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International Thermal Spray Conference and Exposition, ITSC 2016

作者： Zouab, Jun Yec, Weiping Donga, Shurong Niea, Zhen Cheng, Xudong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China College of Mechanical and Power Engineering China Three Gorges University Yichang443002 China School of Materials Science and Technology Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9781510844001

High emissivity coatings used in high temperature condition have attracted a great attention for its significant energy saving properties in the worldwide. In this study, we produced the high emissivity Ni-Cr oxide coatings with Ti02/TiB2 compounds on stainless steel substrate by spray granulation and atmospheric plasma spraying (APS) method. Compared to the TiB2-adding composite coatings(NCTB coatings), X-ray diffraction (XRD) analysis of the Ti02-adding composite coatings(NCTO coatings) showed remarkable increment in the content of Ti02. It was revealed that the particle size of the NCTO coatings was larger than the NCTB coatings by scanning electron microscope (SEM). The infrared emissivity of coatings were investigated by fourier transformation infrared radiation (FT-IR) at room temperature. The emissivity of NCTO coatings was higher than NCTB coatings on the band of 2.5-8 pm, similar on the waveband of 8-14 pm, and lower on the wavelength of 14-25 pm. The modified emissivity of NCTO coatings at 800°C is 0.9201, which is 4.3 percent higher than that of NCTB coatings. The results indicated that NCTO coatings were more suitable for high temperature application than NCTB coatings.

关键词： Titanium dioxide

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Study on Optical Properties of Complex Perovskite Ceramics

Study on Optical Properties of Complex Perovskite Ceramics

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2016中国国际功能材料大会(CIFM 2016)暨第九届中国功能材料及其应用学术会议(9th NCFMA)

作者： Jie Shen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of Technology

Compared to the glass and single crystal, transparent ceramics not only have high transparency and corrosion resistance, but also can work in extreme condition. High permittivity and low dielectric loss of the complex perovskite ceramics provide the application potential of a high refractive index material with good intrinsic transmittance. Furthermore, with outstanding structure tolerant, transparent complex perovskite ceramics can be a good matrix candidate for Re doped luminescent material to improve the quenching concentration. In this study, Sn doped Ba(MgNb)O（BMN） transparent ceramics were synthesized by a solid state reaction and investigated with using of first-principle method calculation. Additionally, Sm doped BMN luminescent ceramic was also synthesized and investigated. Sn doped BMN transparent ceramics were fabricated via the solid state reaction with using active powders and isostatic cool pressing. The transmittance of the Sn doped BMN transparent ceramic is 30–53% in the visible region, and its refractive index is 2.09–2.22 in the wavelength range of 400 to 1000 nm. The cut-on wavelength shifts with doping to the edge of the visible region（410 nm）, leading to effective ultraviolet absorption. The phase structure of Sn: BMN was determined by Rietveld refinement. Based on the structural analysis, the electronic structure and optical properties of the material were calculated, analyzed and predicted. The theoretical analysis results show that the band gap of Sn: BMN is gradually widening with the increasing of additive amount of Sn, the absorption edge being blue-shift, and the transparent area expanding, which are consistent with experimental results. Sm doped BMN luminescent ceramic were synthesized by the same method as Sn: BMN. Structural analysis shows that Sm enters the A-sites of BMN crystal structure. Sm:BMN ceramic shows obvious absorption peaks at 407 nm, 465 nm and 478 nm. The emission spectrum excited by 407 nm shows characteristic emission

关键词： Complex perovskite ceramics Transparent ceramics Luminescent ceramic Quenching concentration

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Cycling-Stable Cathodes: The Capturing of Ionized Oxygen in Sodium Vanadium Oxide Nanorods Cathodes under Operando Conditions (Adv. Funct. Mater. 36/2016)

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advanced Functional materials 2016年第36期26卷 6498-6498页

作者： Yan, Mengyu Zhao, Luzi Zhao, Kangning Wei, Qiulong An, Qinyou Zhang, Guobin Wei, Xiujuan Ren, Wenhao Mai, Liqiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology WuhanHubei430070 China

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Phase Transformation of Amorphous Calcium Carbonate to Single-Crystalline Aragonite with Macroscopic Layered Structure in the Presence of Egg White Protein and Zinc Ion

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Journal of Wuhan University of technology(materials Science) 2015年第1期30卷 65-70页

作者：曾辉 XIE Jingjing PING Hang WANG Menghu XIE Hao WANG Weimin 傅正义 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology School of Science Wuhan University of Technology

Highly oriented calcium carbonate lamellas are exquisite structure produced by biomineralization. Strategies mimicking nature have been developed to synthesize inorganic materials with excellent structures and optimal properties. In our strategy, egg white protein and zinc ion were employed in the solution to induce the crystallization of calcium carbonate, resulting in the macroscopic aragonite laminate with an average length of 1.5 mm, which was comprised of single-crystalline tablets. During the crystallization at initial stage, it was found that the particles displayed the characteristics of amorphous calcium carbonate, which was then transformed into the sophisticated structured aragonite through a multistage assembly process. The rebuilt nacre structure in vitro was achieved owing to the synergistic effects of egg white protein and zinc ion.

关键词： calcium carbonate ACC aragonite egg white protein zinc ion

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Walnut-like Porous Core/Shell TiO2 with Hybridized Phases Enabling Fast and Stable Lithium Storage

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ACS applied materials & interfaces 2017年第12期9卷 10652-10663页

作者： Yi Cai Hong-En Wang Xu Zhao Fei Huang Chao Wang Zhao Deng Yu Li Guozhong Cao Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei China. Department of Materials Science and Engineering University of Washington Seattle Washington 98195-2120 United States. Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium. Department of Chemistry and Clare Hall University of Cambridge Cambridge CB2 1EW U.K.

TiO is a promising and safe anode material for lithium ion batteries (LIBs). However, its practical application has been plagued by its poor rate capability and cycling properties. Herein, we successfully demonstrate a novel structured TiO anode with excellent rate capability and ultralong cycle life. The TiO material reported here shows a walnut-like porous core/shell structure with hybridized anatase/amorphous phases. The effective synergy of the unique walnut-like porous core/shell structure, the phase hybridization with nanoscale coherent heterointerfaces, and the presence of minor carbon species endows the TiO material with superior lithium storage properties in terms of high capacity (∼177 mA h g at 1 C, 1 C = 170 mA g), good rate capability (62 mA h g at 100 C), and excellent cycling stability (∼83 mA h g was retained over 10 000 cycles at 10 C with a capacity decay of 0.002% per cycle).

关键词： TiO2 amorphous anatase anode material electrochemical performance lithium ion battery porous core/shell structure titanate

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Anchoring ultrafine metallic and oxidized Pt nanoclusters on yolk-shell TiO 2 for unprecedentedly high photocatalytic hydrogen production

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Nano Energy 2017年 38卷 118-126页

作者： Jun Jin Chao Wang Xiao-Ning Ren Shao-Zhuan Huang Min Wu Li-Hua Chen Tawfique Hasan Bin-Jie Wang Yu Li Bao-Lian Su Laboratory of Living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei China Cambrige Graphene Centre University of Cambridge 9 JJ Thomson Avenue Cambridge CB3 0FA United Kingdom FEI Company Shanghai Nanoport 399 Shengxia Road 201210 Shanghai China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium Clare Hall University of Cambridge United Kingdom

We demonstrate an alkali modification process to produce highly dispersed ultrafine Pt nanoclusters with metallic Pt 0 and oxidized Pt 2+ species as co-catalyst anchored on nanosheet-constructed yolk-shell TiO 2 (NYTiO 2 -Pt) acting as light harvesting reactor for highly efficient photocatalytic H 2 production. Benefiting from the high surface area, highly dispersed ultrafine Pt nanoclusters (~0.6 nm) with Pt 0 and Pt 2+ species and special nanosheet-constructed yolk-shell structure, this novel light harvesting reactor exhibits excellent performance for photocatalytic H 2 production. The NYTiO 2 -Pt-0.5 (0.188 wt% Pt) demonstrates an unprecedentedly high H 2 evolution rate of 20.88 mmol h −1 g −1 with excellent photocatalytic stability, which is 87 times than that of NYTiO 2 -Pt-3.0 (0.24 mmol h −1 g −1 , 1.88 wt% Pt), and also much higher than those of other TiO 2 nanostructures with the same Pt content. Such H 2 evolution rate is the highest reported for photocatalytic H 2 production with such a low Pt content under simulated solar light. Our strategy here suggests that via alkali modifying the photocatalysts, we can not only enhance the H 2 production for solar energy conversion but also significantly decrease the noble metal content for cost saving.

关键词： Nanosheet-constructed yolk-shell TiO 2 Alkali modification Pt nanoclusters Pt 0 and Pt 2+ Photocatalytic H 2 production

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Probing the electrochemical behavior of {111} and {110} faceted hollow Cu2O microspheres for lithium storage

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RSC Advances 2016年第99期6卷 97129-97136页

作者： Yu, Wen-Bei Hu, Zhi-Yi Yi, Ming Huang, Shao-Zhuan Chen, Dai-Song Jin, Jun Li, Yu Van Tendeloo, G. Su, Bao-Lian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan Hubei430070 China University of Antwerp 171 Groenenborgerlaan AntwerpB-2020 Belgium University of Namur 61 rue de Bruxelles NamurB-5000 Belgium Department of Chemistry Clare Hall University of Cambridge CambridgeCB21 EW United Kingdom

Transition metal oxides with exposed highly active facets have become of increasing interest as anode materials for lithium ion batteries, because more dangling atoms exposed at the active surface facilitate the reaction between the transition metal oxides and lithium. In this work, we probed the electrochemical behavior of hollow Cu2O microspheres with {111} and {110} active facets on the polyhedron surface as anodes for lithium storage. Compared to commercial Cu2O nanoparticles, hollow Cu2O microspheres with {111} and {110} active facets show a rising specific capacity at 30 cycles which then decreases after 110 cycles during the cycling process. Via advanced electron microscopy characterization, we reveal that this phenomenon can be attributed to the highly active {111} and {110} facets with dangling "Cu" atoms facilitating the conversion reaction of Cu2O and Li, where part of the Cu2O is oxidized to CuO during the charging process. However, as the reaction proceeds, more and more formed Cu nanoparticles cannot be converted to Cu2O or CuO. This leads to a decrease of the specific capacity. We believe that our study here sheds some light on the progress of the electrochemical behavior of transition metal oxides with respect to their increased specific capacity and the subsequent decrease via a conversion reaction mechanism. These results will be helpful to optimize the design of transition metal oxide micro/nanostructures for high performance lithium storage. © 2016 The Royal Society of Chemistry.

关键词： Transition metal oxides

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Structure, dielectric properties and energy storage performance of barium strontium titanate thin films prepared by spin-coating technique

Structure, dielectric properties and energy storage performa...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Chunli Diao Hanxing Liu Hua Hao Minghe Cao Zhonghua Yao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan P.R. China

ISBN: (纸本)9781509018727

Ba 0.4 Sr 0.6 TiO 3 (BST) thin films were prepared by spin-coating technique and deposited on either Pt/TiO 2 /SiO 2 /Si (Pt/Si) substrate or silicon buffered by a lanthanum nickel oxide buffer layer (LNO/Si). X-ray diffraction and scanning electron microscopy showed that the BST films were crack free, compact and crystallized with a single perovskite structure. The effects of bottom electrodes on dielectric properties and energy storage performance of BST films were investigated. The results shows that the dielectric constant of BST/Pt film is a little higher than that of BST/LNO film, and the dielectric loss at 1 kHz of both films is very low, 0/ 00 . A butterfly loops with good dielectric tunability was observed in the capacitance-voltage (C-V) curve of BST/LNO film. The DC leakage current densities at 100kV/cm are ~9.3×10 -9 A/cm 2 and ~1.0×10 -8 A/cm 2 for BST/LNO and BST/Pt films, respectively. The P-E loops and energy storage performance of both films are similar. It was indicated that BST/LNO thin film can be applied as a cost-effective and environment-friendly capacitor for high-power energy storage.

关键词： Energy storage Films Substrates Capacitors Dielectric constant Electrodes

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Preparation and Microstructure of Porous ZrB_2 Ceramics Using Reactive Spark Plasma Sintering Method

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Journal of Wuhan University of technology(materials Science) 2015年第3期30卷 512-515页

作者：袁辉平李俊国 SHEN Qiang ZHANG Lianmeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Beijing Glass Research Institute

Zirconium oxide （ZrO：） and boron carbide （B4C） were added to ZrB2 raw powders to prepare ZrB2 porous ceramics by reactive spark plasma sintering （RSPS）. The reactions between ZrO2 and B,C which produce ZrB2 and gas （such as CO and B2O3） result in pore formation. X-Ray Diffraction results indicated that the products phase was ZrB2 and the reaction was completed after the RSPS process. The porosity could be controlled by changing the ratio of synthesized ZrB2 to raw ZrB2 powders. The porosity of porous ceramics with 20 wt% and 40 wt% synthsized ZrB2 are 0.185 and 0.222, respectivly. And dense ZrB：SiC ceramic with a porosity of 0.057 was prepared under the same conditions for comparison. The pores were homogeneously distributed within the microstructure of the porous ceramics. The results indicate a promising method for preparing porous ZrB：based ceramics.

关键词： zirconium diboride porous ceramic reactive spark plasma sintering

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Stability issues in computational screening of carbon nanostructures: illustrations on La endohedrals

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Molecular Simulation 2017年第17期43卷 1472页

作者： Slanina, Zdene k Akasaka, Takeshi Uhlík, Filip Adamowicz, Ludwik Nagase, Shigeru Lu, Xing Life Science Center of Tsukuba Advanced Research Alliance University of Tsukuba Tsukuba Japan . Faculty of Science Department of Physical and Macromolecular Chemistry Charles University Praha Czech Republic . Department of Chemistry and Biochemistry University of Arizona Tucson AZ USA . Fukui Institute for Fundamental Chemistry Kyoto University Kyoto Japan . State Key Laboratory of Materials Processing and Die & Mould Technology School of Material Science and Engineering Huazhong University of Science and Technology Wuhan China .

Three important stability problems frequently met in calculations of carbon nanostructures are outlined. The three relative-stability issues concern: isomeric carbon clusters, non-isomeric metallofullerenes differing in the number of the encapsulated metal atom yet placed in still isomeric carbon cages, and monometallofullerenes with different metals encapsulated in one selected carbon cage. The related computational approaches are illustrated with endohedrals based on La and its congeners located in [Formula omitted.] , [Formula omitted.] and [Formula omitted.] cages, both IPR (isolated-pentagon rule) and non-IPR ones, evaluated using various DFT treatments. It is also concluded that among the La congeners, Ac can produce the second best encapsulation energy, just after La.

关键词： La-based metallofullerenes La@ La@ La2@ La2@ Gibbs-energy stability evaluations stability islands Ac@

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