检索结果-内蒙古大学图书馆

International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Jie Ying Nan Jiang Wei Gen Li Lu Shengchun He Jie He Xiaoyu Yang Baolian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Laboratory of Inorganic Materials Chemistry University of Namur (FUNDP)

Noble-metal nanostructures have attracted considerable research interest in both fundamental studies and various practical applications because of their unique catalytic, electronic, photonic, and sensing properties. However, because of their high cost and limited reserves, it is urgent to reduce their required usage in such applications. Controlling the morphology of noble-metal nanostructures can provide a great opportunity to improve their catalytic properties and increase their activity based on their mass. Here, we report a convenient and effective wet-chemical strategy that produces uniform porous PtPd bimetallic nanostructures with perpendicular pore channels and ultrathin branches. It was demonstrated that the porous PtPd bimetallic nanostructures exhibited high activity for oxygen reduction reaction (ORR), where they outperformed the Pt-black catalyst and the state-of-the-art Pt/C catalyst on the basis of equivalent Pt mass. This high performance can be attributed to the high surface area and perpendicular dendritic structures in the porous PtPd bimetallic nanostructures that provide highly accessible surface active site, as well as maintain the structural integrity of the catalysts. Our approach provides a promising route to the development of next-generation catalysts with substantial reduction in noble-metal loading while retaining high ORR activity.

关键词： PtPd alloy, Porous nanostructures, Oxygen reduction reaction, catalysts

来源：评论

学校读者我要写书评

暂无评论

One-pot and Template-Free synthesis of Hollow Porous Cu2O Nano-spheres and Their Enhanced Performance in Lithium-Ion Batteries

One-pot and Template-Free Synthesis of Hollow Porous Cu2O Na...

引用

中国化学会第十七次全国电化学大会

作者： Dai-Song Chen Yu Li Hong-En Wang Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanHubei430070 State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhanHubei430070 Laboratory of Inorganic Materials Chemistry(CMI) The University of Namur(FUNDP)NamurBelgium

来源：评论

学校读者我要写书评

暂无评论

OXYGEN REDUCTION REACTION KINETICS ON THE PLATINUM ORDERED NANOARRAYS ELECTRODE

OXYGEN REDUCTION REACTION KINETICS ON THE PLATINUM ORDERED N...

引用

第五届世界氢能技术大会(WHTC2013)

作者： Feng Cheng Mu Pan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 PR China

Electrode performance depends largely on the microstructure,hence the Ordered Nanoarrays Electrode (ONAE) has been attracted more and more *** presentation aims to assess the benefit and disadvantage of the Pt Order Nanoarrays electrode (Pt-ONAE) in terms of oxygen reduction reaction (ORR).Therefore the ORR kinetic equation was formulated for both Pt-ONAE and traditional Pt/C *** structure parameters of the electrode such as thickness/porosities,surface area,and tortuosity factor are critical to the ORR kinetic.

关键词： PEMFC ordered nanoarrays electrode oxygen-reduction reaction

来源：评论

学校读者我要写书评

暂无评论

Composite coatings with in-situ Formation for Fe-Ni-Cr alloy as bipolar plate of PEMFC

Composite coatings with in-situ Formation for Fe-Ni-Cr alloy...

引用

第五届世界氢能技术大会(WHTC2013)

作者： Dongming Zhang Zaiyi Wang Kaikai Huang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070PR China

Fe-Ni-Cr alloy is a potential material as the bipolar plate for proton exchange membrane fuel cell (PEMFC).However,its interfacial contact resistance is too high and the corrosion resistance is too low to survive in the hostile environment.A novel method by preparing the composite coating layers by in-situ method is reported in this *** plate is first treated in acid solution,and then is heat treated in vacuum at low temperature,at last is treated by electrochemical method.

关键词： Metallic bipolar plate for PEMFC Corrosion resistance ICR, composite coatings in-situ Formation

来源：评论

学校读者我要写书评

暂无评论

synthesis and Self-Assembly of Core-shell Co@SiO2 Magnetic nanocomposites

Synthesis and Self-Assembly of Core-shell Co@SiO2 Magnetic n...

引用

International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Si-Ming Wu Nan Jiang Wei Geng Ru-Jin Cheng Jie Hu Jie Ying Sheng-Chun He Yong Wang Xiao-Yu Yang State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

In recent years, self-assembly nanoparticles into well-ordered structures possess quite important position in spectroscopy, magnetism, catalysis and biology. Among all of the nanoparticles, magnetic nanoparticles promises an unparalleled opportunity for self-assembly as they can be controlled to form directional arrangements according to the external magnetic fields. Herein we choose Cobalt nanoparticles whose diameter is within 10 nm. In this size they can show fabulous superparamagnetism, which means each nanoparticle is a small domain, when without an external field, the particles are disordered and show paramagnetic. However, when an external field is applied, to which the nanoparticles are controlled to arrange, and at this time they show ferromagnetic. What can’t be ignored is that it is difficult to achieve self-assembly process in smaller size of the nanoparticles due to easy aggregation. Taking this into consideration, core-shell nanostructures provide an effective vehicle to protect magnetic core and enhance their chemical stability. In this work, ordered self- assembly Co@SiO 2 nanocomposites are firstly reported by changing the external magnetic field. Cobalt nanoparticles as the magnetic cores were easily controlled to form varies arrangements, which means they can self- assembly into multi-scale regular patterned structures. Owing to strong external magnetic field, the ordered structured crystalline Co@SiO 2 composite with directional arrangements are successfully achieved by self-assembly. Moreover, by changing the magnetic field, the composite also forms 2D arrays and 3D structures. This nanocomposite can be applied as controlled targeted drug carriers which shows great potential in biological diagnosis and biomedical treatment. It is believed that this methodology of self-assembly can be extended to other similar core-shell nanocomposites with magnetic core and paves way to further applications in magnetism and biomedical researches.

关键词： self-assembly, nanoparticles, core-shell, magnetic.

来源：评论

学校读者我要写书评

暂无评论

synthesis and application of hierarchically porous materials induced by functional proteins in ion screening

Synthesis and application of hierarchically porous materials...

引用

International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Yong Wang Wei Geng Ru-Jin Cheng Nan Jiang Jie Hu Jie Ying Sheng-Chun He Si-Ming Wu Xiao-Yu Yang State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

Biomineralization is a widespread phenomenon in nature leading to the formation of a variety of solid inorganic structures by living organisms. And many chemists have long strived to mimic this nature’s critical tricks. Many studies have been focused on this field. These biomineralized materials are inorganic-organic hybrid composites formed by self-assembled processes under mild conditions, showing interesting properties, controlled hierarchical structures, and special function. Among the biomineralization, proteins are attractive for synthesis of the hybrid materials, due to its much milder reaction conditions, highly specific or multiple functions and many successful examples existing in nature. Here we chose a functional protein, C96 RIDC-1 4 , which has the ability to selectively bind metal irons, such as Zn 2+ . Because of its high surface area, high stability and the property of capillary effect, the hierarchically structured porous materials are one of the ideal materials for biomineralization. In the typical synthesis process of the macro-meso porous materials, the functional protein was used as the second kind of the templates to induce the formation of the hierarchically structured porous materials, besides the surfactant is a template. For the living of the protein, we change the reaction condition to be much milder, such as at or near neutral pH, choosing the special surfactant which is not harmful to the protein, and so on. We prepared the macro-meso porous materials into the monolithic column. And this monolithic column is porous structure with macropores and two sizes of the mesopores. With the obtained monolithic devices, we tested its adsorption amount of Zn 2+ to get the limit value, the efficiency of the adsorption using the Zn 2+ solution with very low concentration and different filter time. Those results show the potential application in purifying the water to obtain the pure water with less impurity ions, purifying the organic compound and dr

关键词： biomineralization, protein, macro-meso porous materials, monolithic column

来源：评论

学校读者我要写书评

暂无评论

Enhanced and suppressed effects of ionic liquid on the photocatalytic activity of TiO2

Enhanced and suppressed effects of ionic liquid on the photo...

引用

作者： Qi, Lifang Yu, Jiaguo Jaroniec, Mietek State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122# Wuhan 430070 China Department of Chemistry and Biochemistry Kent State University Kent OH 44242 United States

The effects of a room temperature ionic liquid, 1-butyl-3-methylimidazolium terafluoroborate ([Bmim]BF4), on the photocatalytic performance of Degussa P25 TiO2 were investigated. Also, the photocatalysis mechanism was systematically analyzed by conducting different reactive radical trapping experiments. The results showed that photogenerated electrons were the main reactive species involved in the photocatalytic degradation of methyl orange (MO), while •OH radicals and photogenerated holes played an important role in the photocatalytic decomposition of rhodamine B (RhB). The addition of ionic liquid (IL) could slightly enhance the photocatalytic degradation rate of MO because adsorption of [Bmim]+ ions on the TiO2 surface not only enhanced traping and transfer of photogenerated electrons, but also facilitated adsorption of negatively charged MO. On the contrary, IL suppressed the degradation rate of RhB because [Bmim]+ on the TiO2 surface not only hindered the access of positively charged RhB to TiO2, but also restricted the diffusion of positively charged holes to the TiO2/solution interface. © 2013 Springer Science+Business Media New York.

关键词： Titanium dioxide

来源：评论

学校读者我要写书评

暂无评论

Preparation of Mesoporous V 2 O 5 @TiO 2 Composites with Enhanced Photoactivity for Gaseous Benzene Degradation

引用

Physics Procedia 2013年 48卷 38-45页

作者： Chunxia Zhao Subo Feng Wen Chen Xiaoyu Li Yanbao Song Jinqiao Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 P.R.China

Mesoporous V 2 O 5 @TiO 2 composites were fabricated by an ultrasonic method with V 2 O 5 sol as the guest precursor. The prepared materials were characterized by powder X-ray diffraction, field emission-scanning electron microscopy, transmission electron microscope, X-ray photoelectron spectroscopy, UV-Vis spectroscopy and nitrogen sorption analysis. The results indicated that V 2 O 5 nanoparticles dispersed well on/into the porous structure of TiO 2 matrix. The composites presented typical IUPAC IV isotherms with type H 2 hysteresis loops, revealing the mesoporous structure. It was observed that V 2 O 5 loading led to red shift of the absorption edge to 540 nm and reduced the band gap < 3.0 eV. The V 2 O 5 @TiO 2 composites with V/Ti molar ratio of 0.1 exhibited outstanding degradation efficiency of gaseous benzene.

关键词： Mesoporous composites V2O5 TiO2 photoactivity benzene degradation

来源：评论

学校读者我要写书评

暂无评论

Angle-resolved photoemission spectroscopy study of HgBa2CuO4+δ

引用

Physical Review B 2014年第19期89卷 195141-195141页

作者： I. M. Vishik N. Barišić M. K. Chan Y. Li D. D. Xia G. Yu X. Zhao W. S. Lee W. Meevasana T. P. Devereaux M. Greven Z.-X. Shen Massachusetts Institute of Technology Department of Physics Cambridge Massachusetts 02139 USA University of Minnesota School of Physics and Astronomy Minneapolis Minnesota 55455 USA Institute of Solid State Physics Vienna University of Technology Vienna 1040 Austria Peking University International Center for Quantum Materials School of Physics Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 China Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park California 94025 USA Geballe Laboratory for Advanced Materials Departments of Physics and Applied Physics Stanford University Stanford California 94305 USA School of Physics Suranaree University of Technology Muang Nakhon Ratchasima 30000 Thailand

HgBa2CuO4+δ (Hg1201) has been shown to be a model cuprate for scattering, optical, and transport experiments, but angle-resolved photoemission spectroscopy (ARPES) data are still lacking owing to the absence of a charge-neutral cleavage plane. We report on progress in achieving the experimental conditions for which quasiparticles can be observed in the near-nodal region of the Fermi surface. The d-wave superconducting gap in near-optimally-doped Hg1201 is found to have a maximum of 39 meV. At low temperature, a kink is detected in the nodal dispersion at approximately 51 meV below the Fermi level, an energy that is different from other cuprates with comparable Tc. The superconducting gap, Fermi surface, and nodal band renormalization measured here provide a crucial momentum-space complement to other experimental probes.

关键词： PHOTOELECTRON spectroscopy SPECTROMETRY SPECTRUM analysis ELECTRON emission CONDENSED matter CONDENSED matter physics

来源：评论

学校读者我要写书评

暂无评论

Design and synthesis of kinked nanowire structures for nanoelectronic bioprobes

Design and synthesis of kinked nanowire structures for nanoe...

引用

Nanophotonics, Nanoelectronics and Nanosensor, N3 2013

作者： Xu, Lin Jiang, Zhe Qing, Quan Mai, Liqiang Zhang, Qingjie Lieber, Charles M. WUT-Harvard Joint Nano Key Laboratory State Key Laboratory of Advanced Technology for Materials Synthesis and Processing University of Technology Wuhan 430070 China Department of Chemistry and Chemical Biology Harvard University Cambridge MA 02138 United States School of Engineering and Applied Science Harvard University Cambridge MA 02138 United States

ISBN: (纸本)9781557529763

We present design and synthesis of diverse functional kinked nanowire structures for nanoelectronic bioprobes, including (1) U-shaped KNWs with a nanoFET at the tip of the "U," (2) V-shaped KNWs with series multi-nanoFETs along the arm and at the tip of the "V," and (3) Wshaped multiplexed KNWs integrating nanoFETs at the two tips of "W". © OSA 2013.

关键词： Nanoelectronics

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：