检索结果-南通市图书馆

Rare Metals 2022年第7期41卷 2237-2242页

作者： Ying Yu Xuan-Li Wang Hong-Kun Zhang Zhi-Qin Cao Hao-Yang Wu Bao-Rui Jia Jun-Jun Yang Xuan-Hui Qu Ming-Li Qin Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Inner Mongolia Key Laboratory of Advanced Ceramics and Device School of Materials and MetallurgyInner Mongolia University of Science and TechnologyBaotou 014010China China United Test&Certification Co. LtdBeijing 101407China GRINM Group Corporation Limited Beijing 100088China College of Vanadium and Titanium Panzhihua UniversityPanzhihua 617000China Beijing Advanced Innovation Center of Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

Transition metal carbides(TMC)modified by mesoporous carbon nanosheets(MCNSs)with high activity,fast elec-tron/ion transfer and long durability are considered as promising electrocatalysts for hydrogen evolution react... 详细信息

关键词： carbide hydrogen carbides

Extraordinary toughening enhancement in nonstoichiometric vanadium carbide

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第2期97卷 176-181页

作者： Chong Peng Hu Tang Changjian Geng Pengjie Liang Biao Wan Yujiao Ke Yuefeng Wang Peng Jia Wenfeng Peng Lina Qiao Kenan Li Xiaohong Yuan Yucheng Zhao Mingzhi Wang State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Center for High Pressure Science and Technology Advanced Research Beijing 100190China Hebei Construction Material Vocational and Technical College Qinhuangdao 066004China State Key Laboratory of Superabrasives Zhengzhou Research Institute for Abrasives&Grinding Co.Ltd.Zhengzhou 450001China

1.Introduction Fracture toughness is the ability of materials against both the initiation and propagation of cracks[1],which is a crucial mechanical property for safety-critical applications of structural materials.Although the yield strength of ceramics is significantly higher than that of metallic materials,the fracture toughness is severely lower than that of metallic materials due to the strongly directional covalent bonding[1-3].For a long time,how to improve the fracture toughness of ceramics without the deterioration of strength(or hardness)has been one of the most challenging problems in materials science.

关键词： toughness carbide ceramics

原位界面工程构建二元过渡金属碳化物异质结构及其高效全解水性能研究

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2020年第8期65卷 640-650,M0004页

作者：张颂歌高国华朱罕蔡乐娟姜小迪陆双龙段芳东为富柴扬杜明亮 Key Laboratory of Synthetic and Biological Colloids(Mimstry of Education) School of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China Shanghai Key Laboratory o f Special Artificial Microstructure Materials and Technology Key Laboratory of Road and Traffic Engineering of the Ministry of EducationTongji UniversityShanghai 200092China Department of Applied Physics The Hong Kong Polytechnic UniversityHong Kong 999077China

调控催化剂表面的化学键来平衡表面水分子的吸附和分解对于碱性溶液中水分解至关重要.本研究提出一种通过原位界面工程来设计与合成表面具有丰富的Ni-W金属键的Ni2W4C-W3C Janus异质结构的简便策略.预先将金属离子均匀分散在纳米纤维中... 详细信息

调控催化剂表面的化学键来平衡表面水分子的吸附和分解对于碱性溶液中水分解至关重要.本研究提出一种通过原位界面工程来设计与合成表面具有丰富的Ni-W金属键的Ni2W4C-W3C Janus异质结构的简便策略.预先将金属离子均匀分散在纳米纤维中,在碳化过程中,以电纺纤维为反应器,金属盐首先被还原成Ni和W3C.在持续分解的过程中,Ni原子原位插入W3C晶体中形成新的Ni2W4C相,得到Ni2W4C-W3C Janus异质结构.这使得W3C中原本惰性的W原子成为Ni2W4C中的活性位点.Ni2W4C-W3C/碳纳米纤维可以直接作为电极材料,其在碱性电解液中析氢活性达到10 m A/cm^2的电流密度需要63 m V过电位,析氧活性达到30 m A/cm^2的电流密度需要270 m V的过电位.若同时用作阴极和阳极进行全解水性能研究,其电池电压分别需要1.55和1.87 V就达到10和100 m A/cm^2.密度泛函理论结果表明,Ni与W之间的强相互作用增强了W原子的局域电子态.Ni2W4C为H-OH键的裂解提供了活性位点,W3C促进了Hads中间体与H2分子的结合.原位电化学拉曼光谱的结果表明该材料对水分子和羟基具有很强的吸收能力,W原子是真正的反应活性位点.该方法为构建高效电解水催化材料提供了另一种思路.

关键词： Interfacial engineering Nickel tungsten carbide Janus structure Water splitting

Effects of cobalt carbide on Fischer–Tropsch synthesis with MnO supported Co-based catalysts

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第3期29卷 227-232页

作者： Fanfei Sun Ruoou Yang Zhaoming Xia Yuqi Yang Ziang Zhao Songqi Gu Dongshuang Wu Yunjie Ding Zheng Jiang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China Shanghai Synchrotron Radiation Facility Zhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China University of Chinese Academy of Sciences Beijing 100100China Center for Applied Chemical Research Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049ShaanxiChina Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Graduate school of science Kyoto UniversityKitashirakawaOiwake-choSakyo-kuKyoto-shiKyoto-fu606-8502Japan

Cobalt carbide(Co2C)was considered as potential catalysts available for large-scale industrialization of transforming syngas(H2 and CO)to clean fuels.Herein,we successfully synthesized Co-based catalysts with MnO supported,to comprehend the effects of Co2C for Fischer–Tropsch synthesis(FTS)under ambient conditions.The huge variety of product selectivity which was contained by different active sites(Co and Co2C)has been found.Furthermore,density functional theory(DFT)shows that Co2C is efficacious of CO adsorption,whereas is weaker for H adsorption than Co.Combining the advantages of Co and Co2C,the catalyst herein can not only obtain more C5+products but also suppress methane selectivity.It can be a commendable guide for the design of industrial application products in FTS.

关键词： Cobalt carbide Fischer–Tropsch synthesis X-ray absorption fine spectroscopy nanomaterials Density functional theory

A high specific Young's modulus steel reinforced by spheroidal kappa-carbide

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第28期87卷 54-59页

作者： P.Chen J.Fu X.Xu C.Lin J.C.Pang X.W.Li R.D.K.Misra G.D.Wang H.L.Yi Department of Materials Physics and Chemistry School of Materials Science and Engineeringand Key Laboratory for Anisotropy and Texture of MaterialsNortheastern UniversityShenyang 110819China The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Angang Steel Company Limited Technology Centre Anshan 114009China Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El Paso500 W.University AvenueEl PasoTX 79968USA

1.Introduction High strength steels continue to be developed for automotive applications to increase safety and reduce lightweight by downgauging[1,2].In addition,reducing density is another solution for the lightweight of automotive components[3,4].Aluminum addition could effectively reduce the density of steels,since it has a low atomic mass and invokes a lattice expansion[5].

关键词： carbide steel strength

carbide Evolution in High Molybdenum Nb-microalloyed H13 Steel during Annealing Process

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2015年第4期22卷 330-336页

作者： Tian-sheng LI Fu-ming WANG Chang-rong LI Guo-qing ZHANG Qing-yong MENG State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Mechanical Engineering Hunan Institute of Technology School of Materials Science and Engineering University of Science and Technology Beijing

Based on the Thermo-Calc thermodynamic software, the type of equilibrium precipitated carbides and their contents in high Mo Nb-microalloyed H13 steel （NMH13 steel） were calculated. The composition, morphology, and distribution of carbides after spheroidal annealing of two forged experimental steels were comparatively examined by means of optical microscopy （OM）, scanning electron microscopy （SEM）, electron dispersive spectroscopy （EDS） and transmission electron microscopy （TEM）. VC, M23 C6 and M6C are identified in H13 steel after spheroidizing annealing, while （V,Nb）C, M23C6 , M2C and M6C are observed in NMH13 steel. Moreover, it is found that the ad- dition of Nb significantly enhances the stability of MC phase and the high Mo content accelerates the precipitation of small rod-shape M2C phase in NMH13 steel. The amount of the fine carbides in NMH13 steel obviously increased with M2 C and M6 C precipitated from the ferrite phase, which is in accordance with the results of thermodynamic cal- culations.

关键词： niobium microalloying high molybdenum H13 steel spheroidizing annealing carbide

Integrated 64 pixel UV image sensor and readout in a silicon carbide CMOS technology

在线全文

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2022年第5期8卷 207-223页

作者： Joost Romijn Sten Vollebregt Luke M.Middelburg BrahimEl Mansouri Henk W.van Zeijl AlexanderMay Tobias Erlbacher Johan Leijtens Guoqi Zhang Pasqualina M.Sarro Laboratory of Electronic Components Technology and Materials(ECTM)Department of MicroelectronicsDelft University of TechnologyDelftThe Netherlands Fraunhofer Institute for Integrated Systems and Devices Technology IISB ErlangenGermany Lens R&D NoordwijkThe Netherlands

This work demonstrates the first on-chip UV optoelectronic integration in 4H-SiC CMOS,which includes an image sensor with 64 active pixels and a total of 1263 transistors on a 100mm^(2) chip.The reported image sensor offers serial digital,analog,and 2-bit ADC outputs and operates at 0.39 Hz with a maximum power consumption of 60μW,which are significant improvements over previous reports.UV optoelectronics have applications in flame detection,satellites,astronomy,UV photography,and healthcare.The complexity of this optoelectronic system paves the way for new applications such harsh environment microcontrollers.

关键词： optoelectronic image carbide

Enhanced hydrogen evolution reaction over molybdenum carbide nanoparticles confined inside single-walled carbon nanotubes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2019年第1期28卷 123-127页

作者： Tingting Cui Jinhu Dong Xiulian Pan Tie Yu Qiang Fu Xinhe Bao State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

Carbon nanotubes(CNTs) have shown as unique nanoreactors to tune the catalytic activity of confined nano-catalysts. Here we report that the catalytic performance of molybdenum carbide nanoparticles(MoC_x NPs) for the hydrogen evolution reaction(HER) process can be enhanced by encapsulation within single-walled carbon nanotubes(SWNTs) with a diameter of 1–2 nm. The catalyst with MoC_x NPs located on the interior surface of SWNTs(MoCx@SWNTs) exhibits a lower onset over-potential and a smaller Tafel slope than the one with MoC_x NPs attached on the exterior surface(MoCx/SWNTs). This is likely attributed to the much smaller particle size and the more reduced states of the confined MoC_x NPs, as well as the larger specific surface area of MoCx@SWNTs compared with Mo Cx/SWNTs. In addition, the electronic structure of the confined MoC_x NPs might be modified by the confinement effects of SWNTs, and hence the adsorption free energy of H atoms on the confined MoC_x NPs, which could also contribute to their higher performance. These results suggest that the SWNTs can be further explored for constructing novel catalysts with beneficial catalytic performance.

关键词： Single-walled carbon nanotubes Confined catalysis Molybdenum carbide Nanoparticles Hydrogen evolution reaction

Facile synthesis of molybdenum carbide nanoparticles in situ decorated on nitrogen-doped porous carbons for hydrogen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2019年第5期28卷 78-84页

作者： Jin-Tao Ren Yue-Jun Song Zhong-Yong Yuan National Institute for Advanced Materials School of Materials Science and EngineeringNankai UniversityTianjin 300350China Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)Nankai UniversityTianjin 300071China

Molybdenum-based electrocatalysts are promising candidates of platinum (Pt)-based materials in electrocatalyzing hydrogen evolution reaction (HER), due to their cost-efficient and resembled electronic properties. Reported herein is the preparation of molybdenum carbide nanoparticles uniformly decorated on nitrogen-modified carbons (Mo2C/NC) through the carbonization of Mo-based polymers under hydrogen atmosphere by using poly(p-phenylenediamine) and ammonium heptamolybdate polymer analogue as precursors. And the molybdenum nitride nanoparticles loaded on porous N-doped carbons (Mo2N/NC) are also fabricated by calcination the polymer precursors in nitrogen gas. The Mo2C/NC shows more excellent electrocatalytic activity than Mo2N/NC in 0.5 M H2SO4, together with robust long-term durability. The well-crystalline nanoparticles and the increased electron conductivity are the main characters responded for the high catalytic efficiency of the fabricated electrocatalysts. This easily fabrication procedure may provide a facile route to prepare non-noble metal carbide/nitride catalysts featuring wellengineered structural and textural peculiarities for realistic energy conversion system.

关键词： Molybdenum carbide Molybdenum nitride Nitrogen-doped carbon Hydrogen evolution reaction Electrocatalysis

Relationship between pore structure and hydration activity of CaO from carbide slag

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2019年第11期27卷 2771-2782页

作者： Junqiang Zhang Shu Zhang Mei Zhong ZhiWang Guoyu Qian Junhao Liu Xuzhong Gong Key Laboratory of Green Process and Engineering National Engineering Laboratory for Hydrometallurgical Cleaner Production TechnologyInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China Key Laboratory of Coal Clean Conversion&Chemical Engineering Process(Xinjiang Uyghur Autonomous Region) College of Chemistry and Chemical EngineeringXinjiang UniversityUrumqi 830046China University of Chinese Academy of Sciences Beijing 100190China

CaO needs to show high activity to be used as Ca-sorbent and slagging agent. Hydration activity is an important characteristic to evaluate the activity of CaO. In this study, carbide slag from polyvinyl chloride(PVC) industry was utilized as precursor for preparing high activity CaO. The roles of crystallite grain, average pore diameter(APD) and volume fraction of pore b 200 nm in diameter(VF200) in hydration activity of CaO from carbide slag(CS-CaO)were respectively investigated. The hydrolysis kinetics model of CaO shows a three-dimensional spherically symmetric diffusion model(D4), which suggests that hydration activity was mainly associated with APD and VF200 of CS-CaO with limited correlation to the crystal size. Specifically, the hydration activity of CS-CaO is increased with increasing VF200, while decreased with increasing APD. Under the invariable calcination temperature,the core–shell structure formed by the addition of graphite or Ca CO3 to CS effectively inhibits the sintering of CS-CaO and improves VF200. Consequently, the hydration activity of CS-CaO increased from 22.79 ℃·min^-1 to27.19 ℃·min^-1 and to 29.27 ℃·min^-1, with addition of 5% graphite or 5% CaCO3 into carbide slag, respectively.

关键词： carbide slag CaO Hydration activity Sintering Pore volume fraction