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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 materials (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

Electronic structure engineering of transition metal dichalcogenides for boosting hydrogen energy conversion electrocatalysts

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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 materials 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 advanced electron microscopy in the research of materials 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

Effect of antioxidants on the efficiency of jet milling and the powder characteristics of Sm2Co17 permanent magnets

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CHINESE PHYSICS B 2024年第9期33卷 615-620页

作者： Xu, Da-Shuai Liu, Lei Yuan, Jian-Hui Zhou, Bo Dong, Chuang-Hui Wang, Feng-Qing Ding, Yong Sun, Ying-Li Yan, A-Ru Shanghai Univ Engn Sci Sch Mat Sci & Engn Shanghai 201620 Peoples R China Chinese Acad Sci Ningbo Inst Mat Technol & Engn Zhejiang Prov Key Lab Magnet Mat & Applicat Techno CAS Key Lab Magnet Mat & DevicesCISRI Ningbo 315201 Peoples R China Chinese Acad Sci Ningbo Inst Mat Technol & Engn NIMTE Joint Innovat Ctr Rare Earth Permanent Magne CAS Key Lab Magnet Mat & DevicesZhejiang Prov Key Ningbo 315201 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

This study investigated the effect of antioxidants on the grinding efficiency, magnetic powder characteristics, microstructure, and magnetic properties of 2:17 type SmCo permanent magnet materials. The results show that adding antioxidants helps improve the dispersion among magnetic powders, leading to a 33.3% decrease in jet milling time and a 15.8% increase in magnet powder production yield. Additionally, adding antioxidants enhances the oxidation resistance of the magnetic powders. After being stored in a constant temperature air environment at 25 degrees C for 48 h, the O content in the powder decreased by 33% compared to samples without antioxidants. While in the magnet body, the O content decreased from 0.21 wt.% to 0.14 wt.%, which helps increase the effective Sm content and domain wall pinning uniformity in the magnet. Excellent magnetic properties were obtained in the magnet with added antioxidants: B-r = 11.6 kGs, SF = 79.6%, H-cj = 16.8 kOe, and (BH)(max) = 32.5 MGOe.

关键词： antioxidant SmCo permanent magnet oxidation resistance grinding efficiency GRAIN-BOUNDARY CU PHASE FE MICROSTRUCTURE TEMPERATURE ZR PERFORMANCE COERCIVITY OXIDATION

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

Recent advances and practical challenges of high-energy-density flexible lithium-ion batteries

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FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING 2024年第8期18卷 91-0页

作者： Zhang, Guangxiang Chen, Xin Ma, Yulin Huo, Hua Zuo, Pengjian Yin, Geping Gao, Yunzhi Fu, Chuankai Harbin Inst technol State Key Lab Space Power Sources Harbin 150001 Peoples R China Harbin Inst technol Sch Chem & Chem Engn MIIT Key Lab Crit Mat Technol New Energy Convers & Harbin 150001 Peoples R China

With the rapid iteration and update of wearable flexible devices, high-energy-density flexible lithium-ion batteries are rapidly thriving. Flexibility, energy density, and safety are all important indicators for flexible lithiumion batteries, which can be determined jointly by material selection and structural design. Here, recent progress on high-energy-density electrode materials and flexible structure designs are discussed. Commercialized electrode materials and the next-generation high-energy-density electrode materials are analyzed in detail. The electrolytes with high safety and excellent flexibility are classified and discussed. The strategies to increase the mass loading of active materials on the electrodes by designing the current collector and electrode structure are discussed with keys of representative works. And the novel configuration structures to enhance the flexibility of batteries are displayed. In the end, it is pointed out that it is necessary to quantify the comprehensive performance of flexible lithium-ion batteries and simultaneously enhance the energy density, flexibility, and safety of batteries for the development of the next-generation high-energy-density flexible lithium-ion batteries.

关键词： lithium-ion batteries flexibility high energy density safety HIGH-POWER DENSITY THIN-FILM BATTERY RECENT PROGRESS CURRENT COLLECTORS CARBON CLOTH METAL ANODES STORAGE ELECTROLYTES PERSPECTIVES FLEXIBILITY

Discharge mode and particle transport in radio frequency capacitively coupled Ar/O2 plasma discharges

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CHINESE PHYSICS B 2024年第9期33卷 451-460页

作者： Gao, Zhuo-Yao Dong, Wan Tian, Chong-Biao Jiang, Xing-Zhao Dai, Zhong-Ling Song, Yuan-Hong Dalian Univ technol Sch Phys Key Lab Mat Modificat Laser Ion & Electron Beams Minist Educ Dalian 116024 Peoples R China

Simulations are conducted on capacitively coupled Ar/O-2 mixed gas discharges employing a one-dimensional fluid coupled with an electron Monte Carlo (MC) model. The research explores the impact of different O-2 ratio and pressures on the discharge characteristics of Ar/O-2 plasma. At a fixed Ar/O-2 gas ratio, with the increasing pressure, higher ion densities, as well as a slight increase in electron density in the bulk region can be observed. The discharge remains dominated by the drift-ambipolar (DA) mode, and the flux of O(P-3) at the electrode increases with the increasing pressure due to higher background gas density, while the fluxes of O(D-1) and Ar* decrease due to the pronounced loss rate. With the increasing proportion of O-2, a change in the dominant discharge mode from alpha mode to DA mode can be detected, and the O-2-associated charged particle densities are significantly increased. However, Ar+ density shows a trend of increasing and then decreasing, while for neutral fluxes at the electrode, Ar* flux decreases, and O(P-3) flux increases with the reduced Ar gas proportion, while trends in O(D-1) flux show slight differences. The evolution of the densities of the charged particle and the neutral fluxes under different discharge parameters are discussed in detail using the ionization characteristics as well as the transport properties. Hopefully, more comprehensive understanding of Ar/O-2 discharge characteristics in this work will provide a valuable reference for the industry.

关键词： Ar/O-2 mixed gas discharges electron dynamics transport of charged and neutral particles CHEMISTRY DEPOSITION SIO2

Giant reversible barocaloric effects with high thermal cycle stability in epoxybonded (MnCoGe)0.96(CuCoSn)0.04 composite

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INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND matERIALS 2024年第11期31卷 2528-2534页

作者： Kuang, Yafei Tao, Kun Yang, Bo Tong, Peng Zhang, Yan Sun, Zhigang Zhang, Kewei Wang, Dunhui Hu, Jifan Zuo, Liang Taiyuan Univ Sci & technol Coll Mat Sci & Engn Taiyuan 030024 Peoples R China Taiyuan Univ Sci & technol Shanxi Key Lab Magnet & Elect Funct Mat & Applicat Taiyuan 030024 Peoples R China Chinese Acad Sci Inst Solid State Phys Key Lab Mat Phys Hefei 230031 Peoples R China Northeastern Univ Sch Mat Sci & Engn Key Lab Anisotropy & Texture Mat Minist Educ Shenyang 110819 Peoples R China Hangzhou Dianzi Univ Sch Elect & Informat Hangzhou 310018 Peoples R China

Hexagonal MnMX-based (M = Co or Ni, X = Si or Ge) alloys exhibit giant reversible barocaloric effects. However, giant volume expansion would result in the as-cast MnMX ingots fragmenting into powders, and inevitably bring the deterioration of mechanical properties and formability. Grain fragmentation can bring degradation of structural transformation entropy change during cyclic application and removal of pressure. In this paper, giant reversible barocaloric effects with high thermal cycle stability can be achieved in the epoxy bonded (MnCoGe)(0.96)(CuCoSn)(0.04) composite. Giant reversible isothermal entropy change of 43.0 J center dot kg(-1)center dot K-1 and adiabatic temperature change from barocaloric effects (Delta T-BCE) of 15.6 K can be obtained within a wide temperature span of 30 K at 360 MPa, which is mainly attributed to the integration of the change in the transition temperature driven by pressure of -101 K center dot GPa(-1) and suitable thermal hysteresis of 11.1 K. Further, the variation of reversible Delta T-BCE against the applied hydrostatic pressure reaches up to 43 K center dot GPa(-1), which is at the highest level among the other reported giant barocaloric compounds. More importantly, after 60 thermal cycles, the composite does not break and the calorimetric curves coincide well, demonstrating good thermal cycle stability.

关键词： barocaloric effects cycle stability reversible isothermal entropy change reversible adiabatic temperature change MnCoGe alloys ALLOY TRANSFORmatION EXPANSION PRESSURE

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 advancements 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 materials 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

Isoindigo nanoparticles for photoacoustic imaging-guided tumor photothermal therapy

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CHINESE JOURNAL OF CHEMICAL ENGINEERING 2024年第8期72卷 19-25页

作者： Pei, Yao Wang, Ran Rong, Xiang Xia, Xiang Wang, Hexiang Zhang, Zongwei Qiu, Tian Long, Saran Du, Jianjun Fan, Jiangli Sun, Wen Peng, Xiaojun Dalian Univ technol Frontiers Sci Ctr Smart Mat Oriented Chem Engn State Key Lab Fine Chem Dalian 116024 Peoples R China Dalian Univ technol Ningbo Inst Ningbo 315016 Peoples R China

The key factor in photothermal therapy lies in the selection of photothermal agents. Traditional photothermal agents generally have problems such as poor photothermal stability and low photothermal conversion efficiency. Herein, we have designed and synthesized an isoindigo (IID) dye. We used isoindigo as the molecular center and introduced common triphenylamine and methoxy groups as rotors. In order to improve the photothermal stability and tumor targeting ability, we encapsulated IID into nanoparticles. As a result, the nanoparticles exhibited high photothermal stability and photothermal conversion efficiency (67%) upon 635 nm laser irradiation. Thus, the nanoparticles demonstrated a significant inhibitory effect on live tumors in photothermal therapy guided by photoacoustic imaging and provided a viable strategy to overcome the treatment challenges. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.

关键词： Photothermal therapy Isoindigo Nanoparticles Photoacoustic imaging AGENTS DYE