检索结果-南通市图书馆

Synthesis and electrochemical properties of dual doped spinels LiNi_xAl_yMn_(2-x-y)O_4 via facile novel chelated sol–gel method as possible cathode material for lithium rechargeable batteries

引用

Journal of Energy Chemistry 2017年第1期26卷 101-114页

作者： R.Thirunakaran Gil Hwan Lew Won-Sub Yoon CSIR-Central Electrochemical Research Institute Sungkyunkwan University Department of Energy Science

LiMnOand LiNiAlyMnO（x= 0.50;y = 0.05-0.50） powders have been synthesized via facile solgel method using Behenic acid as active cheiating agent.The synthesized samples are subjected to physical characterizations such as thermo gravimetric analysis（TG/DTA）,X-ray diffraction（XRD）,Fourier transform infrared spectroscopy（FT-IR）,field-emission scanning electron microscopy（FESEM）,transmission electron microscopy（TEM） and electrochemical studies viz.,galvanostatic cycling properties,electrochemical impedance spectroscopy（EIS） and differential capacity curves（dQ/dE）.Finger print XRD patterns of LiMnOand LiNiAlMnOfortify the high degree of crystallinity with better phase purity.FESEM images of the undoped pristine spinel illustrate uniform spherical grains surface morphology with an average particle size of 0.5 μm while Ni doped particles depict the spherical grains growth（50nm） with ice-cube surface morphology.TEM images of the spinel LiMnOshows the uniform spherical morphology with particle size of（100 nm） while low level of Al-doping spinel（LiNio.5Alo.05Mn1.45O4） displaying cloudy particles with agglomerated particles of（50nm）.The LiMnOsamples calcined at 850℃ deliver the discharge capacity of 130 mAh/g in the first cycle corresponds to 94%coiumbic efficiency with capacity fade of 1.5 mAh/g/cycle over the investigated 10 cycles.Among all four dopant compositions investigated,LiNiAlMnOdelivers the maximum discharge capacity of 126 mAh/g during the first cycle and shows the stable cycling performance with low capacity fade of 1 mAh/g/cycle（capacity retention of 92%） over the investigated 10 cycles.Electrochemical impedance studies of spinel LiMnOand LiNiAlMnOdepict the high and low real polarization of 1562 and 1100 Ω.

关键词： Multi-doping sol–gel method Behenic acid Differential capacity Spinel cathode

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

Microstructure and electric characteristics of AETiO3(AE=Mg, Ca, Sr)doped CaCu3Ti4O12 thin films prepared by the sol–gel method

引用

Progress in Natural Science:Materials International 2015年第5期25卷 399-404页

作者： Dong Xu Kai He Buhua Chen Chuanmeng Xu Shuyu Mu Lei Jiao Xiujuan Sun Yongtao Yang School of Material Science and Engineering Jiangsu University State Key Laboratory of Tribology Tsinghua University Changzhou Ming Errui Ceramics Co. Ltd.

This paper focuses on the effects of alkline-earth metal titante AETiO(AE = Mg,Ca,Sr) doping on the microstructure and electric characteristics of CaCuTiOthin films prepared by the sol-gel method.The results showed that the grain size of CCTO thin films could be increased by MgTiOdoping.The movement of the grain boundaries was impeded by the second phases of CaTiOand SrTiOconcentrating at grain boundaries in CaTiOand SrTiOdoped CCTO thin films.Rapid ascent of dielectric constant could be observed in 0.1Mg TiOdoped CCTO thin films,which was almost as three times high as pure CCTO thin film and the descent of the dielectric loss at low frequency could also be observed.In addition,the nonlinear coefficient(α),threshold voltage(V) and leakage current(I) of AETiOdoped CCTO thin films(AE = Mg,Ca,Sr) showed different variation with the increasing content of the MgTiO,CaTiOand SrTiO.

关键词： Thin films Microstructure Dielectric properties sol–gel method Alkline-earth metal titante

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Amine-functionalized mesoporous UiO-66 aerogel for CO_(2) adsorption

引用

Chinese Journal of Chemical Engineering 2023年第2期54卷 36-43页

作者： Mengge Shang Jing Zhang Jinqiang Sun Shimo Yu Feng Hua Xiaoxu Xuan Xun Sun Serguei Filatov Xibin Yi Shandong Key Laboratory for Special Silicon-containing Material Advanced Materials InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan 250014China Key Laboratory of High Efficiency and Clean Mechanical Manufacture Ministry of EducationNational Demonstration Center for Experimental Mechanical Engineering Education at Shandong UniversitySchool of Mechanical EngineeringShandong UniversityJinan 250061China Laboratory of Hydrogen Energy Institute of Heat and Mass Transfer of the National Academy of Sciences of BelarusMinsk 220072Belarus

A mesoporous UiO-66-NH_(2) aerogel is prepared via a straightforward sol-gel method without using any binders or mechanical pressures, in which the amine groups are directly introduced into the matrix by using 2-aminoterephthalic acid. The novel UiO-66-NH_(2) aerogel also exhibits high specific surface area and mesopore-dominated structure, implying its highly potential use in CO_(2) adsorption. For ulteriorly investigating the effect of amine loading on the CO_(2) adsorption ability, a series of UiO-66-NH_(2) aerogel with different amino content is fabricated by changing the ligand/metal molar ratio. When the molar ratio is 1.45, the CO_(2) adsorption capacity reaches the optimum value of 2.13 mmol·g^(-1) at 25 ℃ and 0.1 MPa, which is 12.2% higher than that of pure UiO-66 aerogel. Additionally, UiO-66-NH_(2)-1.45 aerogel also has noticeable CO_(2) selectivity against N_(2) and CH_(4) as well as good regeneration stability. Such results imply that it has good application prospect in the field of CO_(2) adsorption, and also contains the potential to be applied in catalysis, separation and other fields.

关键词： UiO-66-NH_(2)aerogel sol–gel method Amine groups Nanostructure Carbon dioxide Adsorption

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

Preparation and characterization of polypropylene/silica composite particle with interpenetrating network via hot emulsion sol–gel approach

引用

Progress in Natural Science:Materials International 2014年第5期24卷 42-49页

作者： Lei Zu Ruirui Li Longyi Jin Huiqin Lian Yang Liu Xiuguo Cui Department of Chemistry Yanbian University Beijing Key Lab of Special Elastomer Composite Materials Department of Material Science and EngineeringBeijing Institute of Petrochemical Technology

A novel interpenetrating structural ultrafine polypropylene-silica nanocomposite particles were synthesized by a modified sol–gel approach in the presence of the melt polypropylene emulsion. A series of samples with different polypropylene content was prepared to investigate the unique characteristics of this original nanocomposite. The thermal gravimetric analysis and differential scanning calorimetry results showed that the nanocomposites had the interpenetrating structure and good thermal stability,and the crystallization behavior of polypropylene was confined by the silica matrix. The interpenetrating structure of nanocomposites was also suggested by the nitrogen adsorption–desorption measurement results. The scanning electronic microscope and transmission electron microscopy images indicated that the nanocomposites had irregular particle morphology. The nanoparticle tracking analysis results show that the mean size of the nanocomposites was around 160 nm. According to the results obtained from different measurements,a reasonable formation mechanism was proposed.

关键词： Polypropylene Silica Nanocomposites sol–gel method Interpenetrating structure

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Synthesis of Al2O3-SiO2-MgO ceramics with hierarchical porous structure

引用

Journal of Advanced Ceramics 2017年第1期6卷 92-页

作者： Elena F.KRIVOSHAPKINA Pavel V.KRIVOSHAPKIN Aleksey A.VEDYAGIN Institute of Chemistry of Komi SC UB RAS Syktyvkar 167982 Russia ITMO University St.Petersburg 197101 Russia Boreskov Institute of Catalysis SB RAS Novosibirsk 630090 Russia National Research Tomsk Polytechnic University Tomsk 634050 Russia

A series of asymmetric cordierite ceramics with hierarchical porous structure were prepared and characterized. The macroporous support was obtained from natural raw materials (bauxite, silica sand, kaolinite, talc, and alumina) via ceramic technology. The prepared ceramic discs were characterized by a narrow pore size distribution. The average pore size was about 9.5 μm, and the open porosity was estimated to be 30%. Coating the discs with micro/mesoporous cordierite layer was performed using the sol–gel approach. Three-component sols were obtained from organic or inorganic precursors. Corresponding gels were calcined at 1200 °C to form the cordierite structure. The nature of precursor was found to affect the pore volume distribution. Narrow pore volume distribution was observed when organic precursors were used. Another key factor to control the parameters of final material was the drying condition. Supercritical drying of the gels has allowed us to increase the surface area in two orders of magnitude comparing with conventional drying procedure.

关键词： sol–gel method aerogels cordierite Al 2 O 3 –SiO 2 –MgO hierarchical porous structure

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

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

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

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：