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Preparation of K2Ti4O9 nanowhiskers via stearic acid method

materials Research Innovations 2015年 19卷 340-344页

作者： Zhang, S. Wu, J. Ji, X.L. Yi, F. Hu, P.F. State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan430070 China Shool of Materials Science and Engineering Wuhan University of Technology 122 Luoshi Road Wuhan430070 China

K2Ti4O9 nanowhiskers were synthesised via stearic acid method by using potassium hydroxide (KOH) and tetrabutyl titanate (Ti(OC4H9)4) as raw materials. The effects of molar ratio of tetrabutyl titanate and KOH (RT/K), calcination temperature (TC) on composition, morphology of products have been investigated. RT/K showed a significant effect on length to diameter ratio (RL/D) of the nanowhiskers. K2Ti4O9 nanowhiskers with RL/D greater than 20 were prepared at RT/K = 1 and TC = 850°C. Reaction mechanism of K2Ti4O9 nanowhiskers also has been studied. © 2015 W. S. Maney & Son Ltd.

关键词： Titanium compounds

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Applications of hierarchically structured porous materials from energy storage and conversion, catalysis, photocatalysis, adsorption, separation, and sensing to biomedicine

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Chemical Society reviews 2016年第12期45卷 3479-563页

作者： Ming-Hui Sun Shao-Zhuan Huang Li-Hua Chen Yu Li Xiao-Yu Yang Zhong-Yong Yuan Bao-Lian Su State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122 Wuhan 430070 China. chenlihua@*** baoliansu@***. Collaborat Innovat. Ctr. Chem. Sci. & Engn. Tianjin Key Lab. Adv. Energy Mat. Chem. Minist. Educ. Coll. Chem. Nankai Univ. Tianjin 300071 China. State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122 Wuhan 430070 China. chenlihua@*** baoliansu@*** and Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium. bao-lian.su@unamur.be and Clare Hall University of Cambridge Cambridge CB2 1EW UK. bls26@cam.ac.uk.

Over the last decade, significant effort has been devoted to the applications of hierarchically structured porous materials owing to their outstanding properties such as high surface area, excellent accessibility to active sites, and enhanced mass transport and diffusion. The hierarchy of porosity, structural, morphological and component levels in these materials is key for their high performance in all kinds of applications. The introduction of hierarchical porosity into materials has led to a significant improvement in the performance of materials. Herein, recent progress in the applications of hierarchically structured porous materials from energy conversion and storage, catalysis, photocatalysis, adsorption, separation, and sensing to biomedicine is reviewed. Their potential future applications are also highlighted. We particularly dwell on the relationship between hierarchically porous structures and properties, with examples of each type of hierarchically structured porous material according to its chemical composition and physical characteristics. The present review aims to open up a new avenue to guide the readers to quickly obtain in-depth knowledge of applications of hierarchically porous materials and to have a good idea about selecting and designing suitable hierarchically porous materials for a specific application. In addition to focusing on the applications of hierarchically porous materials, this comprehensive review could stimulate researchers to synthesize new advanced hierarchically porous solids.

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Mechanical alloying and spark plasma sintering of CoCrFeNiMnAl high-entropy alloy

Mechanical alloying and spark plasma sintering of CoCrFeNiMn...

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作者： Wang, Chao Ji, Wei Fu, Zhengyi Department of Architecture and Material Engineering Hubei University of Education Wuhan430205 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

An equiatomic CoCrFeNiMnAl high-entropy alloy was synthesized by mechanical alloying, and alloying behaviors, microstructure and annealing behaviors were investigated. It was found that a solid solution with refined microstructure of 20 nm in grain size could be obtained after 30 h milling. As-milled powder transformed into a face-centered cubic phase above 500 °C. The as-milled powder was subsequently consolidated by spark plasma sintering at 800 °C, BCC phase and FCC phase coexisted in the consolidated HEA, which had excellent properties in Vickers hardness of 662 HV and compressive strength of 2142 MPa. © 2014 The Society of Powder technology Japan. Published by Elsevier B.V. and The Society of Powder technology Japan. All rights reserved.

关键词： Mechanical alloying

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Graphene-based composite photocatalyst for solar fuel production

Graphene-based composite photocatalyst for solar fuel produc...

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中国化学会第29届学术年会

作者： Jiaguo Yu State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

The production of solar fuels by solar energy conversion is considered to be one of major strategies for solving the global energy and environmental problems in the future. Photocatalytic water splitting for H2 production and CO2 reduction for methane formation have become important and promising methods for clean, economical, and renewal production of solar fuels by using solar light since Fujishima and Honda first reported the photoelectrochemical water splitting on a TiO2 electrode in 1972. Among various semiconductors, titania(TiO2) has attracted special attention because of its strong oxidizing and reduction power, cost effectiveness, lack of toxicity, and high photochemical corrosive resistance. Usually, the photocatalytic H2-production activity on TiO2 is significantly dependent on the type and amount of co-catalyst because bare TiO2 has poor photocatalytic H2-Production activity. It is well-known that the loading of Pt as a co-catalyst on TiO2 significantly enhances H2-production activity for photocatalytic water splitting in the presence of sacrificial reagents. However, Pt is a rare and expensive noble metal. Therefore, alternative co-catalysts based on non-precious metals and earth-abundant materials have been actively pursued. Graphene-based nanocpmposite photocatalysts have recently caused tremendous interest as a viable alternate to increase photocatalytic H2-production and CO2-reduction performance in converting solar energy into chemical energy. The use of graphene as cocatalyst and support to enhance the H2-production activity of photocatalysts has been confirmed due to its unique two-dimensional conjugated structure and electronic properties. In this talk, I will present our recent work on the design and fabrication of graphene-based nanocomposite photocatalytic materials for H2 production and CO2 reduction. The rational designs for high-performance photocatalytic materials using graphene-based materials are described. Our work also demonstrates gr

关键词： Graphene-based composite photocatalyst for solar fuel production

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Fabrication of W@Cu Composite Powders by Direct Electroless Plating Using a Dripping Method

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Journal of Wuhan University of technology(materials Science) 2013年第4期28卷 829-833页

作者：刘树龙 YU Kan 沈强 LI Meijuan CHEN Wenshu LUO Guoqiang ZHANG Lianmeng Sate Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Department of Physics Huaibei Normal University

A direct electroless copper （Cu） coating on tungsten powders method requiring no surface treatment or stabilizing agent and using glyoxylic acid （C2H203） as a reducing agent was reported. The effects of copper sulfate concentration and the pH of the plating solution on the properties of the prepared W@Cu composite powders were assessed. The content of Cu in the composite powders was controlled by adjusting the concentration of copper sulfate in the electroless plating solution. A uniform, dense, and consistent Cu coating was obtained under the established optimum conditions （flow rate of C2H203 = 5.01 mL/min, solution pH = 12.25 and reaction temperature 45.35℃） by using central composite design method. In addition, the crystalline Cu coating was evenly dispersed within the W@Cu composite powders and Cu element in the coating existed as Cu~. The formation mechanism for the W@Cu composite powders by electroless plating in the absence of surface treatment and stabilizing agent was also proposed.

关键词： dripping method electroless plating W@Cu composite powders characterization

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Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO_2 to solar fuel

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Science China materials 2014年第1期57卷 70-100页

作者：李鑫温九青刘敬祥方岳平余家国 State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology College of Science South China Agricultural University Department of Physics Faculty of Science King Abdulaziz University

The shortage of fossil fuels and the disastrous pollution of the environment have led to an increasing interest in artificial photosynthesis. The photocatalytic conversion of CO2 into solar fuel is believed to be one of the best methods to overcome both the energy crisis and environmental problems. It is of significant importance to efficiently manage the surface reactions and the photo-generated charge carriers to maximize the activity and selectivity of semiconductor photocatalysts for photoconversion of CO2 and H2 O to solar fuel. To date, a variety of strategies have been developed to boost their photocatalytic activity and selectivity for CO2 photoreduction. Based on the analysis of limited factors in improving the photocatalytic efficiency and selectivity, this review attempts to summarize these strategies and their corresponding design principles, including increased visible-light excitation, promoted charge transfer and separation, enhanced adsorption and activation of CO2, accelerated CO2 reduction kinetics and suppressed undesirable reaction. Furthermore, we not only provide a summary of the recent progress in the rational design and fabrication of highly active and selective photocatalysts for the photoreduction of CO2, but also offer some fundamental insights into designing highly efficient photocatalysts for water splitting or pollutant degradation.

关键词： CO2 二氧化碳光催化剂 Ti

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Impedance analysis of Nb2O5 doped BaTiO3-Na0.5Bi0.5TiO3 ceramics

Impedance analysis of Nb2O5 doped BaTiO3-Na0.5Bi0.5TiO3 cera...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Yue Sun Hanxing Liu Hua Hao Shujun Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Material Research Institute The Pennsylvania State University USA

BaTiO 3 -based MLCC materials were limited for high temperature applications (temperature range up to 200°C), due to their low Curie temperatures. The addition of Na 0.5 Bi 0.5 TiO 3 (NBT) component in BaTiO 3 (BT) based ceramics was found to increase the Curie temperature, without sacrificing the dielectric constant. The Curie temperature was reported to increase from 125°C to 156°C with addition up to 10mol%, making it possible to satisfy the X8R or X9R criterions. In addition, the small amount of Nb 2 O 5 dopant in the system leads to a diffused dielectric maxima and improved temperature stability. The NBT-BT with 2wt% Nb 2 O 5 addition was found to exhibit a core-shell structure, while maintaining the dielectric constant at about 2500. To analyze the electrical microstructure variation, the obtained impedance data was fitted by a 4RC equivalent circuit, corresponding to the core, shell, grain boundary, and ceramic/electrode interface regions. All the electrical properties, including the capacitance, activation energy, and conductivity could be well explained by using this equivalent circuit.

关键词： Niobium Ceramics Grain boundaries Dielectrics Impedance Temperature Conductivity

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Morphology Controlled synthesis and Characterization of Bi_2WO_6 Photocatalysts

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Journal of Wuhan University of technology(materials Science) 2013年第2期28卷 231-234页

作者：何金云王为民 ZHANG Linlang ZOU Zhengguang FU Zhengyi XU Zhe Sate Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Ministry of Education Guilin University of Technology Hubei Province Supervision and Testing Institute For Building Materials Product Quality

Nest-like and multilayered-disk-like Bi2WO6 photocatalysts were synthesized through a hydrothermal strategy using thiourea and acetic acid as complexing agents. The nest-like Bi2WO6 showed excellent visible-light-driven photocatalytic performance, and it could decompose rhodamine B（RhB） within 100 minutes. This excellent performance resulted from its special microstructure and the relatively large surface area.

关键词： semiconductors nanostructure hydrothermal synthesis bismuth tungstate visible-lightdriven photocatalyst

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HIERARCHICALLY POROUS STRUCTURED materialS AND THEIR ENHANCED CATALYTIC ACTIVE STABILITY

HIERARCHICALLY POROUS STRUCTURED MATERIALS AND THEIR ENHANCE...

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10th IUPAC International Conference on Novel materials and their synthesis NMS-X(IUPAC第十届新材料及其合成国际会议)

作者： A.YONG WANG B.WEI GENG C.RU-JIN CHENG D.NAN JIANG E.XIAO-YU YANG F.BAO-LIAN SU Laboratory of Inorganic Materials Chemistry University of Namur (FUNDP)61 Rue de BruxellesB-5 000 NamurBelgium State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyLuoshi Road 122430070 WuhanChina State Key Laboratory of Advanced Technology for Material Synthesis and ProcessingWuhan University of TechnologyLuoshi Road 122430070 WuhanChina

As a hot topic in recent years, hierarchically porous structured materials have received plenty of attentions and lots of work has been done on their synthesis. For their outstanding properties, hierarchically porous structured materials have attractively potential applications in catalysis, controlled release, biomedicine, separation science and energy. We have synthesized several micro-meso-macro hierarchically porous structured materials through different methods. Except for some general characteristics of porous structured materials, these materials possess some common superiorities, and the highlight is that they have highly interconnected network of well-defined macropores with uniform mesoporosity and zeolitic micro-channels which can lead to highly active sites, larger external surface areas and fast diffusion of species. We applied these hierarchically porous structured materials to catalysis by encapsulating active species into macropores, such as enzymes,metallic oxide nanoparticles and metallic ion, which exhibite high catalytic activity, long-term stability, and excellent recycling behaviour. Hierarchically porous structured materials applied to catalysis are obviously more attractive and promising than tradition catalysts. What's more, other advanced properties can be exploited in the design of magnetic devices, sensors, and biofuel cell etc. which are based on hierarchically porous structured materials.

关键词： micro-meso-macro porous materials catalyst long-term stability

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Preface photocatalytic materials for energy and environmental applications

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Applied Surface Science 2014年第1期319卷 1-1页

作者： Yu, Jiaguo Jaroniec, Mietek State Key Laboratory of Advanced Technology For Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122# Wuhan430070 China Department of Chemistry and Biochemistry KentState University KentOH44242 United States

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