检索结果-内蒙古大学图书馆

Fabrication of nanoporous Ni and NiO via a dealloying strategy for water oxidation catalysis

Journal of Energy Chemistry 2020年第11期29卷 125-134页

作者： Xiangrong Ren Yiyue Zhai Qi Zhou Junqing Yan Shengzhong Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050GansuChina Materials Science and Engineering College Lanzhou University of TechnologyLanzhou 730050GansuChina

Nickel oxides and(oxy)hydroxides are promising replacements for noble-metal-based catalysts owing to their high activity and good long-term stability for the oxygen evolution reaction(OER). Herein, we developed nanoporous Ni by a method of combined rapid solidification and chemical dealloying. Subsequently,nanoporous Ni O was obtained via heating treatment, the macropore and skeleton sizes of the NiO originated from Ni10Al90 alloy are 100–300 nm and 80–200 nm, respectively. Benefiting from the multi-stage nanoporous structure and high specific surface area, the nanoporous NiO demonstrates an outstanding OER, reaching 20 mA cm-2 at an overpotential of 356 mV in 1 M KOH. The corresponding Tafel slope and apparent activation energy are measured to be 76.73 mV dec-1 and 29.0 kJ mol-1, respectively. Moreover,kinetic analysis indicates that the Ni O catalyst shows pseudocapacitive characteristics, and the improved current is attributed to the high-rate pseudocapacitive behavior that efficiently maintains increased nickel redox cycling to accelerate the reaction rates. After 1000 cycles of voltammetry, the overpotential of the NiO decreases by 22 mV(j = 10 mA cm-2), exhibiting excellent stability and durability.

关键词： Rapid solidification Dealloying Nanoporous Ni Electrocatalyst OER

来源：评论

学校读者我要写书评

暂无评论

Microstructures and properties of SnZn-xEr lead-free solders

引用

Journal of Rare Earths 2012年第8期30卷 790-793页

作者：张亮崔俊华韩继光郭永环何成文 School of Mechanical&Electrical Engineering Jiangsu Normal University Provincial Key Laboratory of Advanced Welding Jiangsu University of Science and Technology Department of Basic Experiment Naval Aeronautical and Astronautical University

The Sn9Zn eutectic alloy is the nontoxic lead-free solders alternative having a melting temperature which is closest to that of the eutectic SnPb alloy. In order to improve the properties of SnZn lead-free solders, 0-0.5 wt.% of rare earth Er was added to the base alloys, and the microstructures were studied. Results showed that the addition of rare earth Er could enhance the wettability of SnZn solders, with 0.08%Er addition, the spreading area gavc an 19.1% increase. And based on the mechanical testing, it was found that the tensile force and shear force of SnZn-xEr solder joints could be improved significantly. Moreover, the oxidation resistance of SnZn0.08Er solder was better than that of SnZn solder, in addition, it was found that trace amounts of rare earth Er could refine the microstructures of SnZn solders, espe- cially for Zn-rich phases, and excessive amount of rare earth Er led to a coarse microstructure.

关键词： lead-free solders solder joints mechanical orooerties: oxidation resistance rare earths

来源：评论

学校读者我要写书评

暂无评论

Efficient Electrophotochemical Microreactor for Direct Green Production of Phenol from Benzene

引用

Industrial and engineering Chemistry Research 2025年

作者： Ding, Zhiming Wang, Danfeng Wang, Gang Du, Runjuan Fan, Chuanting Zhang, Yaheng Zhang, Jie Tang, Zhiyong Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201203 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing100049 China School of Chemistry and Material Science University of Science and Technology of China Anhui Hefei230026 China Key Laboratory of Functional Molecular Solids Ministry of Education Anhui Engineering Research Center of Carbon Neutrality College of Chemistry and Materials Science Anhui Normal University Wuhu241000 China Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano Materials College of Chemical and Materials Engineering Xuchang University Henan Xuchang461000 China

Electrophotocatalysis, a burgeoning and sustainable technique in the field of organic synthesis, faces challenges in practical implementation due to technological and equipment limitations. This work introduces the design and engineering of an electrophotocatalytic flow microreactor for efficient synthesis of phenol from benzene in one step. The study explored the effects of microreactor configuration and various parameters, such as applied voltage, light intensity, and the concentrations of oxidant DDQ and electrolyte TBABF4. The innovative microreactor, characterized by a compact electrode gap and an expansive optical window, achieved a high phenol yield of 21.2% within a short residence time of 10 min, a significant improvement over the 14.3% yield obtained by a batch reactor in 6 h. The microreactor delivered a remarkable phenol productivity of 116.8 mmol h-1 L-1, outperforming all previous electrophotocatalytic synthesis records. Furthermore, a techno-economic analysis demonstrated that small-scale electrophotocatalytic synthesis of phenol reduced the per-unit production cost, displaying economic advantages competitive with the traditional cumene method. This work provides valuable insights into the engineering of flow microreactors for electrophotocatalysis and offers guidance for the potential industrial-scale application of electrophotocatalytic flow reactions. © 2025 American Chemical Society.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Ageing Hardening Mechanism and Corrosion Resistance in the Fe65Cr13Cu3(CoMnMoNiAlTi)19 Medium-Entropy Stainless Alloy

引用

Acta Metallurgica Sinica(English Letters) 2021年第11期34卷 1601-1608页

作者： Ben-Qi Xu Hui Zhang Dong Ma Qun-Shuang Ma Li-Zhai Pei Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials(Ministry of Education) Anhui University of Technology243002Ma'anshanChina School of Materials Science and Engineering Anhui University of TechnologyMa'anshan 243002China

The ageing hardening mechanism of a newly designed Fe65Cr13Cu3(CoMnMoNiAlTi)19 medium-entropy stainless alloy(ME-SA)with a simple bcc solid solution matrix was *** kind of ME-SA possessed a higher ageing hardness of approximately 584 HV and higher compressive stress and corrosion resistance than those of the conventional precipitation hardening stainless steel 17-4 PH(Cr17Ni4Cu4 Nb),which has comparable compressive *** well-dispersed B2-ordered phase in the cast state transformed to a D03 crystal structure with a higher ordering degree and reduced the precipitate size after ageing at 500℃,thus promoting a great ageing hardening effect.

关键词： Medium-entropy stainless alloy Ordered phase transition Aging hardening Corrosion resistance

来源：评论

学校读者我要写书评

暂无评论

Self-corrosion, electrochemical and discharge behavior of commercial purity Al anode via Mn modification in Al-air battery

引用

Rare Metals 2021年第12期40卷 3501-3511页

作者： Guo-Sheng Peng Jun Huang Yi-Cheng Gu Guang-Sheng Song School of Materials Science and Engineering Anhui University of TechnologyMa’anshan 243002China Key Laboratory of Green Manufacturing and Surface Technology of Advanced Metal Materials Ministry of EducationAnhui University of TechnologyMa'anshan 243002China

The self-corrosion, electrochemical and discharge behavior of commercial purity Al anode via Mn modification in Al-air battery was studied by the hydrogen evolution, weight loss, electrical conductivity, electrochemical and discharge tests. Results show that the synergetic effects of the dissolved Mn and Mn-modifying Al_(3)Fe intermetallic decrease the weight loss and inhibit the hydrogen evolution of commercial purity Al in Na OH solution when minor Mn is introduced. However, more Mn addition leads to the formation of Al_6Mn intermetallic,which has little effect on the weight loss, but accelerates the hydrogen evolution. Mn introduction plays a positive role in activating Al anodes, resulting in a decrease in the anodic polarization and an increase in the discharge voltage. Among all the commercial purity Al-x Mn anodes, 0.1 wt% Mn addition exhibits the best discharge efficiency for Al-air battery.

关键词： Commercial purity Al Mn addition Corrosion Electrochemical activity Discharge behavior

来源：评论

学校读者我要写书评

暂无评论

Transition metal phosphides:A wonder catalyst for electrocatalytic hydrogen production

引用

Chinese Chemical Letters 2023年第9期34卷 25-33页

作者： Mingxuan Du Deng Li Shengzhong(Frank)Liu Junqing Yan Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119China

Hydrogen evolution from water electrolysis has become an important reaction for the green energy *** precious metals and their compounds are excellent catalysts for producing hydrogen;however,their high cost limits their large-scale practical ***,the development of affordable electrocatalysts to replace these precious metals is *** metal phosphides(TMPs)have shown remarkable performance for hydrogen evolution and garnered considerable interest in the field of *** on the detailed introduction of TMPs in previous studies,we have systematically summarized the preparation methods,improvement methods,and development opportunities of TMPs and proposed“stimulatory factors”as a fundamental factor affecting the performance of TMPs *** the core of this research,“stimulatory factors”can provide numerous solutions to improve the performance of TMP materials and provide a good starting point for TMP research.

关键词： Hydrogen evolution reaction Phosphating Doping Morphology Heterojunction Defects

来源：评论

学校读者我要写书评

暂无评论

Dynamic boron-carbamate bonds cross-link polyurea elastomers with enhanced impact-resistant properties

引用

Progress in Organic Coatings 2025年 207卷

作者： Sibo Wang Rongrong Chen Peili Liu Jing Yu Qi Liu Jingyuan Liu Jiahui Zhu Jun Wang Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China Yangtze Delta Region Advanced Research Institute of Harbin Engineering University Nantong 226000 China

Polyurea is widely used in infrastructure protection because of its significant mechanical properties, excellent toughness, and rapid curing performance. However, developing a high-strength polyurea with a rapid impact response remains challenging. Here, dynamic boron-carbamate bonds are integrated with polyurea elastomers (B x PU) by cross-linking a mixture of diisocyanate and aniline-terminated polyether with boric acid to achieve enhanced mechanical strength and toughness. Polyurea elastomer (B 3 PU) exhibits superior mechanical performance, attributed to the synergistic effect of reversible boron-carbamate bonds and hydrogen bonds, with an ultimate strength of 53.8 MPa, a tensile strain of 738.8 %, and a toughness of 240.9 ± 26.4 MJ m −3 . Additionally, the experimental and simulation results demonstrate that the B x PU elastomers exhibit fast responsiveness, excellent impact resistance, and protective performance. Collectively, this study highlights a facile method for developing high-strength polyurea elastomers with enhanced impact resistance, providing a new choice for explosion protection and building longevity.

关键词：

来源：评论

学校读者我要写书评

暂无评论

An interface shear damage model of chromium coating/steel substrate under thermal erosion load

引用

Defence technology（防务技术） 2021年第2期17卷 405-415页

作者： Xiao-long Li Yong Zang Yong Lian Min-yu Ma Lei Mu Qin Qin School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing100083China Beijing Key Laboratory for Corrosion Erosion and Surface TechnologyBeijing100083China

The Cr-plated coating inside a gun barrel can effectively improve the barrel’s erosion resistance and thus increase the service ***,due to the cyclic thermal load caused by high-temperature gunpowder,micro-element damage tends to occur within the Cr coating/steel substrate interface,leading to a gradual deterioration in macro-mechanical properties for the material in the related *** order to mimic this cyclic thermal load and,thereby,study the thermal erosion behavior of the Cr coating on the barrel’s inner wall,a laser emitter is utilized in the current *** the help of in-situ tensile test and finite element simulation results,a shear stress distribution law of the Cr coating/steel substrate and a change law of the interface ultimate shear strength are *** have shown that the Cr coating/steel substrate interface’s ultimate shear strength has a significant weakening effect due to increasing *** this study,the interfacial ultimate shear strength decreases from 2.57 GPa(no erosion)to 1.02 GPa(laser power is 160 W).The data from this experiment is employed to establish a Cr coating/steel substrate interface shear damage *** this model is used to predict the flaking process of Cr coating by finite element *** simulation results show that the increase of coating crack spacing and coating thickness will increase the service life of gun barrel.

关键词： Cr coating/steel substrate Thermal erosion Finite element simulation Ultimate shear strength Interface shear damage model

来源：评论

学校读者我要写书评

暂无评论

Effect of initial orientation on microstructure and mechanical properties of AZ31 Mg alloy sheets via accumulated extrusion bonding

引用

Progress in Natural Science:Materials International 2023年第2期33卷 178-184页

作者： Xia Cao Tingzhuang Han Ji Xu Guangsheng Huang Hua Zhang Jianhui Bai Fusheng Pan Department of Mechanics and Surface Engineering Changzhou Institute of Technology Department of Aviation Manufacturing Engineering Changzhou Institute of Technology State Key Laboratory of Solidification Processing School of Materials Science & Engineering Northwestern Polytechnical University State Key Laboratory of Mechanical Transmission College of Materials Science and Engineering Chongqing University Institute for Advanced Studies in Precision Materials Yantai University

In this study, effects of initial orientation on microstructure evolution and mechanical properties of AZ31 Mg alloy sheets via accumulated extrusion bonding(AEB) was systematically studied. The samples with RD and TD parallel to extrusion direction(ED) were labeled as RED and TED, respectively. RD and TD pieces alternately stacked was named as RTED. The results revealed that under three-dimensional compressive stress, {10-12} tensile twinning dominated the first stage deformation in container. As the plunger continuous press down, dynamic recrystallization(DRX) occurred, and the newly fine DRXed grains along original and twin grain boundaries gradually consumed the matrix and twin grains. The microstructure was completely transformed into recrystallized grain structure at sizing band with an average grain size of ～0.9 μm in TED sample, smaller than that of RED *** the alloys extruded out of the die, DRXed grains significantly grew to ～4.5 μm and 3.5 μm for RED and TED samples, respectively. A laminated microstructure was obtained with average grain sizes of～4.4 μm in RD layers and 3.5 μm in TD layers for RTED sample. The AEB processed samples exhibited an ED-tilt double-peak basal texture with similar texture intensity. The tensile tests results indicated that attributed to the combined effect of grain refinement and texture evolution, the yield strength and fracture elongation of RED and TED samples was significantly improved. The heterogeneous microstructure in RTED sample induced an extra work hardening(HDI-work hardening) in tensile deformation and resulted in a further improved elongation of 32.0%.

关键词： Magnesium alloy Accumulated extrusion bonding Initial orientation Microstructure Texture Mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Segregation of Si and Mg at Fe(110)/Al(110) Interface

引用

Journal of Wuhan University of technology(Materials Science) 2023年第3期38卷 659-664页

作者：王洪金苏旭平 WANG Jianhua 孙顺平 WANG Bin JIANG Yong Jiangsu Key Laboratory of Material Surface Science and Technology Changzhou UniversityChangzhou 213164China Jiangsu Key Laboratory of Advanced Materials Design and Additive Manufacturing Jiangsu University of TechnologyChangzhou 213001China School of Materials Science and Engineering Central South UniversityChangsha 410083China

The interface structure and electronic properties of Fe(110)/Al(110) are investigated by the first-principles plane-wave pseudopotential method. The interface segregation position of Si and Mg is determined, and the effect of Mg and Si on the interface binding of Fe(110)/Al(110) is analyzed by combining the work of separation and charge density. The results show that the Fe(110)/Al(110) interface energy of FeHollow coordination is smaller and the interface structure is more stable. The Fe(110)/Al(110) interface separation surface in the form of Fe-Hollow coordination appears at the sub interface layer on the side of Al(110)near the interface. The interface structure of Mg and Si segregation is similar to that of undoped alloy *** calculations also suggest that Mg and Si segregate on the Al(110) side of the interface and occupy the Al lattice on the Al(110) side. The segregation of Mg and Si elements will reduce the interface binding, primarily because the Fe-Si bond and Fe-Mg bond are weaker than Fe-Al bond.

关键词： Fe(110)/Al(110) interface structure works of separation first-principles

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：