检索结果-南通市图书馆

Reasonable design a high-entropy garnet-type solid electrolyte for all-solid-state lithium batteries

Journal of Energy Chemistry 2024年第9期96卷 414-423页

作者： Shiyu Yu Yandi li Jiaxin Luo Daming Chen liang Yang Yaqing Wei De li yuanxun li Yong Chen State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti ResourcesHainan UniversityHaikou 570228HainanChina State Key Laboratory of Electronic Thin Films1nd Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina Guangdong Key Laboratory for Hydrogen Energy Technologies School of Materials Science and Hydrogen EnergyFoshan UniversityFoshan 528000GuangdongChina

Traditional garnet solid electrolyte(li_(7)La_(3)Zr_(2)O_(12))suffers from low room temperature ionic conductivity,poor air stability,high sintering temperature and energy *** the development prospects of high-entropy materials with high structural disorder and strong component controllability in the field of electrochemical energy storage,herein,a novel high-entropy garnet-type oxide solid electrolyte,li_(5.75)Ga_(0.25)La_(3)Zr_(0.5)Ti_(0.5)Sn_(0.5)Nb_(0.5)O_(12)(LGLZTSNO)was constructed by partially replacing the li and Zr sites in li_(7)La_(3)Zr_(2)O_(12)with Ga and Ti/Sn/Nb elements,*** experimental and density functional theory(DFT)calculation results show that the high-entropy LGLZTSNO electrolyte has preferable room temperature ion conductivity,air stability,interface contact performance with lithium anode,and the ability to suppress lithium *** to the improvement of electrolyte performance,the critical current density of li/Ag@LGLZTSNO/li symmetric cell was increased from 0.42 to 1.57 mA cm^(−2),and the interface area specific impedance(IASR)was reduced from 765.2 to 42.3Ωcm^(2).Meanwhile,the li/Ag@LGLZTSNO/LFP full cell also exhibits excellent rate performance and cycling performance(148 mA h g^(−1)at 0.1 C and 124 mA h g^(−1)at 0.5 C,capacity retention up to 84.8%after 100 cycles at 0.1 C),showing the application prospects of high-entropy LGLZTSNO solid electrolyte in high-performance all solid state lithium batteries.

关键词： Garnet solid electrolyte Dual-site substitution High-entropy all solid-state lithium batteries(ASSLBs)

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

空心绣球状MoS_(2)/ZnS/ZnO异质结材料的制备及太阳光下降解四环素的研究

引用

贵州师范大学学报（自然科学版） 2024年第3期42卷 122-128页

作者：李荡张杨李远勋凯里学院理学院贵州凯里556011

采用水热法制备绣球状ZnO纳米微球,再以其为晶核,通过原位生长及氨的渗入腐蚀成功制备了空心绣球状MoS_(2)/ZnS/ZnO异质结光催化材料。采用SEM、TEM、XRD、XPS、BET及UV-VIS对样品的形貌、组织结构、成分、比表面积及光吸收等性能进行... 详细信息

采用水热法制备绣球状ZnO纳米微球,再以其为晶核,通过原位生长及氨的渗入腐蚀成功制备了空心绣球状MoS_(2)/ZnS/ZnO异质结光催化材料。采用SEM、TEM、XRD、XPS、BET及UV-VIS对样品的形貌、组织结构、成分、比表面积及光吸收等性能进行了表征。探讨了空心绣球状MoS_(2)/ZnS/ZnO异质结材料的形成机制,研究了空心绣球状MoS_(2)/ZnS/ZnO异质结材料催化降解机理及四环素的降解过程。结果表明:尺寸均一、比面积大的空心绣球状MoS_(2)/ZnS/ZnO异质结材料不仅能实现宽窄带隙材料的有效杂化,促进材料对太阳光中可见光的利用,还能使光生电子及空穴分别转移至ZnO CB和MoS_(2)VB中,有效地分离了光生电子空穴,光催化性能最佳。在太阳光模拟器的照射下反应2 h之后,8 h合成的空心绣球状MoS_(2)/ZnS/ZnO异质结材料对四环素的降解效果最好,降解率高达91%。

关键词：空心绣球状 MoS_(2)/ZnS/ZnO 原位生长催化降解机理四环素

来源：

维普期刊数据库博看期刊

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

季冻黄土地区框锚边坡预应力锚杆内力计算方法

引用

土木与环境工程学报（中英文） 2024年第4期46卷 75-81页

作者：李伟李元勋李辉董勤喜向田青海大学土木水利学院西宁810016 青海大学青海省建筑节能材料与工程安全重点实验室西宁810016 海南大学土木建筑工程学院海口570228

冻融土体与锚杆之间相互作用机理研究的不足,导致工程实践中未能充分考虑土体冻融对锚杆内力的影响。针对该问题,基于西宁市季冻湿陷性黄土冻融循环三轴剪切试验,建立考虑冻融次数影响的湿陷性黄土黏聚力经验关系式;根据锚固体与周围土... 详细信息

冻融土体与锚杆之间相互作用机理研究的不足,导致工程实践中未能充分考虑土体冻融对锚杆内力的影响。针对该问题,基于西宁市季冻湿陷性黄土冻融循环三轴剪切试验,建立考虑冻融次数影响的湿陷性黄土黏聚力经验关系式;根据锚固体与周围土层的变形协调关系,推导冻融条件下框架预应力锚杆锚固段轴力和剪应力的解析式,将理论计算结果与现场试验结果进行对比验证,并分析冻融次数对锚固段轴力和剪应力的影响。结果表明:随冻融次数的增加,土体黏聚力呈指数型下降,锚固段轴力和剪应力在前3次冻融循环中急剧增大,冻融次数达到7次后趋于稳定;相较锚固段末端,锚固段始端轴力受冻融次数的影响更大,但锚固段始端至末端的剪应力随冻融次数的变化规律基本相同;现场试验结果验证了计算方法的合理性。

关键词：土体冻融框锚边坡湿陷性黄土黏聚力锚杆内力

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Crystal structure,microstructure and magnetic properties of SmCo-based films treated by different annealing methods

引用

Journal of Rare Earths 2012年第1期30卷 34-37页

作者： PENG Long li yuanxun College of Optoelectronics Technology Chengdu University of Information TechnologyChengdu 610225China

Effect of conventional thermal annealing（CTA） and rapid recurrent thermal annealing（RRTA） processes on crystal structure,mi-crostructure,and magnetic properties of the SmCo-based films were *** results indicated that the CTA-treated films exhibited poor permanent magnetic properties,and a low intrinsic coercivity of 72.8 kA/m was *** hysteresis loop was obtained for the RRTA-treated films,providing better permanent magnetic *** intrinsic coercivity reached 312.0 kA/*** to the X-ray diffraction（XRD） and atomic force microscopy（AFM） results,the magnetic properties of the CTA-treated films and RRTA-treated films were found to be correlated with the crystal structure and microstructure,which were strongly determined by the annealing *** treatment led to poor crystallization effects for the films,and a rough surface（RMS=3.47 nm and P-V=35.42 nm） and large grain size of 92.7 nm were observed ***,the RRTA treatment exhibited great contributions on the crystallization of the films,which is accountable for the smooth surface（RMS=2.047 nm and P-V=16.43 nm） and fine grain size of 60.8 nm.

关键词： SmCo films crystallization coercivity 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

Low-temperature sintering and microwave dielectric properties of CaMg1−xli2xSi2O6(x=0−0.3)ceramics

引用

Journal of Advanced Ceramics 2020年第4期9卷 471-480页

作者： Fangyi Huang Hua Su yuanxun li Huaiwu Zhang Xiaoli Tang State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China Jiangxi Guo Chuang Industrial Park Development Co. Ltd.Ganzhou341000China

In this study, low-temperature fired CaMg1−xli2xSi2O6 microwave dielectric ceramics were prepared via the traditional solid-state reaction method. In this process, 0.4 wt% li2CO3-B2O3-SiO2-CaCO3-Al2O3 (LBSCA) glass was added as a sintering aid. The results showed that ceramics consisted of CaMgSi2O6 as the main phase. The second phases were CaSiO3 always existing and li2SiO3 occurring at substitution content x > 0.05. li+ substitution effectively lowered sintering temperature due to 0.4 wt% LBSCA and contributed to grain densification, and the most homogeneous morphology could be observed at x = 0.05. The effects of relative density, the second phase, and ionic polarizability on dielectric constant (εr) were investigated. The quality factor (Q × f) varied with packing fraction that concerned the second phase. Moreover, the temperature coefficient of the resonant frequency (τf) was influenced by MgO6 octahedral distortion and bond valence. Excellent dielectric properties of the CaMg1−xli2xSi2O6 ceramic was exhibited at x = 0.05 with εr = 7.44, Q × f = 41,017 GHz (f = 15.1638 GHz), and τf = −59.3 ppm/°C when sintered at 900 °C. It had a good application prospect in the field of low-temperature co-fired ceramic (LTCC) substrate and devices.

关键词： low permittivity low-temperature sintering crystal structure microwave dielectric properties

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

Characterization of the charge transport and electrical properties in solution-processed semiconducting polymers

引用

Science China(Physics,Mechanics & Astronomy) 2012年第5期55卷 786-791页

作者： WANG liGuo ZHANG HuaiWu TANG Xiaoli li yuanxun ZHONG ZhiYong State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China

The conventional charge transport models based on density- and field-dependent mobility, only having a non-Arrhenius tem- perature dependence, cannot give good current-voltage characteristics of poly （2-methoxy-5-（2＇-ethylhexyloxy）-p-phenylene vinylene）（MEH-PPV） hole-only devices. In this paper, we demonstrate that the current-voltage characteristics can give a good unified description of the temperature, carrier density mad electric field dependence of mobility based on both the Arrhenius temperature dependence and the non-Arrhenius temperature dependence. Fu^hermore, we perform a systematic study of charge transport and electrical properties for MEH-PPV. It is shown that the boundary carrier density has an important effect on the current-voltage characteristics. Too large or too small values of boundary carrier density will lead to incorrect cur- rent-voltage characteristics. The numerically calculated carrier density is a decreasing function of the distance to the interface, and the numerically calculated electric field is an increasing function of the distance. Both the maximum of carrier density and the minimum of electric field appear near the interface.

关键词： charge transport electrical properties semiconducting polymers

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

High sintering and dielectric performance:The improved(Mg,Zn)_(3)B_(2)O_(6) ceramics with the help of the DFT calculation

引用

镁合金学报(英文) 2023年第6期11卷 2142-2150页

作者： Rui Peng Yongcheng Lu liang Shi Guoliang Yu Yuanming Lai Gang Wang yuanxun li Hua Su Huaiwu Zhang State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China China Jiliang University Hangzhou 310018China Chengdu University of Technology Chengdu 610059China

With the help of the first principle calculation,the solid-state reaction experiment was conducted to investigate the alteration in the sintering and the microwave dielectric properties of Mg_(3)B_(2)O_(6)ceramic with many Zn^(2+)*** properties were characterized using the scanning electron microscopy,network analyzer,X-ray diffraction,Raman spectroscopy,energy-dispersive spectroscopy,and thermomechanical and differential-thermal *** coexistence of Mg_(3)B_(2)O_(6),Mg_(2)B_(2)O_(5)and ZnO ceramics could be observed with increasing Zn^(2+)addition,and the lattice distortion occurred in the Mg_(2)B_(2)O_(5)and Mg_(3)B_(2)O_(6)ceramics due to the substitution of Mg^(2+)with Zn^(2+).The electron density and the bond property of the MgO_(6)octahedron changed,and a quantitative method was used to discuss the variation in sintering,substitution and phase formation *** densification window was decreased to 1100℃,and the dielectric properties improved with the formation of a three-phase borate solid solution(dielectric constant=6.73,quality factor=112,000 GHz at 16 GHz(Q=7000),temperature coefficient of resonant frequency=-61.2 ppm℃^(-1),and relative density=97.0%).

关键词： DFT Borate Solid solutions Dielectric properties

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

Enhanced microwave dielectric properties of wolframite structured Zn_(1-x)Cu_(x)WO_(4) ceramics with low sintering temperature

引用

Journal of Materiomics 2021年第6期7卷 1309-1317页

作者： Qin Zhang Xiaoli Tang Fangyi Huang Xiaohui Wu yuanxun li Hua Su State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China Jiangxi Xingkang Electronic Technology Co LtdGanzhouChina

The crystal structure,Raman vibration,chemical bond characteristics,and microwave dielectric properties of Zn_(1-x)Cu_(x)WO_(4)(x=0-0.15)ceramics prepared by a solid-state reaction were investigated by XRD refinement,Raman spectroscopy,P-V-L theory and *** to the P-V-L theory,the properties of the W-O bond are stronger than those of the Zn-O bond,which makes a major contribution to the dielectric *** relative permittivity is mainly affected by the average bond ionicity,and the variations in the dielectric loss and tf are mainly attributed to the lattice energy and bond *** shows that the presence of Cut could produce oxygen vacancy defects,increasing the dielectric ***,Raman spectra show that the increasing molecular polarizability causes the Raman shift to move to a low wavenumber,and the changes in Raman intensity and FWHM lead to a decrease in the degree of short-range ***,Zn_(0.97)Cu_(0.03)WO_(4) ceramics sintered at 925℃ showed satisfactory properties(εr=14.20,tanδ=1.473×10^(-4) at 9.087 GHz,and tf=-40 ppm/℃),which can potentially be applied to LTCC technology and indicate that Cu substitution can not only reduce the sintering temperature,but also optimize the dielectric properties.

关键词： P-V-L theory Microwave dielectric properties Raman spectra Zn_(1-x)Cu_(x)WO_(4) XPS

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

Amelioration of sintering and multi-frequency dielectric properties of Mg_(3)B_(2)O_(6):A mechanism study of nickel substitution using DFT calculation

引用

Journal of Advanced Ceramics 2021年第6期10卷 1398-1407页

作者： Rui PENG Yongcheng LU Qin ZHANG Yuanming LAI Guoliang YU Xiaohui WU yuanxun li Hua SU Huaiwu ZHANG State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China School of Information Science and Technology Chengdu University of TechnologyChengdu 610059China College of Information Engineering China Jiliang UniversityHangzhou 310018China Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China

With the support of density functional theory(DFT)calculation,the amelioration of sintering and dielectric properties of the Mg_(3)B_(2)O_(6)(MBO)ceramic was realized through the substitution of magnesium with *** TE-mode cylindrical cavity method was used to measure the dielectric properties at different *** thermo-mechanical analysis and simultaneous thermal analysis were used to characterize the chemical and mechanical *** phase composition was determined through the X-ray diffraction(XRD)and Raman *** microstructure was investigated using the scanning electron microscopy(SEM).Magnesium substitution with nickel(4 mol%)could ionize the B-0 bond of BO3,modify the vibration mode,improve the order degree,densify the microstmcture,decrease the intrinsic densification temperature,and ameliorate the dielectric properties of the MBO *** maximum values were achieved for the ceramics with 4 mol%nickel and sintered at 1175℃,that is,97.2%for relative density,72,600 GHz(10 GHz),75,600 GHz(11.4 GHz),and 92,200 GHz(15 GHz)for Q×f,7.1(10 GHz),7.01(11.4 GHz),and 6.91(15 GHz)for£r,and-56.3 ppm/℃ for if.

关键词： borate density flinctional theory(DFT) low dielectric constant dielectric properties

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

Strain-regulated sensing properties of α-Fe_(2)O_(3) nano-cylinders with atomic carbon layers for ethanol detection

引用

Journal of Materials Science & Technology 2021年第9期68卷 132-139页

作者： Huajing Xiong Jianan Fu Jinyao li Rashad Ali Hong Wang Yifan liu Hua Su yuanxun li Woon-Ming Lau Nasir Mahmood Chunhong Mu Xian Jian School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China Institute of Chemistry National Institute of Measurement and Testing Technology of ChinaChengdu 610021China School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Jiangxi Guo Chuang Industrial Park Development Co. LtdGanzhou 341000China Institute of Fundamental and Frontier Science University of Electronic Science and Technology of ChinaChengdu 610054China School of Engineering RMIT University124 La Trobe Street3001 MelbourneVictoriaAustralia National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 611731China

The sensitivity of ethanol sensor is of paramount importance in a variety of areas,including chemical production with ethanol,alcohol testing for driving safety,***,α-Fe_(2)O_(3) nano-cylinders with atomic carbon layers are synthesized,for the first time,through in-situ catalytic chemical vapor deposition combined with hydrothermal techniques for the detection of *** reported α-Fe_(2)O_(3)@C nano-cylinders with double surficial strain effects deliver an ethanol detection sensitivity of 8 times as compared with α-Fe_(2)O_(3) nano-cylinders,10 times higher as compared with its detection sensitivity to ammonia,para-xylene,methanol and *** sensor also exhibits over-14-day operation stability and the minimum detection limit of 10 *** our best knowledge,the performances surpass those of previously reported α-Fe_(2)O_(3).Such attractive performances are attributed to the enhanced charge transfer in α-Fe_(2)O_(3) owing to the double surficial strain effects of α-Fe_(2)O_(3)@C nano-cylinders and the efficient adsorption of ethanol with atomic carbon layers.

关键词： Gas sensor Nano-cylinder Hybrid microstructure Sensitivity Carbon coating

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

在线全文

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

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：