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Journal of Materials Science & Technology 2022年第11期106卷 90-97页

作者： Ning Li Jingrui Han Kaili Yao Mei Han zumin wang Yongchang Liu Lihua Liu Hongyan Liang School of Materials Science and Engineering Tianjin UniversityTianjin 300350China Key Laboratory of Efficient Utilization of Low and Medium Grade Energy Ministry of EducationTianjin UniversityTianjin 300350China College of Innovation and Entrepreneurship Shanghai Jianqiao UniversityShanghai 201306China State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science and EngineeringTianjin UniversityTianjin 300354China

Exploring low-cost,high-performance,and stable electrocatalysts toward the oxygen evolution reaction(OER)is highly desired but remains *** metal hydroxide has been wildly utilized as a promising candidate,but practical implementation is impeded by insufficient catalytic activity,easy agglomeration,and poor ***,we report that both phosphorization and combination with MXnene can improve the catalysts’intrinsic activity and ***,MXene also prevents the agglomeration of the nanoparticles,resulting in the enhanced exposure of active *** char-acterizing and density functional theory simulations revealed that P species can attract electrons to pro-mote the formation of high-valence states of adjacent metal atoms,and coupling MXene support can effectively modulate the electronic structure and optimize the d-band center,which boosts the OER ***,the optimized NiFeCoP/Mxene catalyst exhibits a low overpotential of 240 mV at a current density of 10 mA cm^(−2),a small Tafel slope of 55 mV dec^(−1),and superior long-term stability of 40 h in 1 M KOH electrolyte,which is superior to other counterparts.

关键词： Transition metal phosphide Ti3C2Tx MXene Electrocatalyst Oxygen evolution

Anchoring nitrogen-doped Co_(2)P nanoflakes on NiCo_(2)O_(4)nanorod arrays over nickel foam as high-performance 3D electrode for alkaline hydrogen evolution

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Green Energy & Environment 2023年第2期8卷 470-477页

作者： Xiaohao Ji Xiaoyu Chen Lijuan Zhang Cheng Meng Yilei He Xing Zhang zumin wang Ranbo Yu Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing100083China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of Sciences1 North 2nd StreetZhongguancunHaidian DistrictBeijing100190China

Effective and robust electrocatalysts are mainly based on innovative materials and unique ***,we designed a flakelike cobalt phosphide-based catalyst supporting on NiCo_(2)O_(4)nanorods array,which in-situ grew on the nickel foam(NF)current collector,referring as NCo_(2)P/NiCo_(2)O_(4)/NF *** optimizing the microstructure and electronic structure through 3D hierarchy fabrication and nitrogen doping,the catalyst features with abundant electrochemical surface area,favorable surface wettability,excellent electron transport,as well as tailored d band ***,the as-prepared N-Co_(2)P/NiCo_(2)O_(4)/NF electrode exhibits an impressive HER activity with a low overpotentials of58 mV at 10 mA cm^(-2),a Tafel slop of 75 mV dec^(-1),as well as superior durability in alkaline *** work may provide a new pathway to effectively improve the hydrogen evolution performance of transition metal phosphides and to develop promising electrodes for practical electrocatalysis.

关键词： Hydrogen evolution reaction(HER) Cobalt phosphide Nonprecious electrocatalyst Hierarchal structure Nitrogen doping

Ultra-fine W-Y_(2)O_(3)composite powders prepared by an improved chemical co-precipitation method and its interface structure after spark plasma sintering

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Tungsten 2019年第3期1卷 220-228页

作者： Weiqiang Hu Qingshuang Ma Zongqing Ma Yuan Huang zumin wang Yongchang Liu Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjin 300072China

Y_(2)O_(3)-doped tungsten(W-Y_(2)O_(3))composite powders prepared by a traditional chemical co-precipitation method possess obvious bimodal distribution in size,which would deteriorate their sintering *** bimodal distribution can be effectively eliminated by an improved chemical co-precipitation method,in which the cationic surfactant cetyltrimethyl-ammonium bromide(CTAB)was innovatively *** reduced powders with excellent uniformity have an average grain size of only~31.5 *** is noteworthy that Y_(2)O_(3)particles would fuse and grow with the growth of W grains during subsequent spark plasma sintering(SPS)process,which was rarely reported in relevant literature *** top of that,phase interfaces of sintered W-Y_(2)O_(3)alloys were systematically *** to the intracrystalline oxygen content,the oxygen content at W/Y_(2)O_(3)phase boundaries is relatively *** can be found that the(110)crystal planes of W form coherent,semi-coherent,and non-coherent interfaces with different crystal planes of Y_(2)O_(3).The weak interfacial bonding strength between W and Y_(2)O_(3)phases results from relatively more oxygen impurities as well as more semi-coherent/non-coherent interfaces at phase boundaries compared with the inner W grains.

关键词： Y_(2)O_(3)-doped tungsten Chemical co-precipitation method CTAB SPS Phase boundary

Microstructure evolution and mechanical properties of linear friction welded S31042 heat-resistant steel

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Journal of Materials Science & Technology 2018年第4期34卷 653-659页

作者： Yanmo Li Yongchang Liu Chenxi Liu Chong Li Zongqing Ma Yuan Huang zumin wang Wenya Li State Key Lab. of Hydraulic Engineering Simulation and Safety School of Materials Science and Engineering Tianjin University School of Materials Science and Engineering Northwestern Polytechnical University

S31042 heat-resistant steel was joined by linear friction welding （LFW） in this study. The microstructure and the mechanical properties of the LFWed joint were investigated by optical microscopy, scanning electronic microscopy, transmission electron microscopy, hardness test and tensile test. A defect-free joint was achieved by using LFW under reasonable welding parameters. The dynamic recrystallization of austenitic grains and the dispersed precipitation of NbCrN particles resulting from the high stress and high temperature in welding, would lead to a improvement of mechanical property of the welded joint. With increasing the distance flom the weld zone to the parent metal, the austenitic grain size gradually increases from -1 μm to - 150 μm, and the microhardness decreases from 301 HV to 225 HV. The tensile strength （about 731 MPa） of the welded joint is comparable to that of the S31042 in the solution-treated state.

关键词： Austenitic steel Welding Microstructure Mechanical property Precipitation

计算机科学与技术专业人工智能平台课和微专业建设探索

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创新创业理论研究与实践 2024年第15期7卷 10-13页

作者：王颖洁张程烨白凤波汪祖民朱久祺大连大学信息工程学院广西民族大学人工智能学院

在智能时代的背景下，各行业对计算机科学与技术学科以及相关技术专业人才提出更高的要求。为了适应当前社会的快速发展，高校要结合智能时代的人才需求特点，加快对计算机科学与技术专业的创新与改革，从而提高人才培养的质量。该文结... 详细信息

在智能时代的背景下，各行业对计算机科学与技术学科以及相关技术专业人才提出更高的要求。为了适应当前社会的快速发展，高校要结合智能时代的人才需求特点，加快对计算机科学与技术专业的创新与改革，从而提高人才培养的质量。该文结合智能时代背景，就计算机科学与技术专业改革的理念和具体策略进行了探讨，通过对人才培养策略的优化，能够有效促进计算机专业人才综合素质和专业能力的提升，进而提升高校人才培养的质量，推动信息产业的发展。

关键词：教学改革 “互联网+” 微专业建设人才培养人工智能教育信息化

Effect of atomic structure on preferential oxidation of alloys:amorphous versus crystalline Cu-Zr

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Journal of Materials Science & Technology 2020年第5期40卷 128-134页

作者： Yifei Xu Lars P.H.Jeurgens Peter Schützendübe Shengli Zhu Yuan Huang Yongchang Liu zumin wang State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science and EngineeringTianjin UniversityTianjin 300350China Swiss Federal Laboratories for Materials Science and Technology Laboratory for Joining Technologies and CorrosionUeberlandstrasse 1298600 DuebendorfSwitzerland Max Planck Institute for Intelligent Systems Heisenbergstrasse 3D-70569 StuttgartGermany

The effect of structural order in the parent alloy substrate on the oxidation kinetics and oxide phase evolution was investigated for the thermal oxidation of amorphous Cu33at.%Zr67at.%and crystalline CuZr2 alloys of identical compositions in the temperature range of 200–250?*** was found that,besides the strong preferential oxidation of Zr in both alloys,the lack of structural order in the amorphous Cu33at.%Zr67at.%alloy results in much slower oxidation kinetics,as well as in distinctly different microstructures of the oxide overgrowth and its Zr-depletion zone in the wake of the ZrO2 overlayer growth *** experimental findings can be rationalized on the basis of the strikingly different atomic mobilities of Cu,Zr and dissolved O in the amorphous and crystalline alloys,which also results in different nucleation barriers for crystalline oxide *** thus obtained knowledge on the underlying oxidation mechanisms provides new and profound insights into the surface engineering of metallic alloys.

关键词： Oxidation Atomic structure Amorphous alloys Cu-Zr HRTEM

Nanostructured BiVO4 Derived from Bi-MOF for Enhanced Visible-light Photodegradation

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Chemical Research in Chinese Universities 2020年第1期36卷 120-126页

作者： CHEN Jianfei CHEN Xiaoyu ZHANG Xing YUAN Yao BI Ruyi YOU Feifei wang zumin YU Ranbo Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083P.R.China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China Key Laboratory of Advanced Material Processing&Mold Ministry of EducationZhengzhou UniversityZhengzhou 450002P.R.China

BiVO4,a promising visible-light responding photocatalyst,has aroused extensive research interest because of inexpensiveness and excellent chemical ***,its main drawback is the poor photoinduced charge-transfer *** nanostructures is an effective way to tackle this ***,we put forward a new method to prepare nanostructured BiVO4 from Bi-based metal-organic frameworks[Bi-MOF(CAU-17)]*** as-prepared material has a rod-like morphology inherited from the Bi-MOF sacrificial template and consists of small nanoparticle as building *** with its counterparts prepared by conventional methods,MOF-derived nanostructured BiVO4 shows better light absorption ability,narrower bandgap,and improved electrical conductivity as well as reduced ***,BiVO4 nanostructure demonstrates high photocatalytic activity under visible light towards the degradation of methylene *** blue can be degraded up to 90%within 30 min with a reaction rate constant of 0.058 ***,the cycling stability of the catalyst is excellent to withstand unchanged degradation efficiency for at least 5 cycles.

关键词： BiVO4 Nanostructure Metal-organic framework Ternary metal oxide Photocatalysis

High-strength diffusion bonding of oxide-dispersion-strengthened tungsten and CuCrZr alloy through surface nano-activation and Cu plating

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Journal of Materials Science & Technology 2021年第33期92卷 186-194页

作者： Yuanyuan Chen Yuan Huang Fei Li Lu Han Dongguang Liu Laima Luo Zongqing Ma Yongchang Liu zumin wang School of Materials Science and Engineering Tianjin UniversityTianjin 300350China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China

Oxide-dispersion-strengthened tungsten(ODS-W)and a Cu Cr Zr alloy were bonded by a three-step process:(i)surface nano-activation,(ii)copper plating followed by annealing,and(iii)diffusion *** morphological and structural evolutions of ODS-W and the interface of the ODS-W/CuCrZr joint during these processes have been thoroughly studied by X-ray diffraction,scanning electron microscopy,energy dispersive spectrometry,and high-resolution transmission electron *** surface nanoactivation,a nanoporous structure of ODS-W with an average pore size of~100 nm was obtained,and the Y_(2)O_(3)particles therein remained unchanged.A Cu coating was tightly bonded with the surface nanoactivated ODS-W after Cu plating and *** interaction layer embedded with nanosized W particles was formed at the interface between ODS-W and plated Cu after the three-step ***,well-cohesive ODS-W/Cu and ODS-W/Y_(2)O_(3)/Cu interfaces were *** ODS-W/Cu Cr Zr joint showed high shear strengths(up to 201 MPa)and effective bonded area ratios(>98%).The developed three-step bonding process between ODS-W and the Cu Cr Zr alloy provides an effective support for future plasma-facing components in nuclear fusion reactor applications.

关键词： Oxide-dispersion-strengthened W Surface nano-activation Cu plating CuCrZr Diffusion bonding Plasma-facing components

Stable confinement of Fe/Fe_(3)C in Fe,N-codoped carbon nanotube towards robust zinc-air batteries

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Chinese Chemical Letters 2021年第3期32卷 1121-1126页

作者： Lingbo Zong Xin Chen Shuming Dou Kaicai Fan zumin wang Wenjun Zhang Yunmei Du Jie Xu Xiaofei Jia Qi Zhang Xia Li Yida Deng Yanan Chen Lei wang Taishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and Technology Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life ScienceMOEState Key Laboratory of Eco-chemical EngineeringCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin 300072China Centre for Clean Environment and Energy School of Environment and ScienceGriffith UniversityQueensland 4222Australia Institute of Process Engineering Chinese Academy of SciencesBeijing 100190China

Catalytic oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)have garnered great attention as the key character in metal-air ***,we developed a superior nonprecious bifunctional oxygen electrocatalyst,fabricated through spatial confinement of Fe/Fe_(3)C nanocrystals in pyridinic N and Fe-Nx rich carbon nanotubes(Fe/Fe_(3)C-N-CNTs).During ORR,the resultant electrocatalyst exhibits positive onset pote ntial of 1.0 V(***),large half-wave potentials of 0.88 V(***),which is more positive than Pt/C(0.98 V and 0.83 V,respectively).Remarkably,Fe/Fe_(3)C-N-CNTs exhibits outstanding durability and great methanol tolerance,exceeding Pt/C and most reported nonprecious metal-based oxygen reduction ***,Fe/Fe_(3)C-N-CNTs show a markedly low potential at j=10 mA/cm^(2),small Tafel slopes and extremely high stability for ***,the Fe/Fe_(3)C-N-CNTs-based Zn-air batteries demonstrate high power density of 183 mW/cm^(2)and robust charge/discharge *** is revealed that the spatial confinement effect can impede the aggregation and corrosion of Fe/Fe_(3)C ***,Fe/Fe_(3)C and Fe-Nx play synergistic effect on boosting the ORR/OER activity,which provides an important guideline for construction of inexpensive nonprecious metal-carbon hybrid nanomaterials.

关键词： Patial confinement Nonprecious metal Bifunctional Oxygen electrocatalyst Synergistic effect Zn-air batterie

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基于伽马范数最小化的图像去噪算法

通信学报 2020年第10期41卷 222-230页

作者：王洪雁王拓潘勉汪祖民浙江理工大学信息学院浙江杭州310018 大连大学信息工程学院辽宁大连116622 五邑大学智能制造学部广东江门529020 杭州电子科技大学电子信息学院浙江杭州310018

针对核范数有偏近似秩函数导致基于核范数最小化的传统去噪方法去噪性能较差的问题,基于低秩理论,提出一种基于伽马范数最小化的图像去噪算法。首先对噪声图像重叠分块,然后基于结构相似性指数自适应搜索与当前图像块最相似的若干非局... 详细信息

针对核范数有偏近似秩函数导致基于核范数最小化的传统去噪方法去噪性能较差的问题,基于低秩理论,提出一种基于伽马范数最小化的图像去噪算法。首先对噪声图像重叠分块,然后基于结构相似性指数自适应搜索与当前图像块最相似的若干非局部图像块以组成相似图像块矩阵,进而利用非凸伽马范数无偏近似矩阵秩函数构建低秩去噪模型,最后基于奇异值分解对所得低秩去噪优化问题求解,并将去噪图像块重组为去噪图像。仿真结果表明,与现有主流PID、NLM、BM3D、NNM、WNNM、DnCNN和FFDNet算法相比,所提算法可较显著地消除高斯噪声,且可较好地恢复原始图像细节。

关键词：图像去噪低秩去噪模型非凸优化伽马范数结构相似性指数