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advanced Optoelectronics for Energy and Environment, AOEE 2013

作者： Nadimicherla, Reddeppa Liu, Yueli Chen, Keqiang Chen, Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

The V2O5 nanotubes and PEG surfactant V2O5 nanotubes were synthesized using simple hydrothermal method. The morphology and microstructure of the samples were investigated by XRD, FTIR, SEM and TEM analysis. © OSA... 详细信息

ISBN: (纸本)9781557529763

关键词： Nanotubes

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The Activity Influence of Isopropyl Alcohol for Flat Plant Pt and Pt/C Electrode

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ECS Transactions 2014年第1期59卷

作者： Shuang Sun Mu Pan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan University Of Technology

Pt , as a precious metal, is an important component of fuel cell catalyst, however the impurities in polymer electrolyte membrane fuel cell(PEMFC) has a great influence on the electrochemical activity. This paper studies the electrochemical activity influence of isopropyl alcohol(IPA) on a flat plate Pt and Pt/C electrodes by means of cyclic voltammograms and oxygen reduction test methods, the influence of the research results show that the addition of isopropyl alcohol will not change the stripping potentials of hydrogen, but it will obviously block the absorption of proton at the Hads potentials,and the biggest oxidation current on the Pt/C electrode was larger than that on the flat plate Pt electrode;we also find that the present of IPA reduces the limit current density of the plate Pt electrode,thus further influence on the performance of the catalyst in PEMFC.

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Effect of ZnSe passivation layer on the photovoltaic properties of CuInS2 quantum dots sensitized solar cells

Effect of ZnSe passivation layer on the photovoltaic propert...

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advanced Optoelectronics for Energy and Environment, AOEE 2013

作者： Peng, Zhuoyin Liu, Yueli Zhao, Yinghan Shu, Wei Chen, Keqiang Chen, Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

ZnSe passivation layer onto the CuInS2 quantum dots sensitized solar cells was introduced by the SILAR method. The photovoltaic performance was enhanced and the resistance was lower than without passivation layer or w... 详细信息

ISBN: (纸本)9781557529763

关键词： Semiconductor quantum dots

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MoO2 and PANI/MoO2 nanocomposites as anode materials for lithium-ion batteries

MoO2 and PANI/MoO2 nanocomposites as anode materials for lit...

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advanced Optoelectronics for Energy and Environment, AOEE 2013

作者： Qi, Yanyuan Yang, Xue Chen, Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

ISBN: (纸本)9781557529763

MoO2 nanorods were synthesized by hydrothermal method using ethyl alcohol as reducing agent. The pristine MoO2 exhibited a reversible discharge capacity of 300 mAh·g-1 under the current density of 0.1 mA·cm-2. PANI/MoO2 nanocomposites were obtained and the electrochemical tests demonstrated that the hybrid exhibited enhanced discharge capacity of 530 mAh·g-1 as an anode material for lithium-ion batteries. © OSA 2013.

关键词： Nanocomposites

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Dielectric propertiies of the compositionally graded BaZr xTi2-xO5 thin films prepared by sol-gel method

Dielectric propertiies of the compositionally graded BaZr xT...

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12th International Symposium on Multiscale, Multifunctional and Functionally Graded materials, FGM 2012

作者： Gong, Yi Ping Guo, Dong Yun Wang, Chuan Bin Shen, Qiang Zhang, Lian Meng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing And School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

The downgraded and upgraded BaZrxTi2-xO5 (x=0, 0.01, 0.02, 0.03 and 0.04) films normal to Pt/Ti/SiO2/Si substrates were prepared by sol-gel method. The microstructure and dielectric properties of the compositionally graded BaZrxTi2-xO 5 films were investigated. The single-phase downgraded and upgraded films were obtained as the films were annealed at 900 °C for 30 min. The downgraded BaZrxTi2-xO5 film had dense surface, while there were pores in the surface of the upgraded BaZrxTi 2-xO5 film. The thicknesses of both upgraded and downgraded BaZrxTi2-xO5 films were about 500 nm. The values of permittivity (Εr) for the downgraded and upgraded BaZrxTi2-xO5 films were 84 and 100, respectively, at 1 MHz. © Published under licence by IOP Publishing Ltd.

关键词： Sol-gel process

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Water Distribution and Removal along the Flow Channel in Proton Exchange Membrane Fuel Cells

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Journal of Wuhan University of technology(materials Science) 2013年第2期28卷 243-248页

作者：丁刚强 TANG Heqing LUO Zhiping 涂正凯 PEI Houchang LIU Zhichun LIU Wei College of Chemistry and Chemical Engineering Huazhong University of Science and Technology Power Battery Division Wuhan Institute of Marine Electric Propulsion State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology College of Energy and Power Engineering Huazhong University of Science and Technology

Distribution expressions of total gas pressure and partial water vapor pressure along the channel direction were established based on lumped model by analyzing pressure loss in the channel and gas diffusion in the layer. The mechanism of droplet formation in the flow channel was also analyzed. Effects of the relative humidity, working temperature and stoichiometry on liquid water formation were discussed in detail. Moreover, the force equilibrium equation of the droplet in the flow channel was deduced, and the critical flow velocity for the water droplet removal was also addressed. The experimental results show that the threshold position of the liquid droplet is far from the inlet with the increase of temperature, and it decreases with the increase of the inlet total pressure. The critical flow velocity decreases with the increase of the radius and the working pressure.

关键词： proton exchange membrane fuel cells pressure loss water distribution water removal

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synthesis and applications of hierarchically porous catalysts

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Chinese Journal of Catalysis 2013年第1期34卷 22-47页

作者： Li, Xiaoyun Sun, Minghui Rooke, Joanna Claire Chen, Lihua Su, Bao-Lian State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China 61 rue de Bruxelles B-5000 Namur Belgium Department of Chemistry University of Cambridge Lensfield Road Cambridge CB2 1EW United Kingdom

Hierarchically porous materials that can be used as catalysts or catalyst supports have garnered much attention due to their enhanced mass transport and multiple functionalities. Hierarchically porous catalysts integrate at least two levels of porosity and present the advantages associated with each level of porosity, from selectivity to mass transport. For example, hierarchically porous zeolites offer an effective solution to the mass transport problem associated with conventional zeolites in catalyzed reactions, because they combine the catalytic features of micropores and the improved accessibility and increased molecular transport related to the addition of several porosities within a single body. This review thoroughly summarizes recent developments that have been made in the field of hierarchically porous catalysts, with the main focus on the synthesis strategies that are available as well as their application in catalysis. It is the intent of this work to stimulate intuition into the optimal design of related hierarchically porous catalysts with desired characteristics. © 2013 Dalian Institute of Chemical Physics, the Chinese Academy of Sciences.

关键词： Porosity

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SC-IrO2NR-carbon hybrid: A catalyst with high electrochemical stability for oxygen reduction

SC-IrO2NR-carbon hybrid: A catalyst with high electrochemica...

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作者： Wang, Guangjin Cheng, Feng Yu, Yi Liang, Cong Xu, Tian Pan, Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Hubei Provincial Key Laboratory of Fuel Cell Wuhan 430070 China

The enhanced electrochemical stability of the synthesized hybrid catalyst has been demonstrated by the introduction of the synergistic effect between carbon powder additive and the prepared catalyst. Single crystal IrO2 nanorod (SC-IrO2NR) catalyst was prepared by a sol-gel method. The structure and performance of the catalyst sample were characterized by X-ray diffraction spectroscopy (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), rotating disk electrode (RDE) and cyclic voltammetry (CV) measurements. XRD patterns and TEM images indicate that the catalyst sample has a rutile IrO2 single crystal nanorod structure. The onset potential for oxygen reduction reaction (ORR) of the SC-IrO2NR-carbon hybrid catalyst specimen is 0.75 V (vs. RHE) in RDE measurement. CV and RDE test results show that the SC-IrO2NR-carbon hybrid catalyst has a better electrochemical stability in comparison with the commercial Pt/C catalyst, with attenuation ratios of 17.67% and 44.60% for the SC-IrO 2NR-carbon hybrid catalyst and the commercial Pt/C catalyst after 1500 cycles, respectively. Therefore, in terms of stability, the SC-IrO 2NR-carbon hybrid catalyst has a promising potential in the application of the proton exchange membrane fuel cell. © 2012 Science China Press and Springer-Verlag Berlin Heidelberg.

关键词： Carbon

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

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

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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.

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

Synthesis and application of hierarchically porous materials...

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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

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