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Magnetic Conference - Short Papers (INTERMAG Short Papers), IEEE International

作者： Lin Liu Yuqing Li Jinjin Wang Lingqi Liu Mengying Bian Hongguo Zhang Ming Yue Key Laboratory of Advanced Functional Materials Ministry of Education of China College of Materials Science and Engineering Beijing University of Technology Beijing China

ISBN: (数字)9798350362213

ISBN: (纸本)9798350362220

In this work, to solve the problem of poor uniformity of the melt-spun (Nd, Pr)-Fe-B ribbons obtained by direct rapid quenching, appropriate short-time annealing had been implemented. The microstructure and magnetic properties of the melt-spun (Nd, Pr)-Fe-B ribbons before and after annealing showed a significant improvement in the uniformity. The improvement of uniformity was beneficial for the application of melt-spun powders in bonded magnets and hot-deformed magnets, enhancing the magnetic properties of related products.

关键词： Annealing Powders Microstructure Magnets Magnetic properties

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Surface hydrophobic modification enhanced catalytic performance of electrochemical nitrogen reduction reaction

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Nano Research 2022年第5期15卷 3886-3893页

作者： Lijuan Niu Ziwen Liu Guohua Liu Mengxuan Li Xupeng Zong Dandan Wang Li An Dan Qu Xiaoming Sun Xiayan Wang Zaicheng Sun Beijing Key Laboratory for Green Catalysis and Separation Center of Excellence for Environmental Safety and Biological EffectsFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China State Key Laboratory of Chemical Resource Engineering College of Energy Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal UniversityChangchun 130103China

Electrocatalytic nitrogen reduction reaction(NRR)is a sustainable approach for NH_(3)production with low energy ***,competing hydrogen reduction reaction(HER)in aqueous solution results in low NH_(3)production and Faraday efficiency(FE).Here,MoS_(2)nanostructures with a hydrophobic surface are synthesized by alkyl thiols *** and hydrophobic surface facilitates an efficient three-phase contact of N_(2),H_(2)O,and ***,localized concentrated N_(2)molecules can overcome the mass transfer limitation of N2 and depress the HER due to lowering the proton *** the active-sites decrease with the increase of the alkyl chain since the thiol may cover the active site,the optimized electrocatalyst achieves NH_(3)yield of 12.86×10^(-11)mol·cm^(-2)·s^(-1)at-0.25 V and 22.23%FE,which are 4.3 and 24 times higher than those of MoS2-CP electrocatalyst,*** increased catalytic performance is attributed to the high N_(2)adsorption and depressed HER.

关键词： nitrogen reduction reaction MoS_(2)electrocatalyst hydrophobic modification density functional theory calculations

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Ultrathin nanoporous metal electrodes facilitate high proton conduction for low-Pt PEMFCs

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Nano Research 2021年第8期14卷 2681-2688页

作者： Shuai Shi Xianglong Wen Qinqin Sang Shuai Yin Kaili Wang Jian Zhang Min Hu Huiming Yin Jia He Yi Ding Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials&Low-Carbon TechnologiesSchool oj Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China

Design of catalyst layers(CLs)with high proton conductivity in membrane electrode assemblies(MEAs)is an important issue for proton exchange membrane fuel cells(PEMFCs).Herein,an ultrathin catalyst layer was constructed based on Pt-decorated nanoporous gold(NPG-Pt)with sub-Debye-length thickness for proton *** the absence of ionomer incorporation in the CLs,these integrated carbon-free electrodes can deliver maximum mass-specific power density of 198.21 and 25.91 kW·gPt^(-1) when serving individually as the anode and cathode,at a Pt loading of 5.6 and 22.0 pg·cm^(-2),respectively,comparable to the best reported nano-catalysts for ***-depth quantitative experimental measurements and finite-element analyses indicate that improved proton conduction plays a critical role in activation,ohmic and mass transfer polarizations.

关键词： nanoporous metal electrode proton exchange membrane fuel cell(PEMFC) ultrathin catalyst layer proton conduction dealloying

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High-temperature thermal stability of C/C−ZrC−SiC composites via region labeling method

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Transactions of Nonferrous Metals Society of China 2022年第10期32卷 3349-3361页

作者： Zheng PENG Chun-mao MIAO Wei SUN Yong-long XU Hai-kun CHEN Yu-feng LIU Hong-bo ZHANG Xiang XIONG State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing TechnologyBeijing 100089China

To investigate the thermal stability of ceramic-matrix composites,three kinds of C/C−ZrC−SiC composites with different Zr/Si molar ratios were synthesized by reactive melt *** region labeling method,the high-temperature thermal stability of the composites was systematically studied by changing the temperature and holding time of thermal *** show that the mass loss rate of low Si composites has a growth trend with increasing temperature,and a crystal transformation from β-SiC toα-SiC occurs in the *** the calibrated area,SiC phase experiences Ostwald ripening and volume change with location migration,while ZrC phase experiences a re-sintering process with ***,it is found that increasing temperature has a more obvious effect on the thermal stability than extending holding time,which is mainly attributed to the faster diffusion rate of atoms.

关键词： thermal stability ceramic-matrix composites reactive melt infiltration high-temperature thermal treatment region labeling method

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MOF衍生的磷化钴纳米纤维用于电催化氧析出和氢析出反应

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science China Materials 2023年第8期66卷 3139-3145页

作者：邹联力魏永生王秋菊刘铮徐强 Susumu Kitagawa AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory(ChEM-OIL) National Institute of Advanced Industrial Science and Technology(AIST)Kyoto 606-8501Japan Innovative Functional Materials Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Aichi 463-8560Japan Institute for Integrated Cell-Material Sciences(WPI-iCeMS) Kyoto UniversityKyoto 606-8501Japan Institute for Advanced Materials School of Materials Science and EngineeringJiangsu UniversityZhenjiang 212013China Shenzhen Key Laboratory of Micro/Nano-Porous Functional Materials(SKLPM) SUSTech-Kyoto University Advanced Energy Materials Joint Innovation Laboratory(SKAEM-JIL)Department of Chemistry and Department of Materials Science and EngineeringSouthern University of Science and Technology(SUSTech)Shenzhen 518055China

高性能催化剂的开发和利用是能源领域的研究热点,其中制备具有高活性面积的一维纳米催化剂是目前的难点.本研究以金属有机框架(MOF)复合纤维为前驱体,通过热处理-磷化过程制备了具有氧析出(OER)和氢析出(HER)双功能特性的CoP纳米纤维.该... 详细信息

高性能催化剂的开发和利用是能源领域的研究热点,其中制备具有高活性面积的一维纳米催化剂是目前的难点.本研究以金属有机框架(MOF)复合纤维为前驱体,通过热处理-磷化过程制备了具有氧析出(OER)和氢析出(HER)双功能特性的CoP纳米纤维.该MOF衍生策略也可以用来制备其他一维纳米材料,如Co_(3)O_(4)纳米纤维、Co/C纤维和CoP/C复合纤维.研究表明,CoP纳米纤维的直径约100 nm,长度可达几微米,具有较高的活性面积.通过Cu掺杂改性可以提高CoP纳米纤维的催化活性,碱性条件下测得其对OER和HER的过电位分别为330和170 mV,可与商业的贵金属催化剂相媲美.该工作也为一维双功能电极催化剂的制备及功能化提供了研究基础.

关键词：金属有机框架贵金属催化剂磷化过程纳米纤维复合纤维电催化过电位一维纳米材料

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Thinner 2D α-MoO_(3) makes setting up memristors easier

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Journal of Materiomics 2024年第6期10卷 1279-1289页

作者： Yukun Hong Shangui Lan Baojun Pan Zhixiang Zhang Bingbing Chen Lijie Zhang Peijian Wang Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou325035ZhejiangChina Institute of New Materials&Industrial Technologies Wenzhou UniversityWenzhou 325024China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou311215China Macao Institute of Materials Science and Engineering(MIMSE) MUST-SUDA Joint Research Center for Advanced Functional MaterialsMacao University of Science and TechnologyTaipa999078MacaoChina Department of Energy Science and Engineering Nanjing Tech UniversityNanjing210009China

Two-dimensional(2D)metal oxide α-MoO_(3) shows great potentials because of its very high dielectric constant,air stability and anisotropic phonon ***,a method to produce ultrathin single crystallineα-MoO_(3) with high transferability for functional device architecture is ***,we report on the controllable synthesis of ultrathinα-MoO_(3) single crystals via chemical vapor deposition(CVD)assisted by plasma *** also carried out systematic computational work to explicate the mechanism for the slantly-oriented growth of thin nanosheets on plasma-pretreated *** method possesses certain universality to synthesize other ultrathin oxide materials,such as Bi_(2)O_(3) and Sb_(2)O_(3) ***-grownα-MoO_(3) presents a high dielectric constant(≈40),ultrathin thickness(≈3 nm)and high *** withα-MoO_(3) as the functional layers show excellent performance featuring high on/off ratio of approximately 104,much lower set voltage around 0.5 V,and highly repetitive voltage sweep *** power consumption of MoO_(3) memristors is significantly reduced,resulted from reduced thickness of the MoO_(3) *** crystal ultrathinα-MoO_(3) shows great potentials in post-Moore memristor and the synthesis of CVD assisted by plasma pretreatment approach points to a new route for materials growth.

关键词： Ultrathin molybdenum trioxide Thickness controlling High transferability Memristor Low power consumption

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A review of non-noble metal-based electrocatalysts for CO_(2)electroreduction

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Rare Metals 2021年第11期40卷 3019-3037页

作者： Jia-Jun Wang Xiao-Peng Li Bing-Feng Cui Zhao Zhang Xiao-Fei Hu Jia Ding Yi-Da Deng Xiao-Peng Han Wen-Bin Hu School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsKey Laboratory of Advanced Ceramics and Processing Technology(Ministry of Education)Tianjin UniversityTianjin 300072China Thayer School of Engineering Dartmouth CollegeHanover NH 03755USA Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China

The excessive emission of CO_(2) has caused many environmental issues and is severely threatening the ***_(2) electroreduction reaction(CO_(2) RR) that driven by sustainable power is an ideal route for realizing the net reduction of CO_(2) and carbon *** efficient electrocatalysts with low cost and high performance is critical for the wide applications of CO_(2) RR *** the various explored CO_(2) RR catalysts,non-noble metal(NNM)-based nanomaterials have drawn increasing attentions due to the remarkable performance and low *** this mini-review,the recent advances of NNM-based CO_(2) RR catalysts are summarized,and the catalysts are classified based on their corresponding reduction *** preparation strategies for engineering the electrocatalysts are introduced,and the relevant CO_(2) RR mechanisms are discussed in ***,the current challenges in CO_(2) RR research are presented,and some perspectives are proposed for the future development of CO_(2) RR *** mini-review introduces the recent advances and frontiers of NNM-based CO_(2) RR catalysts,which should shed light on the further exploration of efficient CO_(2) RR electrocatalysts.

关键词： CO_(2)electroreduction Non-noble metals Reaction mechanism Heterogeneous catalysis Structural-function relationship

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Mechanical design and energy absorption of 3D novel hybrid lattice metamaterials

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science China(Technological sciences) 2021年第10期64卷 2220-2228页

作者： ZHANG Peng Biligetu QI DeXing XUE Rui LIU Kai HUANG ZhiXin WU WenWang LI Ying State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures Institute of Advanced Structure TechnologyBeijing Institute of TechnologyBeijing 100081China Department of Engineering Mechanics School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Inner Mongolia First Machinery Group Co.Ltd. Baotou 014000China

In this paper,three-dimensional(3D)novel hybrid lattice structures with exceptional mechanical properties and energy absorbing performances were proposed,and experimental and finite element simulation comparisons were performed to demonstrate their potential in mechanical ***,different types of basic cubic unit cells were designed for constructing three types of novel hybrid metamaterials,in which stepped circulation of different unit cells was conceived to generate architected ***,quasi-static compression experiments and finite element simulations were performed to study the deformation process and failure mechanisms of as-fabricated hybrid *** energy absorption efficiency,specific energy absorption(SEA)indicators,and energy absorption capabilities of different hybrid lattice metamaterials were compared and *** results show that the deformation mechanisms of novel hybrid lattice were beneficial for generating remarkable elevated densification strain,and the energy absorption efficiency can be tailored by altering the types or sizes of basic unit ***-hardening and bilinear features were also obtained.

关键词： hybrid lattice quasi-static compression densification strain energy absorption strain hardening bilinear

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Colossal magnetoresistance and Fermi surface topology in the layered Zintl-phase compound YbAl2Si2

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Physical Review B 2024年第17期110卷 174408页

作者： Fang Tang Yang Chen Xunqing Yin Weiyao Zhao Lei Zhang Zhida Han Renkui Zheng Xiaoming Zhang Yong Fang Jiangsu Laboratory of Advanced Functional Materials School of Electronic and information Engineering Jiangsu Key Laboratory of Thin Films School of Physical Science and Technology School of Physics and Astronomy and Tsung-Dao Lee Institute Department of Materials Science and Engineering School of Materials Science and Engineering School of Physics and Materials Science

Considerable attention has been devoted to CaAl2Si2-type Zintl-phase compounds for their intriguing physical properties, particularly the complex interplay between band structures and magnetism. Herein we grow high-quality single crystals of nonmagnetic YbAl2Si2 and examine the physical properties, including resistivity, magnetoresistance, angular magnetoresistance, Hall resistivity, and band structures. This compound shows metallic properties and Fermi-liquid behaviors. Its resistivity under magnetic fields increases as per Kohler rule, with normalized magnetoresistance curves merging into one, ruling out potential metal-insulator-like transitions. Colossal magnetoresistance is observed at low temperatures. Hall resistivity analysis categorizes this compound as an uncompensated semimetal. Its angle dependence of the magnetoresistance and quantum oscillation frequencies demonstrate an anisotropy ratio of ∼1.26 for the Fermi surface. Theoretical calculations corroborate these findings, mapping Fermi surfaces with three hole pockets and an electron pocket. Considering both the experimental and theoretical results, the colossal and angle-dependent magnetoresistance may be ascribed to unequal carrier densities coupled with large differences in carrier mobilities and Fermi-surface anisotropy, respectively. These results imply YbAl2Si2 is a promising candidate to study the crucial effect of electronic properties on its charge transport.

关键词： Colossal magnetoresistance Fermi surface Magnetotransport Semimetals Single crystal materials Topological materials Density functional calculations Fermi liquid theory Resistivity measurements

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Multifunctional catalytic sites regulation of atomic-scale iridium on orthorhombic-CoSe_(2)for high efficiency dual-functional alkaline hydrogen evolution and organic degradation

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Journal of Energy Chemistry 2024年第5期92卷 271-281页

作者： Jingjing Huang Chenglin Zhong Yanjie Xia Jia Liu Guizhen Li Chao Yang Jiahong Wang Qian Wang Zhenbao Zhang Feng Yan Jianghua Wu Yu Deng Zhenjiang Zhou Xingchen He Paul K.Chu Woon-Ming Lau Xue-Feng Yu College of Chemistry and Chemical Engineering Linyi UniversityLinyi 276005ShandongChina Shenzhen Engineering Center for the Fabrication of Two-Dimensional Atomic Crystals Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093JiangsuChina College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058ZhejiangChina Department of Physics Department of Materials Science and EngineeringDepartment of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong KongChina

The earth-abundant and high-performance catalysts are crucial for commercial implementation of hydrogen evolution reaction(HER).Herein,a multifunctional site strategy to construct excellent HER catalysts by incorporating iridium(Ir)ions on the atomic scale into orthorhombic-CoSe2(Ir-CoSe_(2))was *** hydrogen evolution activity in alkaline media such as a low overpotential of 48.7 mV at a current density of 10 mA cm^(-2)and better performance than commercial Pt/C catalysts at high current densities were found in the Ir-CoSe_(2) *** the experiments and theoretical calculations,it was revealed that Ir enabled CoSe_(2)to form multifunctional sites to synergistically catalyze alkaline HER by promoting the adsorption and dissociation of H_(2)O(Ir sites)and optimizing the binding energy for H^(*)on Co *** was noticeable that the electrolytic system comprising the Ir-CoSe_(2)electrode not only produced hydrogen efficiently via HER,but also degraded organic pollutants(Methylene blue).The cell voltage of the dual-function electrolytic system was 1.58 V at the benchmark current density of 50 mA cm^(-2),which was significantly lower than the conventional water splitting *** was indicated that this method was a novel strategy for designing advanced HER electrocatalysts by constructing multifunctional catalytic sites for hydrogen production and organic degradation.

关键词： Orthorhombic-CoSe_(2) Multifunctional sites design Hydrogen evolution reaction Synergistically catalyze Methylene blue oxidation

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