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Self-healing of active site in Co(OH)_(2)/MXene electrocatalysts for hydrazine oxidation

Journal of materials Science & technology 2024年第36期203卷 108-117页

作者： Kun Xiang Yongjing Wang Zechao Zhuang Jing Zou Neng Li Dingsheng Wang Tianyou Zhai Jizhou Jiang School of Environmental Ecology and Biological Engineering School of Chemistry and Environmental EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationNovel Catalytic Materials of Hubei Engineering Research CenterWuhan Institute of TechnologyWuhan 430205China Department of Chemistry Tsinghua UniversityBeijing 100084China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The development of efficient hydrazine oxidation reaction(HzOR)catalysts is important for the construc-tion of remarkable energy storage and conversion ***,after a period of electrochemical reaction,the active site of the catalyst will be irreversibly reduced or inactivated,and how to recover the active site is a major ***,we report 2D Co(OH)_(2)/Ti_(3)C_(2)(OH)_(x)MXene composites with rapid re-construction and self-healing behaviors as efficient and stable electrocatalysts during HzOR *** experimental and theoretical results indicate that the introduction of Ti_(3)C_(2)(OH)_(x)MXene can effectively reduce the dehydrogenation barrier of Co(OH)_(2),from 0.584 eV to 0.481 eV to form the real catalytic active center Co(OH)***,Co(OH)O/Ti_(3)C_(2)(OH)_(x)MXene composites with metal-like conductiv-ity not only present spontaneous adsorption capacity of N_(2)H_(4),but also can modulated rate-determining step of dehydrogenation of∗N_(2)H_(4)to∗N_(2)H_(3)(0.54 eV)compared with Co(OH)***,the electrophilic oxygen of Co(OH)O/Ti_(3)C_(2)(OH)_(x)can spontaneously obtain electrons and protons from N_(2)H_(4),achieving the oxidation of N_(2)H_(4)while reducing Co(OH)O to Co(OH)_(2),thus completing the self-healing of the efficient catalyst.

关键词： Hydrazine oxidation Self-healing Reconstruction Co(OH)_(2)/MXene Electrocatalysis

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Low-temperature-field-assisted fabrication of cross-scale tissue engineering scaffolds

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International Journal of Extreme Manufacturing 2025年第2期7卷 388-416页

作者： Jing Ye Xingyu Zhou Zhuo Huang Xianglin Zhang Wei Huang Bin Wu Huamin Zhou State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

In tissue engineering(TE),tissue-inducing scaffolds are a promising solution for organ and tissue repair owing to their ability to attract stem cells in vivo,thereby inducing endogenous tissue regeneration through topological *** ideal TE scaffold should possess biomimetic cross-scale structures,similar to that of natural extracellular matrices,at the nano-to macro-scale *** freeform fabrication of TE scaffolds can be achieved through 3D printing,this method is limited in simultaneously building multiscale *** address this challenge,low-temperature fields were adopted in the traditional fabrication processes,such as casting and 3D *** crystals grow during scaffold fabrication and act as a template to control the nano-and *** microstructures can be optimized by adjusting various parameters,such as the direction and magnitude of the low-temperature *** preserving the macro-features fabricated using traditional methods,additional micro-structures with smaller scales can be incorporated simultaneously,realizing cross-scale structures that provide a better mimic of natural organs and *** this paper,we present a state-of-the-art review of three low-temperature-field-assisted fabrication methods—freeze casting,cryogenic3D printing,and freeze *** working principles,fabrication setups,processes,and examples of biomedical applications are *** challenges and outlook for low-temperature-assisted fabrication are also discussed.

关键词： low temperature assisted fabrication cross-scale structure tissue engineering scaffold freeze casting cryogenic 3D printing

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Recent research progress in the mechanism and suppression of fusion welding-induced liquation cracking of nickel based superalloys

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International Journal of Minerals,Metallurgy and materials 2024年第5期31卷 1072-1088页

作者： Zongli Yi Jiguo Shan Yue Zhao Zhenlin Zhang Aiping Wu Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China College of Engineering China Agricultural UniversityBeijing 100091China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084China School of Material Science and Engineering Southwest Jiaotong UniversityChengdu 610031China

Nickel-based superalloys are extensively used in the crucial hot-section components of industrial gas turbines,aeronautics,and astronautics because of their excellent mechanical properties and corrosion resistance at high *** welding serves as an effective means for joining and repairing these alloys;however,fusion welding-induced liquation cracking has been a challenging *** paper comprehensively reviewed recent liquation cracking,discussing the formation mechanisms,cracking criteria,and *** recent investigations,regulating material composition,changing the preweld heat treatment of the base metal,optimizing the welding process parameters,and applying auxiliary control methods are effective strategies for mitigating *** promote the application of nickel-based superalloys,further research on the combination impact of multiple elements on cracking prevention and specific quantitative criteria for liquation cracking is necessary.

关键词： nickel-based superalloy fusion welding liquation cracking cracking mechanism cracking suppression

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Finite element simulation of real cavity closure in cast Ti6Al4V alloy during hot isostatic pressing

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China Foundry 2022年第1期19卷 55-62页

作者： Qian Xu Wen Li Ya-jun Yin Jian-xin Zhou Hai Nan State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and TechnologyWuhan 430074China AECC Beijing Institute of Aeronautical Materials Beijing 100095China

The healing behavior of shrinkage cavity inside the cast Ti6Al4V alloy during hot isostatic pressing(HIP)was investigated experimentally by interrupted hot isostatic pressing *** X-ray micro computed tomography was used to record the morphology changes before and after hot isostatic *** two-dimensional geometry obtained by the microCT scan was used in simulation to study the evolution of the real shrinkage cavity during hot isostatic *** cavities,shrinkage porosity and small gas pores can be effectively eliminated under proper HIP *** two-dimensional morphology in the simulation results agrees well with the experimental *** study reveals that plastic deformation,creep and diffusion are the main mechanisms of cavity closure during hot isostatic *** addition,the simplified elliptical pores with aspect ratios at different positions were used to replace the real pores to further study the factors affecting the position of dimples after HIP by *** is found that the position of the dimples mainly depends on the aspect ratio of the elliptical pore and the distance between the pore surface and the external surface of the geometric model.

关键词： cast Ti6Al4V alloy hot isostatic pressing shrinkage cavity simulation closure behavior

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Effectiveness Evaluation Study of Self-made Zinc Alloy Sacrificial Anode under Chloride Salt Erosion Environment

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Journal of Wuhan University of technology(materials Science) 2023年第1期38卷 222-230页

作者：南雪丽 JI Jianrui LI Rongyang CHEN Hao WANG Yi TANG Weibin School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China Gansu Province Transportation Planning Survey&Design Institute Co.Ltd.Lanzhou 730000China

To investigate the effectiveness of self-made zinc alloy sacrificial anode material for the protection of reinforcement in concrete under chlorine salt erosion environment,salt solution immersion corrosion and electromigration accelerated corrosion tests were used to evaluate the effectiveness of self-made zinc alloy anode with the help of relevant cathodic protection guidelines and evaluation criteria for the corrosion of reinforcement in *** results showed that the protection was effective because the potential of the zinc alloy anode protection steel bar in the salt solution satis?ed the“-780 mV(SCE)”validity *** self-corrosion potential(E_(corr))of the sacri?cial anode protection steel in concrete was greater than-276 mV,and the protective current density of the zinc alloy anode was 1-3μA·cm^(-2),which met the standards of EN12696-2000,further indicating that the self-made zinc alloy sacri?cial anode had a good protection combining with the polarization resistance and the appearance of the corroded surface of the steel in *** microscopic morphology of the corroded surface and the composition of the corrosion products indicates that the mortar of the self-made zinc alloy anode has a lower pH than the imported anodes,so the long-term protection of the selfmade zinc alloy sacri?cial anode needs to be further improved.

关键词： zinc alloy anode cathodic protection steel corrosion concrete polarization curve

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Bioinspired cellulose-integrated MXene-based hydrogels for multifunctional sensing and electromagnetic interference shielding

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Interdisciplinary materials 2022年第4期1卷 495-506页

作者： Jingjiang Wei Chenglong Zhu Zhihui Zeng Fei Pan Fuqiang Wan Liwen Lei Gustav Nyström Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanHubeiPR China Laboratory for Cellulose and Wood Materials Swiss Federal Laboratories for Materials Science and Technology(Empa)DübendorfSwitzerland Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials School of Material Science and EngineeringShandong UniversityJinanShandongPR China Laboratory for Biointerfaces Swiss Federal Laboratories for Materials Science and Technology(Empa)St.GallenSwitzerland Department of Health Science and Technology ETH ZürichZürichSwitzerland

Bioinspired hydrogels are complex materials with distinctive properties comparable to biological *** exceptional sensitivity to various external stimuli leads to substantial application potential in wearable smart ***,these multifaceted hydrogels are often challenging to be combined with pattern customization,stimulus responsiveness,self-healing,and ***,inspired by mussel secretions,a printable,self-healing,and biocompatible MXene-based composite hydrogel was designed and prepared by incorporating Ti3C2Tx MXene nanosheets into the hydrogel framework through the chelation of calcium ions(Ca2+)with polyacrylic acid and cellulose nanofibers at alkaline *** biocompatible conductive hydrogel exhibited sensitivity(gauge factor of 2.16),self-healing(within 1 s),recognition,and adhesion,distinguishing it as an ideal candidate for wearable multifunctional sensors toward strain sensing,vocal sensing,signature detection,and Morse code ***,the multifunctional hydrogel manifested efficient electromagnetic interference shielding properties(reaching more than 30 dB at a thickness of 2.0 mm),protecting electronics and humans from electromagnetic radiation and ***,the presented work represents a versatile strategy for developing environmentally friendly conductive hydrogels,demonstrating the perspectives of intelligent hydrogels for multifunctional applications.

关键词： cellulose nanofiber electromagnetic interference shielding hydrogel MXene sensor

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Novel experimental strategy towards temperature inhomogeneity during spark plasma sintering of metallic glasses

Advanced Powder Materials

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advanced Powder materials 2023年第3期2卷 1-10页

作者： Huaping Ding Xiaoqian Bao Mao Zhang Junsong Jin Lei Deng Kefu Yao Atefeh Solouk Pan Gong Xinyun Wang State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing30 Xue Yuan RoadBeijing 100083China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Biomedical Engineering Department Amirkabir University of Technology(Tehran Polytechnic)TehranIran

Despite the importance of temperature distribution in spark plasma sintering of metallic glasses,its quantiﬁcation has been experimentally *** work proposes an experimental strategy to determine the sintering temperature by establishing a quantitative relationship between the temperature-thermal *** reproduced the thermal proﬁles of spark plasma sintering by isothermal annealing and found a correlation between annealing temperature and isothermal crystallization *** strong correlation indicates the temperature-dependent structural evolution of glassy *** isothermal crystallization time as the measuring gauge,we correlated the annealing temperature to the sintering temperature and obtained the sample temperature *** sample temperature is at least 19C higher than the nominal temperature of 425C measured by the ***,the sample temperature shows a hump-shaped pattern closely correlated with the current *** maximum temperature of 453C occurs on the sample/punches contact *** heterogeneity within the sample induces diverse microstructures and porous *** elucidate that the temperature inhomogeneity is intrinsic,given the presence of contact *** resistances affect the current distribution and heat transfer,resulting in a larger temperature gradient than the traditional powder metallurgy process.

关键词： Metallic glass Spark plasma sintering Temperature inhomogeneity Isothermal crystallization time Current distribution

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Deformability,inherent mechanical properties and chemical bonding of Al11Nd3 in Al-Nd target material

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材料科学技术（英文版） 2025年第11期214卷 278-291页

作者： Xue-Qian Wang Run-Xin Song Dong Wang Xu Guan Shuan Li Shuchen Sun Hongbo Yang Xiangjie Wang Daogao Wu Ganfeng Tu Song Li Hai-Le Yan Liang Zuo Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China College of Mechanical Engineering Zhijiang College of Zhejiang University of TechnologyShaoxing 312030China National Engineering Research Center for Rare Earth GRIREM Advanced Materials Co.Ltd.Beijing 100088China School of Metallurgy Northeastern UniversityShenyang 110819China Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

Microstructure uniformity of the Al-Nd target materials with Al11Nd3 significantly affects the performance of the fabricated Al-Nd film,which is widely used as wiring material in large-size thin-film transistor liquid crystal display(TFT-LCD)*** the inherent mechanical properties and chemical bonds of Al11Nd3 is crucial for homogenizing the Al-Nd ***,by a combined experimental and ab-initio theoretical study,the microstructure and deformability of the Al-3wt％Nd alloy and the inherent mechanical properties and chemical bonds of Al11Nd3 were investigated *** Al-3wt％Nd alloy is composed of the pre-eutectic α-Al matrix and the eutectic α-Al and a high stable α-Al11Nd3 *** the plastic deformation,the eutectic microstructure transforms from a cellular to a lamel-lar shape,while the morphology and dimension of α-Al11Nd3 are not changed *** examin-ing ideal tensile strength,elastic moduli,hardness and brittleness-ductility,the hardness-brittleness ofα-Al11Nd3 is quantitatively evaluated,accounting for its difficulties of plastic deformation and *** band structure,population analysis,topological analysis and crystal orbital Hamilton population,we found that α-Al11Nd3 possesses two types of chemical bonds:the Nd-Al and Al-Al *** former is a typical ionic bond with electron transfer from Nd to Al,while the latter,dominated by both 3s-3p and 3p-3p interactions,is a weak covalent *** mixed chemical bond is responsible for the high hardness-brittleness of α-*** work is expected to lay a foundation for Al-Nd alloy and catalyze the fabrication of high-quality Al-Nd target materials.

关键词： TFT-LCD Al-Nd Al11Nd3 Target material First-principles calculation

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Low Temperature Tetragonal Tungsten Bronze Oxides for Li-ion Storage

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Chemical Research in Chinese Universities 2024年第5期40卷 922-926页

作者： XU Chengxin ZHANG Wenda LOU Chenjie LI Chengyu XU Ligang SHI Yongchao LIU Jie LUO Huajie FU Jipeng KUANG Xiaojun TANG Mingxue Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials College of Chemistry and BioengineeringGuilin University of TechnologyGuilin541006P.R.China Center for High Pressure Science and Technology Advanced Research Beijing100193P.R.China Guangxi Key Laboratory of Optic and Electronic Materials and Devices Key Laboratory of New Processing Technology for Nonferrous Metals and MaterialsMinistry of EducationCollege of Materials Science and EngineeringGuilin University of TechnologyGuilin541004P.R.China School of Materials Science and Engineering&Key Laboratory of Advanced Materials and Devices for Post-Moore Chips Ministry of EducationUniversity of Science and Technology BeijingBeijing100083P.R.China Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province Institute of Optoelectronic Materials and DevicesChina Jiliang UniversityHangzhou310018P.R.China

Nb-based tungsten bronze oxides have emerged as attractive materials in various fields,owing to the structural openings and simple synthesis *** this work,the tetragonal tungsten bronze(TTB)NaWNbO_(6) was prepared by solid state reaction at a relatively low temperature of 775°*** local structure was systematically studied by solid state nuclear magnetic resonance(SSNMR)with the aid of transition electronic microscopy(TEM).The analysis indicates that NaWNbO6 has pentagonal,square,and triangular ***,square tunnels were partly occupied(50%)by Na,which creates the ability for the Li-ion storage with a volumetric capacity of 210 A·h·L^(−1)at 0.2 *** 2D ^(23)Na-^(23)Na EXSY results further suggest the ability of ions to fast exchange between the tetragonal and pentagonal tunnels,resulting in a high-rate performance 20 C.

关键词： Tetragonal tungsten bronze Solid-state^(23)Na NMR ^(93)Nb NMR spectrum Fast ion exchange

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Electrochemical Corrosion Behavior and Mechanical Response of Selective Laser Melted Porous Metallic Biomaterials

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Acta Metallurgica Sinica(English Letters) 2023年第8期36卷 1235-1246页

作者： Kai Hu Lei Zhang Yuanjie Zhang Bo Song Shifeng Wen Qi Liu Yusheng Shi State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Department of Mechanical Engineering City University of Hong KongTat Chee AvenueKowloonHong KongChina AVIC Manufacturing Technology Institute Science and Technology on Power Beam Processes LaboratoryBeijing Key Laboratory of High Power Beam Additive Manufacturing Technology and EquipmentAeronautical Key Laboratory for Additive Manufacturing TechnologiesBeijing100024China

The porous metallic biomaterials have attracted significant attention for implants because their lower young's modulus matches the human bones, which can eliminate the stress shielding effect and facilitate the growth of bone tissue cells. The porous metallic biomaterials fabricated by selective laser melting (SLM) have broad prospects, but the surface of the SLM-built porous structure has been severely adhered with unmelted powders, which affects the forming accuracy and surface quality. The porous metallic biomaterials face the corrosion problem of complex body fluid environments during service, so their corrosion resistance in the human body is extremely important. The surface quality will affect the corrosion resistance of the porous metallic biomaterials. Therefore, it is necessary to study the effect of post-treatment on the corrosion resistance of SLMed samples. In this work, the mechanical response and the electrochemical corrosion behavior in simulated body fluid of diamond and pentamode metamaterials Ti-6Al-4V alloy fabricated by SLM before and after sandblasting were studied. After sandblasting, the mechanical properties of the two porous metallic biomaterials were slightly improved, and the self-corrosion potential and pitting potential were more negative;meanwhile, the self-corrosion current density and passive current density increased, indicating that its corrosion performance decreased, and the passive film stability of sandblasted samples got worse.

关键词： Selective laser melting Porous metallic biomaterials Mechanical behavior Electrochemical corrosion behavior Ti-6A1-4V

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