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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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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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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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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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Effects of hydrogels composite grafted with IKVAV on neural stem cells

Effects of hydrogels composite grafted with IKVAV on neural ...

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Joint Symposium of International Neural Regeneration Symposium (INRS2016)and 10th Asia Pacific Symposium on Neural Regeneration (APSNR2016)

作者： Feng Xiong Yi-xia Yin Ping Zhang Hong-lian Dai Bin-bin Li Shi-pu Li State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and Biomaterials Science and Engineering Research CenterWuhan University of Technology

Successful stem cell-based therapy for neurological disorders is highly dependent on the survival of transplanted stem *** investigated the use of an injectable hydrogel grafted with IKVAV poly(lactide-co-ethylene oxide-co-fumarate) for enhancing the survival of transplanted neural stem cells(NSCs).The gelation properties of the hydrogel were first characterized and its biocompatibility was *** order to identify the biological safety of IKVAV composite hydrogel in vivo,we investigated the survival and proliferation of NSCs by immunofluorescence staining *** concentrations of grafted IKVAV poly(lactide-co-ethylene oxide-co-fumarate) hydrogels were seeded with NSCs derived from SD newborn rats,and then NSC viability and apoptosis assays were *** showed that the effects of hydrogel on NSC survival and proliferation were in a concentration-and time-dependent *** proliferation was highest after culture with 100 μg/m L IKVAV grafted hydrogels for 72 *** 24-hour culture,there was no difference in the number of apoptotic cells between 100 μg/m L IKVAV hydrogel-treated and IKVAV-free hydrogel *** together,hydrogel scaffolds can increase the survival of NSCs and 100 μg/m L IKVAV grafted hydrogels are likely to be the optimal hydrogel composition for the survival of NSCs.

关键词： neural stem cells IKVAV hydrogel biocompatibility

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Self-propelled Micro-/Nanomotors: Design Strategies, Motion Properties and Potential Applications

Self-propelled Micro-/Nanomotors: Design Strategies, Motion ...

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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： Jianguo Guan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of Technology

Micro-/nanomotors have fascinating capabilities to pick up,transport,and release various micro/nanocargoes because of the autonomous motion behaviors in liquid media,and can be used to perform complex tasks,including drug delivery,protein and cell separation,microsurgeries and environmental remediation,*** presentation firstly shows a biocompatible Magnesium-based Janus

关键词： Design Strategies Motion Properties and Potential Applications Nanomotors Self-propelled Micro

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Structure-dependent electrocatalytic activity of La_(1-x)SrxMnO_3 for oxygen reduction reaction

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Science China Chemistry 2015年第5期58卷 871-878页

作者： Guangjin Wang Tian Xu Sheng Wen Mu Pan College of Chemistry and Materials Science Hubei Engineering University State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Provincial Key Laboratory of Fuel Cell

The electrocatalytic activity toward oxygen reduction reaction is studied on the perovskite oxide La~_xbrxMnt）3, as preparea under different firing temperatures. X-ray diffraction shows that three different crystal phases featuring tetragonal, cubic, and orthorhombic symmetries form with increasing crystallinities. The electrocatalytic activity is characterized by cyclic voltam- metry and linear sweeping voltammetry for the three phases of La1-xSrxMnO3. We find that the tetragonal phase has the best catalytic activity among the three crystal phases, with the largest onset potential of 0.147 V. The synergistic effect between the volume per unit cell and crystallinity is indicated to account for the good catalytic activity of the tetragonal phase.

关键词： perovskite oxide La1-xSrxMnO3 crystal phase crystallinity oxygen reduction reaction

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Electron-pinned defect-dipoles for SrTiO3-based ceramics with high permittivity and low dielectric loss

Electron-pinned defect-dipoles for SrTiO3-based ceramics wit...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Zichen He Minghe Cao Nana Wang Qi Zhang Hua Hao Zhonghua Yao Hanxing Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan Hubei People's Republic of China

ISBN: (纸本)9781509018727

Sr(Nb 0.5 Al 0.5 ) x Ti 1-x O 3 (x=0, 0.02, 0.04, 0.06) ceramics were obtained via solid-state reaction method and sintering in air at 1540°C. The grain size of SrTiO 3 ceramics decreased with Nb 2 O 5 and Al 2 O 3 doping content. Sr(Nb 0.5 Al 0.5 ) x Ti 1-x O 3 ceramics exhibit a giant permittivity of about 10500 and low dielectric loss of 0.03 measured at room temperature and 1kHz. According to the XRD, XPS, and ac conductivity analysis, this excellent dielectric behaviors of Sr(Nb 0.5 Al 0.5 ) x Ti 1-x O 3 ceramics would originate the bond[Ti 4+ ·e-V O .. -Ti 4+ ·e], in which the electrons were bound by Ti 4+ and V O .. leading to low dielectric loss. Compared with SrNb 0.01 Ti 0.99 O 3 and In addition, SNAT ceramics were also sintered in oxygen atmosphere and nitrogen atmosphere to verify the existence of [Ti 4+ ·e-V O .. -Ti 4+ ·e].

关键词： Ceramics Permittivity Dielectric losses Temperature measurement Dielectric measurement Conductivity

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Three-dimensional porous V2O5 hierarchical octahedrons with adjustable pore architectures for long-life lithium batteries

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Nano Research 2015年第2期8卷 481-490页

作者： Qinyou An Pengfei Zhang Fangyu Xiong Qiulong Wei Jinzhi Sheng Qinqin Wang Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT-Harvard Joint Nano Key LaboratoryWuhan University of Technology Wuhan Hubei 430070 China

Three-dimensional （3D） porous V2O5 octahedrons have been successfully fabricated via a solid-state conversion process of freshly prepared ammonium vanadium oxide （AVO） octahedrons. The formation of AVO octahedrons is a result of the selective adsorption of capping reagents and the favourable supersaturation of growth species. Subsequently, 3D porous V2O5 octahedrons were obtained by simple thermolysis of the AVO octahedrons via a calcination treatment. As cathode material for lithium batteries, the porous V2O5 octahedron cathode exhibits a capacity of 96 mAh·g^-1 at high rate up to 2 A·g^-1 in the rang of 2.4 4 V and excellent cyclability with little capacity loss after 500 cycles, which can be ascribed to its high specific surface area and tunable pore architecture. Importantly, this facile solid-state thermal conversion strategy can be easily extended to controllably fabricate other porous metal oxide micro/nano materials with specific surface textures and morphologies.

关键词： V2O5 octahedron adjustable pore long-life lithium battery

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