期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到16,307篇文章
< 1 2 … 250 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Effects of La_2O_3/Li_2O/TiO_2-Coating on Electrochemical Performance of LiCoO_2 Cathode 认领 引用 被引量：6
1
作者 王洪 祝纶宇 陈鸣才 《Journal of Rare Earths》 SCIE EI CAS 2007年第1期124-128,共5页
Conventional cathode material （LiCoO2） was modified by coating with a thin layer of La2O3/Li2O/TiO2 for improving its performance for lithium ion battery. The morphology and structure of the modified cathode materia... Conventional cathode material （LiCoO2） was modified by coating with a thin layer of La2O3/Li2O/TiO2 for improving its performance for lithium ion battery. The morphology and structure of the modified cathode material was characterized by SEM, XRD, and Auger electron spectroscopy. The performance of the cells with the modified cathode material was examined, including the cycling stability, the diffusion coefficient under different voltages, and the C-rate discharge. The results showed that the cell composed of the coated cathode material discharged at a large current density, and possesses a stable cycle performance in the range from 3.0 to 4.4 V. It was explained that the rate of Li ion diffusion increased in the cell while using La2O3/Li2O/TiO2-coated LiCoO2 as the cathode and the coating layer may act as a faster ion conductor （La2O3/Li2O/TiO2）. 展开更多
关键词 La2O3/Li2O/TiO2-eoated LiCoO2 lithium-ion batteries diffusion coefficient fast ion conductor rare earths
暂未订购 下载PDF
Effects of SrO/Li_2O/La_2O_3/Ta_2O_5/TiO_2-coating on electrochemical performance of LiCoO_2 认领 引用
2
作者 王洪 邓璋琼 陈鸣才 《Journal of Rare Earths》 SCIE EI CAS 2009年第2期234-239,共6页
Commercial cathode material （LiCoO2） was modified by coating with a thin layer of SrO/Li2O/La2O3/Ta2O5/TiO2 for improving its performance in lithium ion battery. The morphology and structure of the modified cathode ... Commercial cathode material （LiCoO2） was modified by coating with a thin layer of SrO/Li2O/La2O3/Ta2O5/TiO2 for improving its performance in lithium ion battery. The morphology and structure of the modified cathode material were characterized by scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The performance including cycling stability, diffusion coefficient under different voltage, C-rate discharge of the batteries with this modified cathode material was examined. The results showed that the battery with the coated cathode material could discharge at a large current density, and it possessed a stable cycle performance in the range from 3.0 V to 4.2 V. It was explained that the rate of Li ion diffusion increased in the batteries using SrO/Li2O/La2O3/Ta2O5/TiO2-coated LiCoO2 as the cathode and the coated layer could act as a fast ion conductor （SrO/Li2O/La2O3/Ta2O5/TiO2） and as a protecting shell to prevent LiCoO2particles from being attacked by the acidic electrolyte. 展开更多
关键词 SrO/Li2O/La2O3/Ta2O5/TiO2-coated LiCoO2 lithium-ion batteries diffusion coefficient fast ion conductor rare earths
暂未订购 下载PDF
Au负载量对TiO2/Au光阳极光吸收能力的影响研究 认领 引用
3
作者 聂宗昊 闫伯涵 +1 位作者 祝孝栋 李秀玉 《应用物理》 2026年第5期456-464,共9页
为了研究Au负载量对TiO2/Au光阳极的光吸收能力的影响,本文采用水热法和柠檬酸钠还原法制备了TiO2/Au材料,通过刮涂法制备光阳极。利用紫外–可见吸收、X射线衍射(XRD)、透射电子显微镜(TEM)等手段对不同Au负载量的TiO2/Au材料和TiO2/A... 为了研究Au负载量对TiO2/Au光阳极的光吸收能力的影响,本文采用水热法和柠檬酸钠还原法制备了TiO2/Au材料,通过刮涂法制备光阳极。利用紫外–可见吸收、X射线衍射(XRD)、透射电子显微镜(TEM)等手段对不同Au负载量的TiO2/Au材料和TiO2/Au光阳极进行表征分析。结果表明,Au负载量在1.0 wt%时,TiO2/Au光阳极的光吸收能力最佳;低于1.0 wt%时,Au负载量提高,TiO2/Au光阳极的光吸收能力也随之提高;高于1.0 wt%时,Au负载量提高,TiO2/Au光阳极的光吸收能力随之降低。 展开更多
关键词 光阳极 TiO2 Au纳米颗粒 N719染料
暂未订购 下载PDF
NiO修饰梯度对金红石相TiO2基MEMS氢敏传感器性能的优化研究 认领 引用
4
作者 刘锦涛 鲍钰文 李晓博 《材料科学》 2026年第1期129-136,共8页
针对金红石相TiO2氢敏传感器存在的响应不足及选择性差的问题,本研究通过构建p-n异质结,开发了一种高性能的氢敏材料。采用水热法制备了不同NiO修饰量(1%~8%)的TiO2复合粉末,借助XPS、SEM等表征手段分析其结构形貌,并结合MEMS微热板器... 针对金红石相TiO2氢敏传感器存在的响应不足及选择性差的问题,本研究通过构建p-n异质结,开发了一种高性能的氢敏材料。采用水热法制备了不同NiO修饰量(1%~8%)的TiO2复合粉末,借助XPS、SEM等表征手段分析其结构形貌,并结合MEMS微热板器件测试气敏性能。结果表明,2% NiO修饰样品在391˚C下对1000 ppm氢气的响应值为金红石相TiO2的1.5倍,且对乙醇、CO等干扰气体具有优异选择性。本研究为高性能氢敏传感器的开发提供了有效的材料优化策略。 展开更多
关键词 金红石TiO2 NiO修饰梯度 P-N异质结 氢气传感 MEMS传感器 气敏机理
暂未订购 下载PDF
TiO2光催化技术处理印染废水的研究进展 认领 引用 被引量：9
5
作者 任敬 宗刚 +1 位作者 谢涛 景张欣 《化工新型材料》 CAS CSCD 北大核心 2025年第3期83-87,共5页
综述了二氧化钛(TiO2)光催化技术处理印染废水的研究进展,重点介绍了TiO2材料的改性方法,主要包括掺杂改性、材料负载、光敏化及半导体材料复合改性,并讨论了不同改性方法对TiO2结构和性能的影响。在此基础上,对TiO2光催化... 综述了二氧化钛(TiO2)光催化技术处理印染废水的研究进展,重点介绍了TiO2材料的改性方法,主要包括掺杂改性、材料负载、光敏化及半导体材料复合改性,并讨论了不同改性方法对TiO2结构和性能的影响。在此基础上,对TiO2光催化技术处理印染废水的研究前景进行了展望。 展开更多
关键词 印染废水 TiO2改性 光催化
暂未订购 下载PDF
Enhancing Alkaline Hydrogen Evolution Reaction on Ru- Decorated TiO2 Nanotube Layers: Synergistic Role of Ti3+, Ru Single Atoms, and Ru Nanoparticles 认领 引用 被引量：2
6
作者 Sitaramanjaneya Mouli Thalluri Jhonatan Rodriguez-Pereira +7 位作者 Jan Michalicka Eva Kolíbalová Ludek Hromadko Stanislav Slang Miloslav Pouzar Hanna Sopha Raul Zazpe Jan M.Macak 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2025年第3期191-198,共8页
Synergistic interplays involving multiple active centers originating from TiO2 nanotube layers(TNT)and ruthenium(Ru)species comprising of both single atoms(SAs)and nanoparticles(NPs)augment the alkaline hydrogen evolu... Synergistic interplays involving multiple active centers originating from TiO2 nanotube layers(TNT)and ruthenium(Ru)species comprising of both single atoms(SAs)and nanoparticles(NPs)augment the alkaline hydrogen evolution reaction(HER)by enhancing Volmer kinetics from rapid water dissociation and improving Tafel kinetics from efficient H*desorption.Atomic layer deposition of Ru with 50 process cycles results in a mixture of Ru SAs and 2.8-0.4 nm NPs present on TNT layers,and it emerges with the highest HER activity among all the electrodes synthesized.A detailed study of the Ti and Ru species using different high-resolution techniques confirmed the presence of Ti3+states and the coexistence of Ru SAs and NPs.With insights from literature,the role of Ti3+,appropriate work functions of TNT layers and Ru,and the synergistic effect of Ru SAs and Ru NPs in improving the performance of alkaline HER were elaborated and justified.The aforementioned characteristics led to a remarkable performance by having 9mV onset potentials and 33 mV dec-1 of Tafel slopes and a higher turnover frequency of 1.72 H2 s-1 at 30 mV.Besides,a notable stability from 28 h staircase chronopotentiometric measurements for TNT@Ru surpasses TNT@Pt in comparison. 展开更多
关键词 alkaline hydrogen evolution reaction ruthenium nanoparticles ruthenium single atoms TiO2 nanotube layers water dissociation
暂未订购 下载PDF
TiO_2-coated SnO_2 hollow spheres as anode materials for lithium ion batteries 认领 引用 被引量：6
7
作者 YI Jin LI Xiaoping +4 位作者 HU Shejun LI Weishan ZENG Ronghua FU Zhao CHEN Lang 《Rare Metals》 SCIE EI CAS CSCD 2011年第6期589-594,共6页
TiO2-coated SnO2 （TCS） hollow spheres, which are new anode materials for lithium ion （Li-ion） batteries, were prepared and characterized with X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transm... TiO2-coated SnO2 （TCS） hollow spheres, which are new anode materials for lithium ion （Li-ion） batteries, were prepared and characterized with X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, cyclic voltammetry （CV）, and galvanostatic charge/discharge tests. The results obtained from XRD, SEM, and TEM show that TiO2 can be uniforrrdy coated on the surface of SnO2 hollow spheres with the assistance of anionic surfactant. The cyclic voltammograms indicate that both TiO2 and SnO2 exhibit the activity for Li-ion storage. The charge/discharge tests show that the prepared TCS hollow spheres have a higher reversible coulomb efficiency and a better cycling stability than the uncoated SnO2 hollow spheres. 展开更多
关键词 TiO2-coated SnO2 hollow spheres anode lithium ion batteries
暂未订购 下载PDF
Photocatalytic activity and kinetics for acid yellow degradation over surface composites of TiO_2-coated activated carbon under different photocatalytic conditions 认领 引用 被引量：4
8
作者 曾孟雄 李佑稷 +2 位作者 马明远 陈伟 李雷勇 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第4期1019-1027,共9页
TiO2-coated activated carbon surface （TAs） composites were prepared by a sol-gel method with supercritical pretreatment. The photocatalytic degradation of acid yellow （AY） was investigated under UV radiation to es... TiO2-coated activated carbon surface （TAs） composites were prepared by a sol-gel method with supercritical pretreatment. The photocatalytic degradation of acid yellow （AY） was investigated under UV radiation to estimate activity of catalysts and determine the kinetics. And the effects of parameters including the initial concentration of AY, light intensity and TiO2 content in catalysts were examined. The results indicate that TAs has a higher efficiency in decomposition of AY than P25, pure TiO2 particles as well as the mixture of TiO2 powder and active carbon. The photocatalytic degradation rate is found to follow the pseudo-first order kinetics with respect to the AY concentration. The new kinetic model fairly resembles the classic Langmuir-Hinshelwood equation, and the rate constant is proportional to the square root of the light intensity in a wide range. However, its absorption performance depends on the surface areas of catalysts. The model fits quite well with the experimental data and elucidates phenomena about the effects of the TiO2 content in TAs on the degradation rate. 展开更多
关键词 photocatalysis TiO2-coated activated carbon acid yellow composite catalyst
暂未订购 下载PDF
三维TiO2/石墨烯气凝胶的自组装制备及其电容性能 认领 引用 被引量：1
9
作者 王艳坤 张建民 王一帆 《化工新型材料》 CAS CSCD 北大核心 2025年第12期96-102,115,共7页
将氧化石墨烯纳米片与Ti(OH)4纳米颗粒通过溶胶静电自组装,然后水热还原和真空冷冻干燥处理制备了三维分层结构的TiO2/还原氧化石墨烯气凝胶(TGAs)。通过X射线衍射、热重、傅里叶变换红外光谱、拉曼光谱、X射线光电子能谱、氮气吸附... 将氧化石墨烯纳米片与Ti(OH)4纳米颗粒通过溶胶静电自组装,然后水热还原和真空冷冻干燥处理制备了三维分层结构的TiO2/还原氧化石墨烯气凝胶(TGAs)。通过X射线衍射、热重、傅里叶变换红外光谱、拉曼光谱、X射线光电子能谱、氮气吸附脱附实验、场发射扫描电镜和透射电镜对其微观结构、组成和形貌进行了表征。采用循环伏安、恒流充放电、电化学阻抗谱和循环稳定性等电化学方法对其超级电容性能进行了评估。结构分析显示TGAs呈现典型的三维分级多孔结构及具有高比表面积(287.4m2/g)。在1mol/L Na2SO4电解液中,该材料在扫速为5mV/s时表现出高达268.3F/g的比电容。此外,该材料还表现出优异的循环稳定性,经3000次循环后比电容保持率仍保持在93%左右,表明其在高性能超级电容器电极材料方面具有良好的应用前景。 展开更多
关键词 TiO 2 石墨烯 气凝胶 静电自组装 超级电容器
暂未订购 下载PDF
包覆TiO2保护层抑制磷化镍钴在水中腐蚀 认领 引用 被引量：1
10
作者 杨博 吕功煊 马建泰 《无机化学学报》 SCIE CAS CSCD 北大核心 2025年第2期365-384,共20页
本工作研究了镍钴双金属磷化物(Ni-Co-P)在水溶液中的稳定性。结果显示,Ni-Co-P能与H2O反应,发生自腐蚀生成Ni2+、Co2+和PO43-离子,同时产生H2。Ni-Co-P与H2O的自腐蚀反应速率受到镍钴比例影响,Ni-Co-P中的Co含量升高,... 本工作研究了镍钴双金属磷化物(Ni-Co-P)在水溶液中的稳定性。结果显示,Ni-Co-P能与H2O反应,发生自腐蚀生成Ni2+、Co2+和PO43-离子,同时产生H2。Ni-Co-P与H2O的自腐蚀反应速率受到镍钴比例影响,Ni-Co-P中的Co含量升高,其在水中的腐蚀速率降低。详细研究了镍、钴投料比(nNiCo)为1∶2制备的Ni-Co-P在水中的腐蚀行为,其在水中的腐蚀速率与溶液pH值、氧气含量、光照、温度等因素有关。为了抑制Ni-Co-P(nNiCo=1/2)在水溶液中的腐蚀,在其表面包裹一层惰性TiO2保护层,这层TiO2保护层能有效减缓Ni-Co-P在水中的腐蚀,增强其稳定性。 展开更多
关键词 双金属磷化物 水溶液 稳定性 TiO2保护层
暂未订购 下载PDF
ZnO Spin-Coating of TiO2Photo-Electrodes to Enhance the Efficiency of Associated Dye-Sensitized Solar Cells 认领 引用
11
作者 Fahd Al-Juaid Amar Merazga +1 位作者 Fouad Abdel-Wahab Mohamed Al-Amoudi 《World Journal of Condensed Matter Physics》 CAS 2012年第4期192-196,共5页
Dye-sensitized solar cells (DSSCs) with ZnO spin-coated TiO2 photo-electrodes are compared to DSSC with a bare TiO2 photo-electrode. It is demonstrated that the deposited ZnO of controlled amount, by varying the precu... Dye-sensitized solar cells (DSSCs) with ZnO spin-coated TiO2 photo-electrodes are compared to DSSC with a bare TiO2 photo-electrode. It is demonstrated that the deposited ZnO of controlled amount, by varying the precursor concentration in the coating sol, can indeed enhance the performance of the DSSC. The measured power conversion efficiency shows a maximum around the precursor concentration 0.1 M and falls down sharply to 0% beyond this point. The results are interpreted on the basis of two competing factors: At ZnO concentrations less than 0.1 M, the formation of an energy barrier increases the photocurrent by reducing the rate of interfacial back-recombination. At ZnO concentrations greater than 0.1 M, the screening of the TiO2 film by thicker ZnO layers decreases the photocurrent through the reduction of TiO2 dye-adsorption efficiency. 展开更多
关键词 TiO2 Photo-Electrodes ZnO Sol-Gel Spin-Coating Dye-Sensitized Solar Cells Power Conversion Efficiency
暂未订购 下载PDF
Surface Anti-bacterial Adhesion Characteristics of TiO_2-coated PMMA 认领 引用 被引量：1
12
作者 苏文悦 王柿超 +3 位作者 吴棱 王绪绪 刘平 付贤智 《Chinese Journal of Structural Chemistry》 SCIE CAS 2009年第11期1497-1502,共6页
The anti-bacterial adhesion properties of TiO2-coated polymethyl methacrylate （PMMA） surfaces are investigated systematically. In detail, the adhesion of S. aureus （gram positive） and E. coli （gram negative） to ... The anti-bacterial adhesion properties of TiO2-coated polymethyl methacrylate （PMMA） surfaces are investigated systematically. In detail, the adhesion of S. aureus （gram positive） and E. coli （gram negative） to TiO2-coated and uncoated PMMA surfaces are performed by the plate counting method. Afterwards, the adhesion free energy of bacteria on both supporting materials is quantified using the thermodynamic approach of Lifshitz van der Waals and acid/base interactions. The superior anti-adhesion capability of TiO2-coated PMMA is demonstrated when compared to native PMMA, both experimentally and theoretically. 展开更多
关键词 bacterial adhesion adhesion free energy TiO2-coated PMMA anti-adhesive property
暂未订购 下载PDF
Porous TiO2-coated Magnetic Core-Shell Nanocomposites:Preparation and Enhanced Photocatalytic Activity 认领 引用 被引量：11
13
作者 刘鸿飞 季生福 +2 位作者 郑园园 李明 杨浩 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第5期569-576,共8页
The core-shell structured TiO2/SiO2 @Fe3O4 photocatalysts were prepared using Fe3O4 as magnetic core,tetraethoxysilane（TEOS） as silica source and tetrabutyl titanate（TBOT） as titanium sources.The as-obtained struc... The core-shell structured TiO2/SiO2 @Fe3O4 photocatalysts were prepared using Fe3O4 as magnetic core,tetraethoxysilane（TEOS） as silica source and tetrabutyl titanate（TBOT） as titanium sources.The as-obtained structure was composed of a SiO2@Fe3O4 core and a porous TiO2 shell.The diameter of SiO2@Fe3O4 core was about 205 nm with thickness of porous TiO2 of about 5-6 nm.The 9%TiO2/6%SiO2@Fe3O4 microspheres possess the highest BET surface area and the BJH pore volume,which are 373.5 m2.g-1 and 0.28 cm3.g-1,respectively.The 9%TiO2/6%SiO2@Fe3O4 photocatalyst exhibited an excellent performance for the degradation of methyl orange and methylene blue dyes.Two different dyes were completely decolorized in 60 min under UV irradiation.The photocatalytic activity and the amount of catalyst were almost not decrease after recycling for 6 times by using external magnetic field. 展开更多
关键词 photocatalyst magnetic microspheres porous TiO2 dyestuff degradation
暂未订购 下载PDF
Synthesis of Hierarchical SnO2 Nanowire–TiO2 Nanorod Brushes Anchored to Commercially Available FTO-coated Glass Substrates 认领 引用 被引量：1
14
作者 Derek R.Miller Sheikh A.Akbar Pat A.Morris 《Nano-Micro Letters》 SCIE EI CAS 2017年第3期93-100,共8页
Growth of single-crystal Sn O_2 nanowires using a fluorine-doped Sn O_2(FTO) thin film as both the source and substrate is demonstrated for the first time at relatively low temperature(580 °C) which preserves the... Growth of single-crystal Sn O_2 nanowires using a fluorine-doped Sn O_2(FTO) thin film as both the source and substrate is demonstrated for the first time at relatively low temperature(580 °C) which preserves the integrity of the underlying glass support and improves scalability to devices. Furthermore, a microwave hydrothermal process is shown to grow Ti O_2 nanorods on these nanowires to create a hierarchical nanoheterostructure that will lead to efficient photogenerated charge carrier separation and rapid transport of electrons to the substrate. This process simplifies nanowire growth by using commercially available and widely used FTO substrates without the need for an additional upstream Sn source and can be used as a high surface area host structure to many other hierarchical structures. 展开更多
关键词 SnO2 Nanowire Fluorine-doped SnO2（FTO） Vapor–liquid–solid(VLS) TiO2 Nanorod brush
暂未订购 下载PDF
Preparation of a novel composite electrode based on N-doped TiO_2-coated Na Y zeolite membrane and its photoelectrocatalytic performance 认领 引用 被引量：4
15
作者 Zhi-Lin Cheng Shuai Han 《Chinese Chemical Letters》 SCIE CAS CSCD 2016年第3期467-470,共4页
For the first time the preparation of the N-doped TiO2-coated NaY zeolite membrane（N-doped TiO2/NaY zeolite membrane） as an electrode material for photoelectrocatalysis has been achieved and reported.The XRD, SEM, U... For the first time the preparation of the N-doped TiO2-coated NaY zeolite membrane（N-doped TiO2/NaY zeolite membrane） as an electrode material for photoelectrocatalysis has been achieved and reported.The XRD, SEM, UV–vis and XPS techniques were used to characterize the structure of the N-doped TiO2/NaY zeolite membrane. The results verified that the surface of the N-doped TiO2/NaY zeolite membrane was coated by TiO2 nanoparticles of ca. 20 nm size and exhibited a distinct red-shift in the UV–vis spectra compared to N-doped TiO2. The photoelectrocatalysis performance of the N-doped TiO2/NaY zeolite membrane electrode was evaluated by phenol degradation. The results revealed it is a promising novel electrode material for application of photoelectrocatalysis in the removal of organic contaminants in waste water. 展开更多
关键词 Zeolite membrane Nanocomposites Photoelectrocatalysis NaY TiO2
暂未订购 下载PDF
液相法制备TiO2薄膜光阳极及其光电化学阴极保护性能 认领 引用
16
作者 姚权桐 胡素影 +3 位作者 王志有 程俊霞 王翠苹 冯云会 《辽宁科技大学学报》 CAS 2025年第3期177-184,203,共8页
为了研究不同相态TiO2薄膜的光电化学阴极保护性能,本文通过在不同温度下焙烧TiO2前驱体液态薄膜,获得锐钛矿和金红石两种相态TiO2薄膜,并系统对比两种相态薄膜的光电化学阴极保护性能。实验结果表明,锐钛矿相TiO2薄膜在紫... 为了研究不同相态TiO2薄膜的光电化学阴极保护性能,本文通过在不同温度下焙烧TiO2前驱体液态薄膜,获得锐钛矿和金红石两种相态TiO2薄膜,并系统对比两种相态薄膜的光电化学阴极保护性能。实验结果表明,锐钛矿相TiO2薄膜在紫外光谱区和可见光谱区的吸收能力均优于金红石相TiO2薄膜,且具有更低的载流子复合率。在白光辐照下,锐钛矿相TiO2薄膜可使304不锈钢开路电位负移至-0.95 V,金红石相TiO2薄膜可使开路电位负移至-0.75 V,为锐钛矿相TiO2薄膜的76%。锐钛矿相TiO2薄膜产生的光电流密度约为0.13 mA/cm2,金红石相TiO2薄膜产生的光电流密度约为0.10 mA/cm2,为锐钛矿相TiO2薄膜的76.9%。 展开更多
关键词 TiO2光阳极 液相法 锐钛矿相 金红石相 光电化学阴极保护
暂未订购 下载PDF
Ca2+掺杂对Na0.5Bi0.5TiO3氧离子导体性能的影响 认领 引用
17
作者 王伟国 薛瑜璐 《延安大学学报（自然科学版）》 2025年第2期98-102,共5页
提高固体电解质材料的离子电导率,对于降低固体氧化物燃料电池的运行温度、延长其使用寿命等方面具有重要的意义。采用固相反应法制备了钙钛矿结构的Ca2+掺杂的Na0.5CaxBi0.5-xTiO3氧离子导体,系统研究了Ca2+掺杂对Na... 提高固体电解质材料的离子电导率,对于降低固体氧化物燃料电池的运行温度、延长其使用寿命等方面具有重要的意义。采用固相反应法制备了钙钛矿结构的Ca2+掺杂的Na0.5CaxBi0.5-xTiO3氧离子导体,系统研究了Ca2+掺杂对Na0.5Bi0.5TiO3材料电学性能与氧离子输运的影响。结果表明,Na0.5CaxBi0.5-xTiO3材料的晶粒电导率随Ca2+掺杂含量提高呈现出先增加后减小的规律。当Ca2+掺杂含量为6 mol%时,Na0.5CaxBi0.5-xTiO3材料的晶粒电导率达到了最大值,其晶粒电导率在573 K时可达2.22×10-4 S/cm,高于母相Na0.5Bi0.5TiO3材料将近一个数量级。当Ca2+掺杂含量低于6 mol%时,随Ca2+掺杂含量的增加,氧空位浓度增大且能动性增强,导致了导体Na0.5CaxBi0.5-xTiO3(x=0,0.02,0.04,0.06)电导率的提升。当Ca2+掺杂含量高于6 mol%时,形成的缺陷对会造成Na0.5Bi0.5TiO3材料中氧空位有效浓度和能动性的下降,进而导致了材料晶粒电导率的下降。该研究可为Na0.5Bi0.5TiO3材料电化学性能优化提供理论参考。 展开更多
关键词 氧离子导体 钙钛矿 Ca2+掺杂 Na0.5Bi0.5TiO 弛豫
暂未订购 下载PDF
Structure Evolution and Electrochemical Performance of Al_2O_3-coated LiNi0.4Co0.2Mn0.4O_2 During Charge-discharge Cycling 认领 引用
18
作者 LIU Hao-han ZHANG Jian +3 位作者 LOU Yu-wan YANG Chuan-zheng XIE Xiao-hua XIA Bao-jia 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2012年第4期686-690,共5页
Several lithium-ion batteries of 18650-type were assembled with pristine or Al2O3-coated LiNi0.4Co0.2Mn0.4O2（NCM） as cathode material and mesocarbon microbeads（MCMB） as anode material.The cycling performance of th... Several lithium-ion batteries of 18650-type were assembled with pristine or Al2O3-coated LiNi0.4Co0.2Mn0.4O2（NCM） as cathode material and mesocarbon microbeads（MCMB） as anode material.The cycling performance of the batteries was examined under 25 °C at a 2C rate within a potential range of 2.75―4.20 V.The changes of the crystal structure,the lattice parameter,the mean crystallite size,and the mean micro-strain of pristine NCM and Al2O3-coated NCM during the charge-discharge cycling were determined by X-ray diffraction（XRD）.The results indicate that the bulk structure of Al2O3-coated NCM is more stable than that of pristine NCM,which leads to the better cycling performance of Al2O3-coated NCM compared to that of pristine NCM. 展开更多
关键词 LiNi0.4Co0.2Mn0.4O2 Al2O3-coated Cycling performance Bulk structure
暂未订购 下载PDF
纳米TiO2加入量对镁钙砂性能的影响 认领 引用 被引量：2
19
作者 臧伟楠 栾舰 +2 位作者 王春艳 李佳 韩昊鹏 《耐火材料》 CAS 北大核心 2025年第1期45-49,共5页
为了改善镁钙材料的抗水化性能并进一步提高其他性能,以白云石粉和轻烧镁粉为主要原料,外加纳米TiO2,以酚醛树脂为结合剂,在100 MPa下成型,经1 650℃煅烧3 h制成镁钙砂试样,研究了TiO2外加量(外加质量分数分别为0、2%、4%、6%和8%... 为了改善镁钙材料的抗水化性能并进一步提高其他性能,以白云石粉和轻烧镁粉为主要原料,外加纳米TiO2,以酚醛树脂为结合剂,在100 MPa下成型,经1 650℃煅烧3 h制成镁钙砂试样,研究了TiO2外加量(外加质量分数分别为0、2%、4%、6%和8%)对其性能的影响。结果表明:纳米TiO2的引入可使材料内产生固溶体,促进晶粒长大,同时材料内会有新相CaTiO3和Ca4Ti3O10生成,提高颗粒间结合程度,但过量的新相生成会阻碍材料内气体排出,影响烧结过程。随着纳米TiO2外加量的增加,试样中CaTiO3和Ca4Ti3O10的含量增加,体积密度逐渐降低,显气孔率逐渐增大,常温抗折强度、常温耐压强度和抗水化性能以及热震后的常温抗折强度先增大后减小。当纳米TiO2外加量为2%(w)时,试样的强度、抗热震性和抗水化性能最高。 展开更多
关键词 镁钙材料 纳米TiO2 力学性能 抗水化性
暂未订购 下载PDF
Electro-Optics and Band Gap Energies of Nanosilver-Coated TiO2 Nanotubes on Titanium Metal 认领 引用
20
作者 Ugursoy Olgun Mustafa Gülfen +1 位作者 Fatih Ustel Hale Arslan 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2018年第2期153-163,共11页
TiO2 nanotubes on Ti metal surface were prepared by the electrochemical anodization method. Then, nanosilver was deposited onto the nanotubes by the electroless dip coating and the anodization. The obtained TiO2 nanot... TiO2 nanotubes on Ti metal surface were prepared by the electrochemical anodization method. Then, nanosilver was deposited onto the nanotubes by the electroless dip coating and the anodization. The obtained TiO2 nanotubes were examined by using scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, cyclic voltammetry, and UV–Vis. The electrochemical band gap（Eg^CV） of the nanosilver-coated TiO2 nanotubes prepared by the anodization was found as 1.54 eV. Using the UV–Vis measurements, the optical band gap energy（Eg^op.） was calculated as 1.51 eV for the Ag/TiO2 nanotubes obtained by electroless dip coating. The electrical conductivity of the TiO2 nanotubes also increased from 3.0 × 10^-4 to 34.7 S/cm after nano Ag deposition by the anodization method.These Ag/TiO2 nanotubes with low band gap and high electrical conductivity are desirable for the applications in electronics, Li-ion batteries, and solar cells. 展开更多
关键词 Electrochemical anodization TiO2 nanotubes Nano Ag deposition Band gap energy Electrical conductivity
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 250 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈