检索结果-南通市图书馆

Anti-corrosion performance of Si-surface-alloying NdFeB magnets obtained with magnetron sputtering and thermal diffusion

引用

Journal of Rare Earths 2023年第8期41卷 1203-1210,I0003页

作者： Jin Tao Bang Liu Pengjie Zhang Guangqing Xu Jun Lv Jun Huang Jian Yan Wei Sun Bingshan Li Dongmei Wang Yucheng Wu School of materials Science and Engineering Hefei University of TechnologyHefei 230009China BGRIMM Technology Group Co. Ltd.Beijing 102600China National Engineering research center for Magnetic materials Beijing 102600China Key Laboratory of Advanced Functional materials and Devices of anhui province Anhui Provincial International S&T Cooperation Base for Advanced Energy MaterialsHefei University of TechnologyHefei 230009China

Si alloying in the surface layer of NdFeB magnets was realized by thermal diffusion combined with magnetron sputtering.The surface composition,phase structure and morphology of NdFeB(S-Si)specimens were characterized by an X-ray diffractometer,an X-ray photoelectron spectrometer and a field emission scanning electron microscope,respectively.The corrosion resistance of bare NdFeB(S-Si)was analyzed by static full immersion corrosion test and electrochemical experiments.Effects of sputtering and thermal diffusion on the microstructure and corrosion resistance of the surface layer were studied.Results show that surface alloying layer can effectively improve the corrosion resistance of bare NdFeB with the optimized static total immersion corrosion test time in NdFeB(1S-Si)-800 of 36 h,which is much longer than that of the pristine NdFeB(less than 0.5 h).The E_(corr)of NdFeB(1S-Si)-800 positively shifts from-1.05 to-0.92 V,indicating that the corrosion tendency is obviously lower.The J_(corr)is1.45×10^(-6)A/cm^(2)which is 2 orders of magnitude lower than that of the pristine NdFeB(5.25×10^(-4)A/cm^(2)).The intergranular composite oxides existing in Nd-rich phase contribute to the enhancement of corrosion resistance of Si-surface-alloying NdFeB.

关键词： NdFeB magnets Si surface alloying Magnetron sputtering Thermal diffusion Corrosion resistance Rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Near‑Instantaneously Self‑Healing Coating toward Stable and Durable Electromagnetic Interference Shielding

引用

Nano-Micro Letters 2021年第11期13卷 452-467页

作者： Lihua Zou Chuntao Lan Songlin Zhang Xianhong Zheng Zhenzhen Xu Changlong Li Li Yang Fangtao Ruan Swee Ching Tan anhui province international cooperation research center of textile structure composite materials Anhui Polytechnic UniversityAnhui 241000WuhuPeople’s Republic of China Department of materials Science and Engineering National University of Singapore9 Engineering Drive 1Singapore 117575Singapore Key Laboratory of Eco‑textiles Ministry of EducationJiangnan UniversityWuxi 214122JiangsuPeople’s Republic of China Department of Mechanical Engineering University of DelawareNewarkDE 19716USA

Durable electromagnetic interference(EMI)shielding is highly desired,as electromagnetic pollution is a great concern for electronics’stable performance and human health.Although a superhydrophobic surface can extend the service lifespan of EMI shielding materials,degradation of its protection capability and insufficient self-healing are troublesome issues due to unavoidable physical/chemical damages under long-term application conditions.Here,we report,for the first time,an instantaneously self-healing approach via microwave heating to achieve durable shielding performance.First,a hydrophobic 1H,1H,2H,2H-perfluorooctyltriethoxysilane(POTS)layer was coated on a polypyrrole(PPy)-modified fabric(PPy@POTS),enabling protection against the invasion of water,salt solution,and corrosive acidic and basic solutions.Moreover,after being damaged,the POTS layer can,for the first time,be instantaneously self-healed via microwave heating for a very short time,i.e.,4 s,benefiting from the intense thermal energy generated by PPy under electromagnetic wave radiation.This self-healing ability is also repeatable even after intentionally severe plasma etching,which highlights the great potential to achieve robust and durable EMI shielding applications.Significantly,this approach can be extended to other EMI shielding materials where heat is a triggering stimulus for healing thin protection layers.We envision that this work could provide insights into fabricating EMI shielding materials with durable performance for portable and wearable devices,as well as for human health care.

关键词： Electromagnetic interference shielding Superhydrophobic coating Multifunctional textiles Self-healing Conductive polymer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microwave-assisted synthesis of Cr_(3)C_(2)@C core shell structure anchored on hierarchical porous carbon foam for enhanced polysulfide adsorption in Li-S batteries

引用

Nano research 2021年第7期14卷 2345-2352页

作者： Xierong Zeng Jianxin Tu Shuangshuang Chen Shaozhong Zeng Qi Zhang Jizhao Zou Kezhi Li Shenzhen Key Laboratory of Special Functional materials&Shenzhen Engineering Laboratory for Advance Technology of ceramics College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Solidification Processing Carbon/Carbon Composites Research CenterNorthwestern Polytechnical UniversityXi’an 710072China School of materials Science and Engineering Anhui University of TechnologyMa'anshan 243002China College of New materials and New Energies Shenzhen Technology UniversityShenzhen 518118China BCmaterials Basque Center for MaterialsApplications and NanostructuresUPV/EHU Science Park48940 LeioaSpainIKERBASQUEBasque Foundation for Science48013 BilbaoSpain

In this paper,we use microwave reduction strategy to synthesize a new bi-functional sulfur host material at the service of cathode substrate for lithium-sulfur batteries(LSBs),the composite is made of hierarchical porous carbon foam supported carbon-encapsulated chromium carbide nano-particles(Cr_(3)C_(2)@C/HPCF),in which the well-distributed conductive Cr_(3)C_(2) nano-particles can act as powerful chemical adsorbent and are effective in restraining the shuttle effect of lithium polysulfides(LiPSs).Test results show that the Cr_(3)C_(2)@C/HPCF based sulfur electrodes with 75 wt.%of sulfur exhibit a high initial discharging capacity of 1,321.1 mAh·g^(−1) at 0.1 C(3.5 mg·cm^(−2)),and a reversible capacity can still maintain stability at 1,002.1 mAh·g^(−1) after 150 cycles.Even increasing the areal sulfur loading to 4 mg·cm^(−2),the electrodes can still deliver an initial discharging capacity of 948.0 mAh·g^(−1) at 0.5 C with ultra-slow capacity decay rate of 0.075%per cycle during 500 cycles.Furthermore,the adsorption energy between the Cr_(3)C_(2) surface and LiPSs as well as theoretic analysis based on first-principles is also investigated.

关键词： Cr_(3)C_(2)nanoparticles core shell structure chemisorptions microwave reduction hierarchical porous carbon foam Li-S batteries

来源：

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

纳米结构的多孔球形NiO@NiMoO4@PPy作为先进的电化学赝电容器材料

引用

Science Bulletin 2020年第7期65卷 546-556,M0004页

作者：伊廷锋仇立英梅杰齐思雨崔平罗绍华朱彦荣谢颖贺艳兵 School of materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory of Functional Inorganic Material Chemistry Ministry of EducationSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China Shenzhen Geim Graphene center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China School of Chemistry and Chemical Engineering Anhui University of TechnologyMaanshan 243002China School of Resources and materials Northeastern University at QinhuangdaoQinhuangdao 066004China Key Laboratory of Dielectric and Electrolyte Functional Material Hebei province Qinhuangdao 066004China

构建了一种PPy缠绕的多孔球形NiO@NiMoO4材料,并应用于高性能的超级电容器.结果表明,NiO改性改变了NiMoO4的形貌,NiO@NiMoO4和NiO@NiMoO4@PPy均呈现一种内部中空和外壳多孔的形貌,并具有较大的比表面积,进而促进了离子和电荷的转移.NiM... 详细信息

构建了一种PPy缠绕的多孔球形NiO@NiMoO4材料,并应用于高性能的超级电容器.结果表明,NiO改性改变了NiMoO4的形貌,NiO@NiMoO4和NiO@NiMoO4@PPy均呈现一种内部中空和外壳多孔的形貌,并具有较大的比表面积,进而促进了离子和电荷的转移.NiMoO4和PPy壳具有较高的电子电导率,降低了NiO的电荷转移电阻,进而提高了其电化学动力学性能.在电流密度为20A/g时,NiO,NiMoO4,NiO@NiMoO4和NiO@NiMoO4@PPy电极的初始放电比电容分别为456.0,803.2,764.4和941.6F/g.在电流密度增大至30A/g时,NiO@NiMoO4@PPy电极的初始放电比电容为850.2F/g,30000次循环后比电容仍达到655.2F/g,电容保有率为77.1%.第一性原理计算结果表明,更强的Mo–O有利于稳定NiO@NiMoO4复物的结构,进而提高了其循环稳定性.

关键词：较大的比表面积第一性原理计算纳米结构电化学动力学比电容超级电容器电子电导率电流密度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

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：