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arXiv 2022年

作者： Jin, Wen Zhang, Gaojie Wu, Hao Yang, Li Zhang, Wenfeng Chang, Haixin Center for Joining and Electronic Packaging State Key Laboratory of Material Processing and Die & Mold Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Shenzhen518000 China Institute for Quantum Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China

Spin-valve effect has been the focus of spintronics over the last decades due to its potential in many spintronic devices. Two-dimensional (2D) van der Waals (vdW) materials are highly expected to build the spin-valve heterojunction. However, the Curie temperatures (TC) of the vdW ferromagnetic 2D crystals are mostly below room temperature (∼30-220 K). It is very challenging to develop room temperature, ferromagnetic (FM) 2D crystals based spin-valve devices which are still not available to date. We report the first room temperature, FM 2D crystal based all-2D vdW Fe3GaTe2/MoS2/Fe3GaTe2spin valve devices. The Magnetoresistance (MR) of the all-devices is up to 15.89% at 2.3 K and 11.97% at 10 K, 4-30 times of MR from the spin valves of Fe3GeTe2/MoS2/Fe3GeTe2and conventional NiFe/MoS2/NiFe. Typical spin valve effect shows strong dependence on MoS2 spacer thickness in the vdW heterojunction. Importantly, the spin valve effect (0.31%) still robustly exists at 300 K with low working currents down to 10 nA (0.13 A/cm2). The results provide a general vdW platform to room temperature, 2D FM crystals based 2D spin valve devices. © 2022, CC BY-NC-SA.

关键词： Room temperature

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Submicron LaB_6 powders with high purity prepared in large scale by salt-assisted combustion synthesis

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Journal of Rare Earths 2018年第6期36卷 623-629页

作者： Zhengning Li Yujing Ou Peiqing La Yu Shi State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology

LaB6 powders were synthesized in large scale by salt-assisted combustion synthesis(CS) with different NaCl diluent contents. The variety of phases, particle size and purity of the powders were investigated using X-ray diffraction(XRD), scanning electron microscopy(SEM), energy dispersive spectrometer(EDS), and transmission electron microscope(TEM). With increase of NaCl content, the adiabatic combustion temperature of the reaction system linearly declines, the average particle size of leached products decreases, the impurity phases are easier to remove, and the products purity enhances obviously. When NaCl content is 40 wt%, the purity of the superfine powders of LaBis more than 98 wt%, and the average particle size is 380 nm.

关键词： Combustion synthesis LaB_6 powders Purity Particle size Rare earths

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Activating and Stabilizing a Reversible four Electron Redox Reaction of I−/I+for Aqueous Zn-Iodine Battery

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Angewandte Chemie 2024年第25期136卷

作者： Chenggang Wang Xiaoxing Ji Jianing Liang Shunshun Zhao Xixi Zhang Guangmeng Qu Wenfeng Shao Chuanlin Li Gang Zhao Prof. Xijin Xu Huiqiao Li School of Physics and Technology University of Jinan Jinan 250022 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology (HUST) Wuhan 430074 P. R. China State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Electrochemical Process and Technology of Materials Beijing University of Chemical Technology Beijing 100029 China School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China

Low capacity and poor cycle stability greatly inhibit the development of zinc-iodine batteries. Herein, a high-performance Zn-iodine battery has been reached by designing and optimizing both electrode and electrolyte. The Br − is introduced as the activator to trigger I + , and coupled with I + forming interhalogen to stabilize I + to achieve a four-electron reaction, which greatly promotes the capacity. And the Ni−Fe−I LDH nanoflowers serve as the confinement host to enable the reactions of I − /I + occurring in the layer due to the spacious and stable interlayer spacing of Ni−Fe−I LDH, which effectively suppresses the iodine-species shuttle ensuring high cycling stability. As a result, the electrochemical performance is greatly enhanced, especially in specific capacity (as high as 350 mAh g −1 at 1 A g −1 far higher than two-electron transfer Zn-iodine batteries) and cycling performance (94.6 % capacity retention after 10000 cycles). This strategy provides a new way to realize high capacity and long-term stability of Zn-iodine batteries.

关键词： four-electron redox interhalogen activation interlayer confinement effect zinc-iodine battery

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Microstructure and properties of high-fraction graphite nanoflakes/6061Al matrix composites fabricated via spark plasma sintering

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Transactions of Nonferrous Metals Society of China 2021年第6期31卷 1550-1560页

作者： Hao CHANG Jian SUN Guo-hong CHEN Bing WANG Lei YANG Jian-hua ZHANG Wen-ming TANG School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China Electric Power Research Institute State Grid Anhui Electric Power Co.Ltd.Hefei 230601China Anhui Province Key Laboratory of Microsystem Hefei 230088China Hefei Shengda Electronic Technology Industry Co. Ltd.Hefei 230088China Engineering Research Center of High Performance Copper Alloy Materials and Processing Ministry of EducationHefei 230009China

30-50 wt.%graphite nanoflakes(GNFs)/6061Al matrix composites were fabricated via spark plasma sintering(SPS)at 610℃.The effects of the sintering pressure and GNF content on the microstructure and properties of the composites were *** results indicated that interfacial reactions were inhibited during SPS because no Al4C3 was ***,the agglomeration of the GNFs increased,and the distribution orientation of the GNFs decreased with increasing the GNF *** relative density,bending strength,and coefficient of thermal expansion(CTE)of the composites decreased,while the thermal conductivity(TC)in the X−Y direction *** the sintering pressure increased,the GNFs deagglomerated and were distributed preferentially in the X−Y direction,which increased the relative density,bending strength and TC,and decreased the CTE of the *** 50wt.%GNFs/6061Al matrix composite sintered at 610℃ under 55 MPa demonstrated the best performance,i.e.,bending strength of 72 MPa,TC and CTE(RT−100℃)of 254 W/(m·K)and 8.5×10^(−6)K^(−1)in the X−Y direction,and 55 W/(m·K)and 9.7×10^(−6)K^(−1)in the Z direction,respectively.

关键词： electronic packaging composite spark plasma sintering(SPS) 6061Al alloy graphite nanoflake(GNF) microstructure thermal property mechanical property

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Three dimensional dendritic morphology and orientation transition induced by high static magnetic field in directionally solidified Al-10wt.%Zn alloy

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Journal of materials Science & technology 2019年第8期35卷 1587-1592页

作者： Sansan Shuai Xin Lin Yuanhao Dong Long Hou Hanlin Liao Jiang Wang Zhongming Ren State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringShanghai UniversityShanghai 200444 China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072 China Université de Technologie de Belfort-Montbéliard LERMPS Site de Sévenans90010 Belfort Cedex France

Effect of high static magnetic field on the dendritic morphology and growth direction in directionally solidified Al-10 wt.%Zn alloy were studied by three-dimensional(3D) X-ray micro-computed tomography, Electron Back-scattered Diffraction(EBSD) and X-ray Diffraction(XRD). The application of high static axial magnetic field(5T) during directional solidification was found to destabilize the solid/liquid interface and cause the growth direction of dendrite deviate from thermal gradient, leading to irregular solid/liquid interfacial shape and cellular to dendritic morphology transition. The thermoelectric magnetic convection(TEMC) caused by the interaction of thermoelectric effect and magnetic field was supposed to be responsible for the transition. In addition, the EBSD and XRD results confirm that the preferred growth direction of α-Al was found to transform from the traditionally expected <100> to<110>. The dendrite orientation transition(DOT) in Al-10 wt.%Zn alloy can be attributed to the effect of applied magnetic field on the anisotropy of crystal during solidification. The result indicates the potential application of high static magnetic field in altering the morphology and preferred growth direction of dendrite during directional solidification.

关键词： Al-Zn alloy High static magnetic field Three-dimensional dendrite morphology Dendrite orientation transition X-ray computed tomography

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Ultralow-threshold upconversion infrared vision via a microsphere-mediated directional photofield

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Nature communications 2025年第1期16卷 5064页

作者： Dong Wang Qikuan Cheng Weibang Xia Yongyao Tan Kexuan Yu Lu Zhang Guigang Li Rong Liu Wei Wang Linjuan Xu Suli Wu Yang Liu Yunming Wang Huamin Zhou State Key Laboratory of Material Processing and Die & Mould Technology Huazhong University of Science & Technology Wuhan China. Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan China. Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan China. guigangli@***. State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart Materials School of Chemical Engineering Dalian University of Technology Dalian China. State Key Laboratory of Material Processing and Die & Mould Technology Huazhong University of Science & Technology Wuhan China. wang653@***.

Constructing micro-/nanostructure-modulated photofields in upconversion devices to absorb low-energy photons and emit high-energy light is revolutionary for bioimaging, lasers, and photovoltaics, with proven capability to boost upconversion luminescence (UCL) by orders of magnitude. However, photoenergy dissipation and inadequate absorption result in excitation thresholds exceeding 1 mW/cm, which exceeds retinal safety limits and hinders wearable upconversion optics. Here, we report the use of upconversion core-shell microsphere-induced infrared field convergence, NaYF:Yb,Er shell-based resonant cavities for multiple reflection-absorption-upconversion and photonic crystal amplifiers to improve UCL intensity three orders of magnitude, and achieve ultralow threshold (0.0025 mW/cm). The 500 nm upconversion core-shell microspheres generated 1200-fold stronger electric field through concentrated photofield and attained 8-fold infrared absorption with a forward/backward emission ratio of 150. Fabricated upconversion contact lenses significantly improved dark-light imaging clarity and vision restoration in retinal degeneration rabbits. Microsphere-mediated directional upconversion strategy maximizes photoenergy utilization, paving the way for high-performance wearable upconversion devices.

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Innentitelbild: Activating and Stabilizing a Reversible four Electron Redox Reaction of I−/I+for Aqueous Zn-Iodine Battery (Angew. Chem. 25/2024)

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Angewandte Chemie 2024年第25期136卷

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Carbon Nanocage Supported Asymmetrically Coordinated Nickle Single-Atom for Enhanced CO2Electroreduction in Membrane Electrode Assembly

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Angewandte Chemie 2024年第2期137卷

作者： Yingxi Lin Chenfeng Xia Zhaozhao Zhu Junjie Wang Huiting Niu Shuning Gong Zhao Li Na Yang Prof. Jun Song Chen Dr. Rui Wu Bao Yu Xia School of Materials and Energy University of Electronic Science and Technology of China Chengdu 610054 China School of Chemistry and Chemical Engineering State Key Laboratory of Materials Processing and Die & Mould Technology Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education) Hubei Key Laboratory of Material Chemistry and Service Failure Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology (HUST) 1037 Luoyu Road Wuhan 430074 China Interdisciplinary Materials Research Center Institute for Advanced Study Chengdu University Chengdu 610106 China

Designing efficient catalysts for operating CO 2 electroreduction in membrane electrode assembly (MEA) faces significant obstacles. Herein, we propose an asymmetrically coordinated Ni single-atom catalyst featuring axial Br coordination at NiN 4 Br sites anchoring onto hollow Br/N co-doped carbon nanocages, achieved through a NaBr-assisted confined-pyrolysis strategy. The Ni-NBr-C catalyst exhibits a high CO Faradaic efficiency (FE CO >97 %) over the current density range of 50 to 350 mA cm −2 in the MEA device. Furthermore, Ni-NBr-C shows a stable cell voltage of 2.66±0.2 V while delivering a large current density of 350 mA cm −2 over an 85-hour long-term operation, demonstrating its potential for industrial-scale applications. advanced characterization techniques and theoretical calculations reveal that the coordination and doping of Br not only enhance the intrinsic activity but also highlight that the unique pore structure improves mass transfer efficiency.

关键词： CO2 electroreduction Membrane electrode assembly Carbon nanocages Single atom Asymmetrical coordination

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Microporous Hard Carbon Support Provokes Exceptional Performance of Single Atom Electrocatalysts for advanced Air Cathodes

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Angewandte Chemie 2025年

作者： Haijing Liu Ping Li Kaicai Fan Fenghong Lu Qi Sun Qi Zhang Bin Li Yajie Shu Lingbo Zong Lei Wang State Key Laboratory of Eco-chemical Engineering College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao 266042 China State Key Laboratory of Eco-chemical Engineering College of Environment and Safety Engineering Qingdao University of Science and Technology Qingdao 266042 China State Key Laboratory of Eco-chemical Engineering College of Materials Science and Engineering Qingdao University of Science and Technology Qingdao 266042 China National Local Joint Laboratory for Advanced Textile Processing and Clean Production Wuhan Textile University Wuhan 430200 China

Single atom catalysts embracing metal-nitrogen (MN x ) moieties show promising performance for oxygen reduction reaction (ORR). The modification on spatially confined microenvironments, which won copious attention with respect to achieving efficient catalysts, are auspicious but yet to be inspected for MN x moieties from modulating the energetics and kinetics of ORR. Here, Fe single atoms (SAs) are immobilized in microporous hard carbon (Fe-SAs/MPC), in which the microporous structure with crumpled graphene sheets serves confined microenvironment for catalysis. Fe-SAs/MPC holds a remarkable half-wave potential of 0.927 V and excellent stability for ORR. Theoretical studies unveil that hydrogen bonding between the intermediate of O* and micropore interior surfaces substantially promote its protonation and accelerate the overall ORR kinetics. Both the aqueous and quasi-solid-state zinc-air batteries driven by Fe-SAs/MPC air cathode show excellent stability with small charging/discharging voltage gaps. Importantly, when used as the air cathode for industrial chlor-alkali process, the applied voltage of Fe-SAs/MPC-based flow cell to reach 300 mA cm −2 is 1.57 V, which is 210 mV smaller than Pt/C-based one. These findings provide in-depth insights into the confined microenvironment of MN x moieties for boosted electrochemical performance, and pave the pathways for future catalyst development satisfying the requirement of industrial applications.

关键词： Chlor-alkali process Microporous hard carbon Oxygen reduction reaction Single atom Zn-air battery

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Inside Cover: Activating and Stabilizing a Reversible four Electron Redox Reaction of I−/I+for Aqueous Zn-Iodine Battery (Angew. Chem. Int. Ed. 25/2024)

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Angewandte Chemie International Edition 2024年第25期63卷

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