ta)_(2)(C,N)outperformed its counterpart comprising the traditional inhibitors in comprehensive mechanical properties,which was mainly attributed to the better inhibition performance provided by the(Cr,Mo,Ta)_(2)(C,N) solid-solution powders.With the content of(Cr,Mo,Ta)_(2)(C,N) increasing from 0 wt% to 1.25 wt%,the average grain size of WC in the cemented carbides decreased from 0.85 to 0.60 μm firstly,and then increased to 0.64 μm.With 1.00 wt%(Cr,Mo,-Ta)_(2)(C,N) addition,the cemented carbides with the best performance of hardness(HV_(30)) of 15.55 GPa,transverse rupture strength of 4272 MPa,fracture toughness of13.91 MPa·m1/2 were obtained.The electron backscattered diffraction(EBSD) measurements showed that cemented carbides with(Cr,Mo,Ta)_(2)(C,N) processed more amount of∑2 boundary compared with the other specimens,which contributed to better fracture resistance.

关键词： Cemented carbides microstructure Mechanical properties (Cr,Mo,Ta)_(2)(C,N) Electron backscattered diffraction(EBSD)

Kernels-Different Au_(25) Nanoclusters Enhanced Catalytic Performance via Modification of Ligand and Electronic Effects

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Chinese Journal of Chemistry 2022年第21期40卷 2575-2581页

作者： Mei Qu Fang Xue Jiang-Yu Wei Miao-Miao Qiao Wei-Qi Ren Shi-Li Li Xian-Ming Zhang key laboratory of Magnetic Molecules and Magnetic Information of ministry of education School of Chemistry and Material ScienceShanxi Normal UniversityTaiyuanShanxi 030006China College of Chemistry Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan Universityof TechnologyTaiyuanShanxi 030024China

Ultrasmall atomically precise thiolate-protected gold nanoclusters with surface open sites are crucial for practical applications in catalysis.However,there is a lack of systematic studies that unify the kernels-isomerization,modification of peripheral ligands and electronic effects into one system,as well as their correlation to catalytic performances.In this work,three structurally related Au_(25)nanoclusters with reported star Au_(25) kernels,Au_(25)-i-FTP,Au_(25)-bi-FTP,and Au_(25)-bi-CHT have been synthesized through two different methods:one-pot direct reduction and two-step reduction by using AsPh3 as converter.Their structures and catalytic performance have been comparatively investigated.Au_(25)-i-FTP has a classic Au13 core capped by six dimeric RS-Au-SR-Au-SRs,while Au_(25)-bi-FTP and Au_(25)-bi-CHT feature typical rod-shaped biicosahedral geometric kernel.All of the three Au_(25) clusters were effective catalysts for oxidation of organosilanes,different from conclusions obtained in literature.Especially,the nanorod-type Au_(25)-bi-CHT clusters protected by flexible thiol ligands showed very good catalytic performance in this reaction,the conversion and selectivity were close to 100%within 5 min.The ligand rigidity and electron effects work together to modulate the catalytic properties.The findings inspire us to rethink kernel and ligand effects on catalytic property,and the principle demonstrated here will possibly be widely-used in high active atom-precise catalysts.

关键词： Gold Nanocluster Atom-Precise Catalysis Silanols