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Co3O4 nanocage derived from metal-organic frameworks: An excellent cathode catalyst for rechargeable Li-O2 battery

Nano Research 2019年第7期12卷 1555-1562页

作者： Zhuoliang Jiang Hui Sun Wenke Shi Tianhang Zhou Jianyong Hu Jingyang Cheng Pengfei Hu Shigang Sun State Key Laboratory of Heavy Oil Processing Beijing Key Laboratory of biogas upgrading utilizationCollege of New Energy and MaterialsChina University of Petroleum-BeijingBeijing 102249China State Key Lab of PCOSS Xiamen UniversityXiamen 361005China eduard-zintl-institut fur anorganische und physikalische chemie Technische UniversitatDarmstadtAlarich-Weiss-Strasse 8D-64287 DarmstadtGermany

Rechargeable non-aqueous Li-O2 battery is regarded as one of the most promising energy-storage technologies on account of its high energy *** is believed that the rational design of three-dimensional (3D) architecture for catalyst is a key factor for the remarkable ***-organic frameworks (MOFs) derived materials possess excellent architecture,which is beneficial for Li-O2 *** this work,ZIF-67 is used as precursor template and calcinated under different temperature to produce Co3O4 *** the anneal treatment is under 350℃,the derived Co3O4 nanocage holds the most complete skeleton,which provides better charge transfer ability as well as O2 and Li^+ ***,the Co3O4 nanocage owns more oxygen vacancies,offering more active *** the synergistic effect of nanocage structure and active sites,the Co3O4 nanocage stably delivers a large specific capacity of 15,500 mAh·g^-1 as well as a long cycle-life of 132 cycles at limited discharge capacity of 1,000 mAh·g^-1 under discharge/charge current density of 0.5 A·g^-1.

关键词： U-O2 batteries metal-organic framework (MOF)-derived Co3O4 nanocage Co3O4 polyhedron Co3O4 particle

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Boron-modified perhydropolysilazane towards facile synthesis of amorphous SiBN ceramic with excellent thermal stability

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Journal of Advanced Ceramics 2022年第7期11卷 1104-1116页

作者： Ying ZHAN Wei LI Tianshu JIANG Claudia FASEL Emmanuel III RICOHERMOSO Jan BERNAUER Zhaoju YU Zhenghao WU Florian MÜLLER-PLATHE Leopoldo MOLINA-LUNA Ralf GROTTENMÜLLER Ralf RIEDEL Department of Materials and Earth Sciences Technical University of DarmstadtD-64287 DarmstadtGermany College of Materials Key Laboratory of High Performance Ceramic Fibers(Xiamen University)Ministry of EducationXiamen 361005China eduard-zintl-institut für anorganische und physikalische chemie Technical University of DarmstadtD-64287 DarmstadtGermany Merck KGaA Performance MaterialsD-64293DarmstadtGermany

SiBN ceramics are widely considered to be the most promising material for microwavetransparent applications in harsh environments owing to its excellent thermal stability and low dielectric *** work focuses on the synthesis and ceramization of single-source precursors for the preparation of SiBN ceramics as well as the investigation of the corresponding microstructural evolution at high temperatures including molecular dynamic ***-and chlorine-free perhydropolysilazanes were reacted with borane dimethyl sulfide complex at different molar ratios to synthesize single-source precursors,which were subsequently pyrolyzed and annealed under N2 atmosphere(without ammonolysis)to prepare SiBN ceramics at 1100,1200,and 1300℃with high ceramic yield in contrast to previously widely-used ammonolysis synthesis *** obtained amorphous SiBN ceramics were shown to have remarkably improved thermal stability and oxidation resistance compared to amorphous silicon ***,the experimental results have been combined with molecular dynamics simulation to further study the amorphous structure of SiBN and the atomic-scale diffusion behavior of Si,B,and N at 1300℃.Incorporation of boron into the Si–N network is found to suppress the crystallization of the formed amorphous silicon nitride and hence improves its thermal stability in N2 atmosphere.

关键词： polymer-derived ceramics(PDCs) SiBN crystallization molecular dynamics oxidation resistanc

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Ultra-light, high flexible and efficient CNTs/Ti3C2-sodium alginate foam for electromagnetic absorption application

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Journal of Materials Science & Technology 2019年第12期35卷 2859-2867页

作者： Xingmin Liu Nan Chai Zhaoju Yu Hailong Xu Xinliang Li Jiquan Liu Xiaowei Yin Ralf Riedel College of Materials Key Laboratory of High Performance Ceramic Fibers(Xiamen University)Ministry of EducationXiamen361005China institutfiir Materialwissenschaft Technische Universitdt DarmstadtD-64287DarmstadtGermany College of Materials Fujian Key Laboratory of Advanced MaterialsXiamen UniversityXiamen361005China Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical UniversityXi'an710072China Technische Universitat Darmstadt Eduard-Zintl-lnstitutfur Anorganische und Physikalische ChemieAlarich-Weiss-Straβe 4.D-64287DarmstadtGermany

Ultra-light carboxylic functionalized multi-walled carbon nanotubes(CNTs-COOH) and Ti3C2 MXene hybrids modified sodium alginate(CNTs/Ti3C2-SA) based composite foams were prepared through ice-templated freeze-drying method. The microstructure of the synthesized CNTs/Ti3C2 hybrids and CNTs/Ti3C2-SA foams is characterized by the presence of CNTs inserted between MXene layers which prevents their restacking. The resultant CNTs/Ti3C2 hybrids exhibit a unique sandwich-like hierarchical structure. Scanning electron microscopy(SEM) images show that the CNTs/Ti3C2-SA foam exhibits a heterogeneous anisotropic microstructure and CNTs/Ti3C2 hybrids are homogeneously dispersed in the skeleton of the porous foam. In case that the content of the hybrids amounts 40 mg/cm^3, the CNTs/Ti3C2-SA foam possesses excellent electromagnetic(EM) absorption performance with a minimum reflection coefficient(RCmin) as low as-40.0 dB. In case of a sample thickness of 3.95 mm, the RCminreaches-24.4 dB and the effective absorption bandwidth covers the whole X band from 8.2 to 12.4 GHz. A control test shows that, with the same absorbent content, the CNTs/Ti3C2-SA foam exhibits a far better EM performance than that of CNT-free Ti3C2-SA foam.

关键词： Carbon nanotubes MXene Sodium alginate Electromagnetic absorption properties

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High-yield synthesis and liquid-exfoliation of two- dimensional belt-like hafnium disulphide

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Nano Research 2018年第1期11卷 343-353页

作者： Harneet Kaur Sandeep Yadav Avanish K. Srivastava Nidhi Singh Shyama Rath Jorg J. Schneider Om P. Sinha Ritu Srivastava National Physical Laboratory Council of Scientific and Industrial Research Dr. K. S. Krishnan Road New Delhi I I O012 India Academy of Scientific and Innovative Research NPL New Delhi 110012 India Technische Universitat Darmstadt Eduard-ZintMnstitut f~r Anorganische und Physikalische Chemie 12 105 117 Alarich-Weiss-Str 12 64287 Darmstadt Germany DepartmentofPhysics andAstrophysics University of Delhi Delhi 110007 India Amity institute of Nanotechnology Amity University UP Sector 125 Noida Uttar Pradesh 201313 India

Producing environmentally stable monolayers and few-layers of hafnium disulphide （HfS2） with a high yield to reveal its unlocked electronic and optoelectronic applications is still a challenge. HfS2 is a layered two-dimensional material of group-IV transition metal dichalcogenides. For the first time, we demonstrate a simple and cost-effective method to grow layered belt-like nanocrystals of HfS2 with a notably large interlayer spacing followed by their chemical exfoliation. Various microscopic and spectroscopic techniques confirm that these as-grown crystals exfoliate into single or multiple layers in a few minutes using solvent assisted ultrasonification method in N-cyclohexyl-2- pyrrolidone. The exfoliated nanosheets of HfS2 exhibit an indirect bandgap of 1.3 eV with high stability against surface degradation. furthermore, we demonstrate that these nanosheets hold potential for electronic applications by fabricating a field-effect transistor based on few-layered HfS2, exhibiting a field-effect mobility of 0.95 cm2/（V.s） with a high on/off current modulation ratio of 10,000 in ambient conditions. The method is scalable and has a potential significance for both academic and industrial purposes.

关键词： two-dimensionalmaterials hafnium disulphide nano-crystals liquid-phase exfoliation environment-stabili~ field-effect transistor

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分子动力学模拟与模型结合研究填料（石墨烯,碳纳米管）接枝分子链对尼龙纳米复合材料导热性能的影响

分子动力学模拟与模型结合研究填料（石墨烯,碳纳米管）接枝分子...

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中国化学会第十九届全国化学热力学和热分析学术会议

作者：高洋洋张立群 Florian Muller-Plathe 先进弹性体研究中心北京化工大学 eduard-zintl-institut für anorganische und physikalische chemie and Profile Area Thermofluids & Interfaces Technische Universit?t Darmstadt

通过使用反转非平衡分子动力学模拟方法,我们使用全原子模型考察了石墨烯碳纳米管接枝分子链对尼龙纳米复合材料导热性能的影响。石墨烯尼龙界面热导与接枝分子链密度成正比;但是随着接枝长度的上升,它先上升然后逐渐趋于饱和。但是由... 详细信息

通过使用反转非平衡分子动力学模拟方法,我们使用全原子模型考察了石墨烯碳纳米管接枝分子链对尼龙纳米复合材料导热性能的影响。石墨烯尼龙界面热导与接枝分子链密度成正比;但是随着接枝长度的上升,它先上升然后逐渐趋于饱和。但是由于接枝分子链显著地破坏了石墨烯的平面共轭结构,石墨烯本身的热导显著下降。我们用经验方程描绘了材料界面热导与接枝密度和接枝长度的关系。通过结合EMA模型,我们发现石墨烯尼龙纳米复合材料热导在中等接枝条件下达到最大值。我们的模拟结论能与实验基本符合。另外,我们考察了碳纳米管间热导与接枝密度,接枝长度和管间距离的关系。我们提出了一个热环流模型描述了三者之间的关系。本工作有助于提高对接枝法改善聚合物填料复合材料热导的认识,为制备高热导率的聚合物复合材料提供新的思路。

关键词：分子动力学模拟尼龙复合材料接枝导热

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分子动力学模拟与模型结合研究填料（石墨烯,碳纳米管）接枝分子链对聚合物纳米复合材料导热性能的影响

分子动力学模拟与模型结合研究填料（石墨烯,碳纳米管）接枝分子...

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第十四届中国橡胶基础研究研讨会

作者：高洋洋张立群 Florian Muller-Plathe 先进弹性体研究中心北京化工大学 eduard-zintl-institut für anorganische und physikalische chemie and Profile Area Thermofluids ＆ Interfaces Technische Universit?t Darmstadt

通过使用反转非平衡分子动力学模拟方法,我们使用全原子模型考察了石墨烯碳纳米管接枝分子链对聚合物纳米复合材料导热性能的影响。石墨烯尼龙界面热导与接枝分子链密度成正比;但是随着接枝长度的上升,它先上升然后逐渐趋于饱和。但是... 详细信息

通过使用反转非平衡分子动力学模拟方法,我们使用全原子模型考察了石墨烯碳纳米管接枝分子链对聚合物纳米复合材料导热性能的影响。石墨烯尼龙界面热导与接枝分子链密度成正比;但是随着接枝长度的上升,它先上升然后逐渐趋于饱和。但是由于接枝分子链显著地破坏了石墨烯的平面共轭结构,石墨烯本身的热导显著下降。我们用经验方程描绘了材料界面热导与接枝密度和接枝长度的关系。通过结合EMA模型,我们发现石墨烯尼龙纳米复合材料热导在中等接枝条件下达到最大值。我们的模拟结论能与实验基本符合。另外,我们考察了碳纳米管间热导与接枝密度,接枝长度和管间距离的关系。我们提出了一个热环流模型描述了三者之间的关系。本工作有助于提高对接枝法改善聚合物填料复合材料热导的认识,为制备高热导率的聚合物复合材料提供新的思路。

关键词：分子动力学模拟尼龙复合材料接枝导热

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