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CHINESE PHYSICS B 2024年第9期33卷 13-28页

作者： Hao, Bing Guo, Jingjing Liu, Peizhi Guo, Junjie Taiyuan Univ Technol Key Lab Interface Sci & Engn Adv Mat Minist Educ Taiyuan 030024 Peoples R China

Electrocatalytic water splitting for hydrogen production is an appealing strategy to reduce carbon emissions and generate renewable fuels. This promising process, however, is limited by its sluggish reaction kinetics and high-cost catalysts. The two-dimensional (2D) transition metal dichalcogenides (TMDCs) have presented great potential as electrocatalytic mat.rials due to their tunable bandgaps, abundant defective active sites, and good chemical stability. Consequently, phase engineering, defect engineering and interface engineering have been adopted to manipulate the electronic structure of TMDCs for boosting their exceptional catalytic performance. Particularly, it is essential to clarify the local structure of catalytically active sites of TMDCs and their structural evolution in catalytic reactions using atomic resolution electron microscopy and the booming in situ technologies, which is beneficial for exploring the underlying reaction mechanism. In this review, the growth regulation, characterization, particularly atomic configurations of active sites in TMDCs are summarized. The significant role of electron microscopy in the understanding of the growth mechanism, the controlled synthesis and functional optimization of 2D TMDCs are discussed. This review will shed light on the design and synthesis of novel electrocatalysts with high performance, as well as prompt the application of adv.nced electron microscopy in the research of mat.rials science.

关键词： TMDCs STEM hydrogen energy conversion active site identification 68.37.Ma 88.30.-k 71.23.-k 73.22.-f EVOLUTION PERFORMANCE

Zeolites for the separation of ethylene, ethane, and ethyne

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FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING 2024年第9期18卷 108-0页

作者： Wang, Binyu Li, Qiang Zhang, Haoyang Zhang, Jia-Nan Pan, Qinhe Yan, Wenfu Jilin Univ Coll Chem State Key Lab Inorgan Synth & Preparat Chem Changchun 130012 Peoples R China Zhengzhou Univ Coll Mat Sci & Engn Key Lab Adv Energy Catalyt & Funct Mat Preparat Zhengzhou 450012 Peoples R China Hainan Univ Sch Chem & Chem Engn Key Lab Adv Mat Trop Isl Resources Minist Educ Haikou 570228 Peoples R China

The cost-effective separation of ethylene (C2H4), ethyne (C2H2), and ethane (C2H6) poses a significant challenge in the contemporary chemical industry. In contrast to the energy-intensive high-pressure cryogenic distillation process, zeolite-based adsorptive separation offers a low-energy alternative. This review provides a concise overview of recent adv.ncements in the adsorptive separation of C2H4, C2H2, and C2H6 using zeolites or zeolite-based adsorbents. It commences with an examination of the industrial significance of these compounds and the associated separation challenges. Subsequently, it systemat.cally examines the utilization of various types of zeolites with diverse cationic species in such separation processes. And then it explores how different zeolitic structures impact adsorption and separation capabilities, considering principles such as cation-pi interaction, pi-complexation, and steric separation concerning C2H4, C2H2, and C2H6 molecules. Furthermore, it discusses methods to enhance the separation performance of zeolites and zeolite-based adsorbents, encompassing structural design, modifications, and ion exchange processes. Finally, it summarizes current research trends and future directions, highlighting the potential application value of zeolitic mat.rials in the field of C2H4, C2H2, and C2H6 separation and offering recommendations for further investigation.

关键词： zeolite ethylene ethane cation-pi interaction pi-complexation ADSORPTIVE SEPARATION CARBON-DIOXIDE C2H4 PURIFICATION FRAMEWORKS SORBENTS REMOVAL

Preparation and magnetic hardening of low Ti content (Sm,Zr)(Fe,Co,Ti)12 magnets by rapid solidification non-equilibrium method

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CHINESE PHYSICS B 2024年第9期33卷 576-580页

作者： Zhang, Xing-Feng Liu, Li-Bin Li, Yu-Qing Zhang, Dong-Tao Liu, Wei-Qiang Yue, Ming Beijing Univ Technol Coll Mat Sci & Engn Key Lab Adv Funct Mat Minist Educ China Beijing 100124 Peoples R China

The Sm-Zr-Fe-Co-Ti quinary-alloys with ThMn12 structure has attracted wide attention for ultra-high intrinsic magnetic properties, showing potentiality to be developed into rare-earth permanent magnets. The Ti element in alloys is crucial for phase stability and magnetic properties, and lower Ti content can increase intrinsic magnetic properties but reduce phase stability. In this study, the 1:12 single-phase melt-spun ribbons with low Ti content was successfully prepared using a rapid solidification non-equilibrium method for the Sm1.1Zr0.2Fe9.2Co2.3Ti0.5 quinary-alloy. However, this non-equilibrium ribbon did not achieve good magnetic hardening due to the uneven microstructure and microstrain. Then, annealing was carried out to eliminate micro-strain and homogenize microstructure, therefore, remanence and coercivity were significantly improved even the precipitation of a small amount of alpha-Fe phase which were not conducive to coercivity. The remanence of 86.1 emu/g and coercivity of 151 kA/m was achieved when annealing at 850 degrees C for 45 min. After hot pressing, under the action of high temperature and pressure, a small portion of ThMn12 phases in the magnet decompose into Sm-rich phases and alpha-Fe, while remanence of 4.02 kGs (1 Gs = 10(-4) T), and coercivity of 1.12 kOe (1 Oe = 79.5775 A & sdot;m(-1)) were still acquired. Our findings can provide reference for exploring practical permanent magnets made of 1:12 type quinary-alloys.

关键词： magnetic mat.rials (Sm,Zr)(Fe,Co,Ti)(12) magnets nanocrystalline magnet microstructure 75.50.Ww 75.75.-C 75.75.Cd THMN12 STRUCTURE ALLOYS MICROSTRUCTURE NANOCOMPOSITES NANOSTRUCTURES EVOLUTION SM

Gel electrolyte based high-performance fiber battery

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SCIENCE BULLETIN 2024年第18期69卷 2811-2813页

作者： Gan, Linli Lei, Mengdie Cai, Guangming Xu, Weilin Wuhan Text Univ State Key Lab New Text Mat & Adv Proc Technol Wuhan 430200 Peoples R China

Batteries have experienced rapid development due to their outstanding energy storage performance and widespread *** progress has driven adv.ncements in electric vehicles,energy storage systems,and portable electronic devices,while also increasing demand for lightweight designs,high energy density,and environmental sustainability[1].However,traditional rigid batteries face significant challenges related to mechanical flexibility,safety,and environmental impact,making them unsuitable for the unique requirements of these emerging applications[2].Consequently,flexible fiber batteries have emerged,leveraging innovations in mat.rials and structural design to offer energy solutions capable of bending,stretching,and adapting to various complex *** batteries hold great potential in applications such as wearable devices[3],flexible electronics[4],smart textiles[5,6],and biomedical devices[7].Traditional lithium-ion batteries are widely used due to their high energy density and long cycle life.

关键词： battery performance fiber

Dealloyed TiCuMn efficiently catalyze the NO reduction and Zn-NO batteries

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FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING 2024年第9期18卷 101-0页

作者： Zhang, Lang Hou, Tong Liu, Weijia Wu, Yeyu Wei, Tianran Ding, Junyang Liu, Qian Luo, Jun Liu, Xijun Guangxi Univ Sch Resources Environm & Mat State Key Lab Featured Met Mat & Life Cycle Safety MOE Key Lab New Proc Technol Nonferrous Met & Mat Nanning 530004 Peoples R China Guangxi Minzu Univ Sch Chem & Chem Engn Key Lab Chem & Engn Forest Prod State Ethn Affairs CommissGuangxi Collaborat Inno Nanning 530006 Peoples R China Tianjin Univ Technol Inst New Energy Mat & Low Carbon Technol Sch Mat Sci & Engn Tianjin 300384 Peoples R China Chengdu Univ Inst Adv Study Chengdu 610106 Peoples R China Univ Elect Sci & Technol China Shenzhen Inst Adv Study ShenSi Lab Shenzhen 518110 Peoples R China

Electrocatalytic NO reduction reaction offers a sustainable route to achieving environmental protection and NH3 production targets as well. In this work, a class of dealloyed Ti60Cu33Mn7 ribbons with enough nanoparticles for the high-efficient NO reduction reaction to NH3 is fabricated, reaching an excellent Faradaic efficiency of 93.2% at -0.5 V vs reversible hydrogen electrode and a high NH3 synthesis rate of 717.4 mu molh(-1)mg(cat).(-1) at -0.6 V vs reversible hydrogen electrode. The formed nanoparticles on the surface of the catalyst could facilitate the exposure of active sites and the transportation of various reactive ions and gases. Meanwhile, the Mn content in the TiCuMn ribbons modulates the chemical and physical properties of its surface, such as modifying the electronic structure of the Cu species, optimizing the adsorption energy of N* atoms, decreasing the strength of the NO adsorption, and eliminating the thermodynamic energy barrier, thus improving the NO reduction reaction catalytic performance. Moreover, a Zn-NO battery was fabricated using the catalyst and Zn plates, generating an NH3 yield of 129.1 mu molh(-1)cm(-2) while offering a peak power density of 1.45 mWcm(-2).

关键词： nitric oxide reduction NH3 electrosynthesis TiCuMn alloy Mn modulation Zn-NO battery NITRIC-OXIDE AMMONIA WATER

Recyclab.e High-performance Carbon Fiber Reinforced Epoxy Composites Based on Dithioacetal Covalent Adaptive Network

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CHINESE JOURNAL OF POLYMER SCIENCE 2024年第10期42卷 1514-1524页

作者： Shi, Gui-Lian Li, Ting-Cheng Zhang, Dao-Hong Zhang, Jun-Heng South Cent Minzu Univ Hubei R&D Ctr Hyperbranched Polymers Synth & Appli Key Lab Catalysis & Energy Mat Chem Minist Educ Wuhan 430074 Peoples R China South Cent Minzu Univ Hubei R&D Ctr Hyperbranched Polymers Synth & Appli Hubei Key Lab Catalysis & Mat Sci Wuhan 430074 Peoples R China Wuhan Text Univ State Key Lab New Text Mat & Adv Proc Technol Wuhan 430200 Peoples R China Hubei Univ Key Lab Green Preparat & Applicat Funct Mat Minist Of Educ Wuhan 430062 Peoples R China

Recycling of carbon fiber reinforced composites is important for sustainable development and the circular economy. Despite the use of dynamic chemistry, developing high-strength recyclab.e CFRPs remains a major challenge due to the mutual exclusivity between the dynamic and mechanical properties of mat.rials. Here, we developed a high-strength recyclab.e epoxy resin (HREP) based on dynamic dithioacetal covalent adaptive network using diglycidyl ether bisphenol A (DGEBA), pentaerythritol tetra(3-mercapto-propionate) (PETMP), and vanillin epoxy resin (VEPR). At high temperatures, the exchange reaction of thermally activated dithioacetals accelerated the rearrangement of the network, giving it significant reprocessing ability. Moreover, HREP exhibited excellent solvent resistance due to the increased cross-linking density. Using this high-strength recyclab.e epoxy resin as the mat.ix and carbon fiber modified with hyperbranched ionic liquids (HBP-AMIM+PF6-) as the reinforcing agent, high performance CFRPs were successfully prepared. The tensile strength, interfacial shear strength (IFSS) and interlaminar shear strength (ILSS) of the optimized formulation (HREP20/CF-HBPPF6) were 1016.1, 70.8 and 76.0 MPa, respectively. In addition, the CFRPs demonstrated excellent solvent and acid/alkali-resistance. The CFRPs could completely degrade within 24 h in DMSO at 140 degrees C, and the recycled CF still maintained the same tensile strength and ILSS as the original after multiple degradation cycles.

关键词： Epoxy resin Hyperbranched ionic liquid Recycling Carbon fiber Composites FIBER/EPOXY COMPOSITES IMPROVEMENT

Solidification Simulation of Investment Castings of Single Crystal Hollow Turbine Blade

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Journal of mat.rials Science & Technology 2003年第6期19卷 532-534页

作者： Jiarong LI, Shizhong LIU, Hailong YUAN and Zhengang ZHONGNational Key lab.ratory of adv.nced High Temperature Structural mat.rials, Beijing Institute of Aeronautical mat.rials, Beijing 100095, China lab. of adv. High Temp. mat. Beijing Inst. of Aero. Mat. Beijing 100095 China

The three-dimensional solidification simulation of the investment castings of single crystal hollow turbine blade at the withdrawal rates of 2 mm/min, 4.5 mm/min and 7 mm/min has been performed with the finite element thermal analysis. The calculated results are in accordance with the experimental ones. The results show that with the increase of withdrawal rate the concave curvature of the liquidus isotherm is larger and larger, and the temperature gradients of the blades increase. No effects of withdrawal rate on the distribution of the temperature gradients of the starter and helical grain selector of the blades are observed at withdrawal rates of 2 mm/min, 4.5 mm/min and 7 mm/min. The relatively high temperature gradient between 500℃/cm and 1000℃/cm in the starter and helical grain selector is obtained at three withdrawal rates.

关键词： Single crystal Hollow turbine blade Solidification simulation

AMORPHIZATION IN Nb-M (M=Fe, Co, Ni) BINARY METAL SYSTEMS INDUCED BY ION BEAM ASSISTED DEPOSITION (IBAD)

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Acta Metallurgica Sinica(English Letters) 2002年第2期15卷 160-166页

作者： F.Pan, F. Zeng and B. Zhao lab.ratory of adv.nced mat.rials, Department of mat.rials and Engineering, Tsinghua University, Beijing 100084, China lab. of adv. mat. Dept. of Mat. and Eng. Tsinghua Univ. Beijing 100084 China

Ion beam assisted deposition technique (IBAD) was utilized to systemat.cally study amorphization in binary metal systems of Nb-magnetic element, i.e., Nb-M (M=Fe, Co or Ni). The glass forming range termed as Nb fraction of Nb-Fe system was about 34at.% to 56at.%, that of Nb-Co system was about 32at.% to 72at.% and that of Nb-Ni about 20at. % to 80at. %. Similar percolation patterns were found in amorphous alloy films. The fractal dimensions of the percolation patterns approach to 2, which indicates 2-D layer growth for amorphous phases. It is regarded that the assisted Ar+ ion beam during the deposition process plays important role for the 2-D layer growth. Some metastable crystalline phases were obtained in these three systems by IBAD, e.g., bcc supersaturated solid solutions in Nb-Fe and Nb-Co systems, fcc and hcp phases in Nb-Co and Nb-Ni systems. The format.on and competing between the amorphous and the metastable crystalline phases were determined by both the phases' thermodynamic states in binary metal systems and kinetics during IBAD process.

关键词： amorphization ion beam assisted deposition glass forming range metastable phase

A New hcp Phase Formed in the Ni-Nb System during Ion-beam-assisted Deposition

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Journal of mat.rials Science & Technology 2004年第5期20卷 577-579页

作者： Bin ZHAO, Kuiwei GENG, Fei ZENG and Feng PANlab.ratory of adv.nced mat.rials, Department of mat.rials Science and Engineering, Tsinghua University, Beijing 100084, China lab. of adv. mat. Dept. of Mat. Sci. and Eng. Tsinghua Univ. Beijing 100084 China

The Ni80Nb20 films were prepared by ion beam assisted deposition (IBAD) with various Ar+ ion energies. A phase evolution of fcc→amorphous→Ni+Nb→Ni+hcp was observed with the increasing of ion beam energy from 2 keV to 8 keV. When bombarded by Ar+ ions of 8 keV during deposition, a new crystalline phase with hcp structure was obtained, of which the lattice parameters are a=0.286 nm and c=0.483 nm, different from those of the similar A3B-type hcp phase previously reported. The experimental results were discussed in terms of thermodynamics and restricted kinetic conditions in the far-from-equilibrium process of IBAD. The format.on of hep phase may also be related to the valence electron effect.

关键词： Hcp phase Ni-Nb Ion beam assisted deposition Thermodynamics Valence electron effect

MAGNETIC PERFORMANCE TRANSITION IN Fe/Tb MULTILAYERS INDUCED BY INTERFACE ROUGHNESS

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Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 532-538页

作者： F. Yang, T. He and F. Pan (lab.ratory of adv.nced mat.rials, Department of mat.rials Science and Engineering, Tsinghua University, Beijing 100084, China) lab. of adv. mat. Dept. of Mat. Sci. and Eng. Tsinghua Univ. Beijing 100084 China

Fe/Tb multilayers with various Fe layer thickness and fixed Tb layer thickness were prepared by e-beam alternate vapor deposition. Analyses of the microstructure of these films show that the magnetic performance is strongly affected by the interface structure. Fe in the films evolved to amorphous phase and the Fe/Tb interface became indiscernible with decreasing Fe thickness. At the same time, the film was observed to perform superparamagnetically, which is quite different from the ferromagnetic behavior of Fe/Tb multilayers that have sharp Fe/Tb interface. Our work shows that the interface roughness has strong influence to the properties of magnetic multilayers.

关键词： Interfaces (mat.rials) Iron Magnetic properties Surface roughness Terbium