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Enhanced photoelectrocatalytic performance of SnO2/TiO 2 rutile composite films

Journal of Materials Chemistry C 2013年第36期1卷 10727-10735页

作者： Yu, Jiaguo Wang, Ying Xiao, Wei State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Environmental Engineering School of Resource and Environmental Sciences Wuhan University Wuhan 430072 China

Ordered rutile TiO2 nanorods grown on transparent electro-conductive F-doped SnO2-coated (FTO) glass substrates were prepared by a simple hydrothermal method using tetrabutyl titanate as the precursor and then calcined at various temperatures. The prepared SnO 2/TiO2 composite film samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The photoelectrocatalytic (PEC) activity was evaluated by PEC degradation of methylene blue (MB) aqueous solutions under UV-LED light irradiation. The results showed that rutile TiO2 nanorods with diameters of ca. 300-700 nm and lengths of ca. 5 μm vertically grew on the FTO substrate. The resulting rutile TiO2 arrays exhibited excellent stability upon annealing in a temperature range of 300-500 °C. The sample calcined at 400 °C exhibited the highest PEC activity due to the combined effects of several factors including its one-dimensional morphology, high crystallinity, close contact between the TiO2 nanorods and SnO2 layers, SnO2/TiO2 n-n heterojunction and the applied external electrostatic field. The proposed enhanced PEC mechanism was further confirmed by the transient photocurrent response and electrochemical impedance spectroscopy (EIS) experiments. © 2013 The Royal Society of Chemistry.

关键词： Titanium dioxide

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A Facile synthesis of Ag Modified ZnO Nanocrystals with Enhanced Photocatalytic Activity

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Journal of Wuhan University of technology(Materials Science) 2012年第4期27卷 615-620页

作者：董艳玲王苹 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Department of Chemistry School of Science Wuhan University of Technology

Ag modified ZnO （Ag/ZnO） nanocrystals were prepared by a facile and low temperature wet chemical method. The phase structures, morphologies, and optical properties of the as-prepared samples were characterized by X-ray powder diffraction （XRD）, field-emission scanning electron microscopy （FESEM）, high-resolution transmission electron microscopy （HRTEM）, the Brumauer-Emmett-Teller （BET） surface area, UV-vis diffuse reflectance spectroscopy and photoluminescence （PL） spectra, respectively. The photocatalytic performance of Ag/ZnO with diffent Ag contents was measured with the degradation of methyl orange （MO） at room temperature under UV light irradiation. The experimental results indicated that the well-crystalline ZnO nanopaticles with a size of ca. 4.5 nm exhibited a high photocatalytic activity for the degradation of MO with the apparent rate constant （k） of 1.57 ×10-2 min-1, and the photocatalytic activities of ZnO were further enhanced by modification with silver. When the Ag loading was 3mol%, Ag/ZnO showed the highest photocatalytic acitivity with a k value of 5.452×10-2 min-1, which is 3.5 and 2.5 time more than that of ZnO and commercial P25, respectively.

关键词： ZnO Ag nanocrystal photocatalyst

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Tailoring the Porous Hierarchy and Dimension of Styrene-based Polymers by Spontaneous Inorganic Nano-Templating

Tailoring the Porous Hierarchy and Dimension of Styrene-base...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)(中国国际纳米科学和技术大会)

作者： Ge Tian Jie Hu Shengchun He Jie ying Siming Wu Yong Wang Xiaoyu Yang Baolian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology122 Luoshi Road430070WuhanChina Laboratory of Inorganic Materials Chemistry (CMI)The University of Namur (FUNDP)61rue de BruxellesB-5000 Namur (Belgium) State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of Technology122 Luoshi Road430070WuhanChina Laboratory of Inorganic Materials Chemistry (CMI) The University of Namur (FUNDP)61rue de BruxellesB-5000 Namur (Belgium)

Nanoporous polymers, especially these presenting multimodal or multiscale porosity are of considerable interest because of their present advantages:hydrophobic surface, flexibility, biocompatiblity, easy functional modification, well regularity and so *** traditional templating techniques have been extented to fabricate the hierarchical structured polymer, such as breath figure, colloidal crystal, supercritical fluids, and emulsion templating.

关键词： Styrene-based polymers metal alkoxide/alkyl spontaneous inorganic nano-template tailored porous structure

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Multimodal zeolite catalysts with hierarchically micro-meso-macroporous structure

Multimodal zeolite catalysts with hierarchically micro-meso-...

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1st Euro-Asia Zeolite Conference

作者： Li-Hua Chen Xiao-Yun Li Xiao-Yu Yang Bao-Lian Su State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyLuoshi Road 122 Laboratory of Inorganic Materials Chemistry(CMI) University of Namur(FUNDP)61rue de BruxellesB-5000 NamurBelgium.

Crystalline microporous zeolites with pore sizes typically at 0.4-1.5 nra are one of the most useful catalysts in industrial processes such as oil refining and organic synthesis owing to their strong catalytic performance,high thermal and hydrothermal stabilities,and well-defined micropores with excellent shape-selectivity in ***,one disadvantage of these zeolitic catalysts is that their pores are too small to be accessed by bulky reactants hindering their use in the fine chemical and petroleum processing industries. To overcome

关键词： Multimodal zeolite catalysts with hierarchically micro-meso-macroporous structure

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Preparation of high emissivity NiCr_2O_4 powders with a spinel structure by spray drying

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International Journal of Minerals,Metallurgy and Materials 2012年第2期19卷 173-178页

作者： Xu-dong Cheng Jie Min Zhen-qi Zhu Wei-ping Ye State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Technology Wuhan University of Technology Wuhan 430070 China

Spray-drying was used to produce the high emissivity NiCr2O4 powders with a spinel structure. Preliminary investigations focused on fabricating the high emissivity powders for infrared radiation coatings and finding the relationship between microstructure and emissivity. The NiCr2O4 powders were characterized for composition, microstructure, and infrared emissivity by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, infrared radiant instrument, and Fourier transform infrared spectra （FT-IR）. Thermogravimetry and differential thermal analysis show that the appropriate baking temperature for NiCr2O4 powder preparation is about 1200？C. The emissivity measurement and FT-IR spectra show that, because of the special spinel structure, the NiCr2O4 powders have a high emissivity about 0.91. Spray-drying is a suitable method to produce the high emissivity ceramic powders.

关键词： emissivity infrared radiation spray drying powders ceramic materials nickel compounds chromium compounds

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Resistive switching in Pt/CuxO/Si/Pt device

Resistive switching in Pt/CuxO/Si/Pt device

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中国物理学会2013年秋季学术会议

作者： Linlin Wei Dashan Shang Jirong Sun Zhigang Sun State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyWuhan 430070People''s Republic of China Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academic of SciencesBeijing 100190People''s Republic of China State Key Laboratory of Advanced Technology for Material Synthesis and ProcessingWuhan University of TechnologyWuhan 430070People''s Republic of China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academic of SciencesBeijing 100190People''s Republic of China

Nanoionics-based memristive devices(NIMD)have attracted intensive attention in recent years due to their potential application in resistive random access memory(RRAM)as well as reconfigurable logic devices [1,2].

关键词： memristive switching uniform-like switching ion migration nonvolatile memory

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Slow Photon Enhanced Photocatalytic Activity of ZnO Inverse Opal Film Synthesized by Sol-gel Method

Slow Photon Enhanced Photocatalytic Activity of ZnO Inverse ...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)(中国国际纳米科学和技术大会)

作者： Jing Liu Jun Jin Shao-zhuan Huang Li Wang Chao Wang Yu Li Bao-lian Su Laboratory of Inorganic Materials Chemistry (CMI) The University of Namur (FUNDP)61 rue de BruxellesB-5000 NamurBelgium Laboratory of Living Materials at State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology122 Luoshi Road430070WuhanHubeiChina Laboratory of Living Materials at State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of Technology122 Luoshi Road430070WuhanHubeiChina Department of Chemistry University of CambridgeLensfield RoadCambridge CB2 1EWUK

Recently, inverse opal structures, which have many potential applications in catalysts, separations, sensors, bioscience and photonics for their unique advantages such as highly ordered pore structure, large specific ... 详细信息

关键词： ZnO inverse opal film sol-gel method slow-photon photocatalysis

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Effect of Pt reduction method on Pt dispersion and visible-light photocatalytic H2-production performance of single crystal CdS nanowires

Effect of Pt reduction method on Pt dispersion and visible-l...

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第五届世界氢能技术大会(WHTC2013)

作者： Jiaguo Yu Jian Jin Gang Liu State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyLuoshi Road 122＃Wuhan 430070P.R. China National Center for Nanoscience and TechnologyBeijing 100190P. R. China

Single crystalline hexagonal CdS nanowires were prepared by a solvothermal method using ethylenediamine as ***/CdS nanocomposites were produced by different reduction methods and characterized by X-ray diffraction,transmission electron microscopy,high-resolution transmission electron microscopy,UV-visible spectroscopy,nitrogen absorption,pulse H2 chemisorption and X-ray photoelectron spectroscopy.

关键词：

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synthesis of NiCr_2O_4 spinel coatings with high emissivity by plasma spraying

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International Journal of Minerals,Metallurgy and Materials 2012年第3期19卷 266-270页

作者： Zhen-qi Zhu Xu-dong Cheng Wei-ping Ye Jie Min School of Materials Science and Technology Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Air plasma spraying （APS） was used to produce high emissivity coatings with a NiCr204 spinel structure. The relationship between the emissivity and the crystal structure was investigated. X-ray diffraction （XRD） analyses show that NiCr204 spinel has been fabri- cated with the space group Fd3m. Scanning electron microscope （SEM） photographs show that the coating consists of a laminated structure with homogeneous grains and high porosity because of the unique feature of plasma spraying. The emissivity measurement and Fourier transformation infrared radiation （FT-IR） spectra show that NiCr204 has a high emissivity of about 0.91 because of its special spinel structure APS is a suitable method to produce high emissivity coatings.

关键词： infrared radiation coatings plasma spraying emissivity crystal structure industrial ftLrnaces

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Single crystal CdS nanowires with high visible-light photocatalytic H 2-production performance

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Journal of Materials Chemistry C 2013年第36期1卷 10927-10934页

作者： Jin, Jian Yu, Jiaguo Liu, Gang Wong, Po Keung State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122# Wuhan 430070 China National Center for Nanoscience and Technology Beijing 100190 China School of Life Sciences Chinese University of Hong Kong Shatin NT Hong Kong

Single crystalline hexagonal CdS nanowires were prepared by a solvothermal method using ethylenediamine as a solvent. Pt/CdS nanocomposites were produced by different reduction methods and characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, UV-visible spectroscopy, nitrogen absorption, pulse H2 chemisorption and X-ray photoelectron spectroscopy. The photocatalytic performance of the as-synthesized Pt/CdS nanocomposites was evaluated towards H2 generation from a lactic acid aqueous solution under visible light (λ ≥ 420 nm). The sample prepared by the NaBH4 reduction method showed a higher photocatalytic H2-production activity than the sample prepared by the photo-reduction deposition method. A remarkable H 2-production rate of 1.49 mmol h-1 with a quantum efficiency (QE) of 61.7% was first achieved on the former with a small amount of Pt (0.3 wt%) as a co-catalyst. The photocatalytic activity difference of the samples is because reduction methods influence the size and dispersion of Pt nanoparticles (NPs), which further influence the photocatalytic H 2-production activity. The sample from the NaBH4 reduction method contains smaller Pt NPs (ca. 1-2 nm) and has higher Pt dispersion (72%), thus resulting in the higher H2-production activity. Further experiments showed that the one-dimensional nanostructure markedly enhanced the photocatalytic H2-production activity of CdS. After ball milling of the nanowires, which leads to destruction of their structure, the photocatalytic H2-production activity of CdS decreases by more than 30%. The underlying mechanism for the observed photocatalytic H2-production performance of Pt/CdS nanocomposites was discussed. © 2013 The Royal Society of Chemistry.

关键词： Nanocomposites

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