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Studies on the displacement reaction of Trialkylaluminum with Ethylene Catalyzed by Nitrogen Chelate Cobalt Complexes

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Chinese Chemical Letters 2003年第2期14卷 135-137页

作者： Bin ZHOU Ren HE State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116012

The catalytic properties of a series of cobalt complexes containing bidenated nitrogen ligand for displacement reaction of trialkylaluminum with ethylene is reported. Effect of different reaction time, temperature an... 详细信息

关键词： Ethylene displacement reaction trialkylaluminum cobalt complex.

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Effect of CuO Particle Size on the Microstructure Evolution of Al_2O_(3P)/Al Composites Prepared Via displacement reactions in the Al/CuO System

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Acta Metallurgica Sinica(English Letters) 2015年第6期28卷 699-706页

作者： Ge Zhao Zhi-Ming Shi Rui-Ying Zhang School of Materials Science and Engineering Inner Mongolia University of Technology

An A1203p/A1 composite was successfully synthesized using a displacement reaction between 80 wt% A1 and 20 wt% CuO powders at a heating rate of 5 ℃/min. Two different sizes CuO particles were used, and all the experiments were conducted under an argon atmosphere. To analyze the microstructural evolution during synthesis, the A1-20 wt% CuO samples were heated to the temperatures selected according to the differential scanning calorimetry curve and then immediately quenched with water. The phase composites and microstructure of the water-quenching samples were in- vestigated using X-ray diffraction, optical microscopy, scanning electron microscopy and energy-dispersive spectrometry. The results indicate that the CuO particle size has a significant effect on the microstructural evolution of the samples during the heating stage and on the microstructure of synthesized composites. Smaller CuO particles can decrease the reaction temperature, narrow the reaction temperature range at the different reaction stages during the heating stage and make the size and distribution of in situ A1203 particles more uniform. The reaction between A1 and CuO can be complete as the temperature rises to 900 ℃. The size of the in situ A1203 particles is approximately 5 μm when the size of the CuO particles is less than 6 μm. This sample has a relatively high Rockwell hardness of 60 HRB.

关键词： AI203p/AI composite displacement reaction CuO particles Particle size Microstructureevolution

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High area-capacity Mg batteries enabled by sulfur/copper integrated cathode design

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Journal of Energy Chemistry 2022年第9期31卷 370-378,I0011页

作者： Zhenfang Zhou Aobing Du Weijie Kong Zhuang Chen Zhonghua Zhang Bingbing Chen Yitao He Shanmu Dong Zhenjiang Li Guicun Li Guanglei Cui College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101ShandongChina Department of Energy Science and Engineering Nanjing Tech UniversityNanjing 211816JiangsuChina Department of Physics Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

Rechargeable Mg batteries potentially display lower cost and competitive energy density compared with their Li-ion ***,the practical implementation of high area-capacity cathodes still remains a formidably challenging *** work presents the sulfur/copper integrated cathodes fabricated by the conventional blade-coating process and slurry-dipping *** sulfur/copper foil integrated cathodes deliver a high area-capacity of 2.6 mAh cm^(-2)after 40 cycles,while the sulfur/copperfoam integrated cathode exhibits an ultrahigh area-capacity of 35.4 mAh cm^(-2),corresponding to 743.1 Wh L^(-1)at the electrode level(1.5 times higher than the LiCoO_(2)-graphite system).The in-situ formed copper sulfide intermediates with sufficient cation defects can act as functional intermediates to regulate the sulfur electrochemistry during the first discharge *** subsequent cycles are operated by the reversible displacement reaction between Mg-ions and copper sulfide active *** particular,the copper ions prefer to extrude along the[001]direction in copper sulfides lattice and simultaneously the rock-salt MgS crystals are ***,the nonuniform surface topography of the cycled Mgmetal anode,caused by the spatial inhomogeneity in current distribution,is demonstrated to lead to the battery performance degradation for high area-capacity Mg batteries.

关键词： Magnesium batteries Sulfur cathode displacement reaction Copper sulfides

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