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Ultra-Thin Carbon-Doped Bi_(2)WO_(6) Nanosheets for Enhanced Photocatalytic CO_(2) Reduction

Transactions of Tianjin University 2021年第4期27卷 338-347页

作者： Han Li Junchao Zhang Jiaguo Yu Shaowen Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The photocatalytic reduction of CO_(2) is a promising strategy to generate chemical ***,this reaction usually suf-fers from low photoactivity because of insuffi cient light absorption and rapid charge *** engineering has become an eff ective approach to improve the photocatalytic ***,ultra-thin(~4.1 nm)carbon-doped Bi_(2)WO_(6) nanosheets were prepared via hydrothermal treatment followed by *** ultra-thin nanosheet structure of the cata-lyst not only provides more active sites but also shortens the diff usion distance of charge carriers,thereby suppressing charge ***,carbon doping could successfully extend the light absorption range of the catalyst and remarkably promote charge separation,thus inhibiting *** a result,the as-prepared Bi_(2)WO_(6) photocatalyst with ultra-thin nanosheet structure and carbon doping exhibits enhanced photocatalytic CO_(2) reduction performance,which is twice that of pristine ultra-thin Bi_(2)WO_(6) *** study highlights the importance of defect engineering in photocatalytic energy conversion and provides new insights for fabricating effi cient photocatalysts.

关键词： Defect engineering Bi_(2)WO_(6)nanosheet Charge separation Light absorption

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Revitalizing osmium-based catalysts for energy conversion

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Energy Reviews 2023年第4期2卷 81-88页

作者： Ding Chen Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Designing high cost-effective catalysts has been one of the core topics in energy conversion and *** to unique electronic structure and excellent comprehensive properties,Pt-group metal(PGM)based-materials occupy the top region of numerous volcanic curves and are currently difficult to be replaced by abundant tran-sition metal ***,we pay attention to the osmium(Os),as the cheapest and the least noticed PGM in the field of electrocatalysis,with promising application ***,the three main modification strategies(anion modulation,heterostructure construction,substrate engineering)of Os-based catalysts in hydrogen evolution reaction(HER),the structural advantages provided in oxygen evolution reaction(OER),and other energy-related electrocatalysis applications are discussed one by *** addition,we discuss the key problems and countermeasures faced in their further breakthroughs,and look forward to future development trends and ***,the insights in this work will promote the understanding and designation of Os-based catalysts.

关键词： Energy conversion Electrocatalysis Pt-group metals Os-based catalysts

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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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Preparation of Nanosized AlOOH and Its Application in Polymer-inorganic Nanocomposites

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Journal of Wuhan University of technology(materials Science) 2008年第5期23卷 638-643页

作者：廖海达 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology College of Chemistry and Ecological Engineering Guangxi University for Nationalities Key Lab of Nonferrous Materials and New Processing Technology (Guangxi University Guilin University of Technology) Ministry of Education

With industrial grade Al（OH）3 as raw materials, the self dispersion nanosized AlOOH crystal powder were prepared by the sol-hydrothermal method. The results of XRD and TEM show that the nanosized AlOOH could automatically disperse to a single-dispersing state in water without surface modification, dispersant, additive and accessional conditions （ultrasonic wave dispersing, ball-mill dispersing）. The application results of the product indicate that the nanosized AlOOH can be composed into a toughened nanocomposites without surface modification. Accordingly, the self dispersion characteristic and mechanism of hydrothermal crystallization and charging composite dispersion of nanosized AIOOH are found, and a new technique of preparing polymer/inorganic nanocomposites is proposed, which is called blending compositing new techniques of sol even dispersing at auasi-homogeneous phase.

关键词： self dispersion nanosized AlOOH peptizing-hydrothermal method nanocomposites

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Structure and electrical properties of ternary BiFeO_(3)-BaTiO_(3)-PbTiO_(3) high-temperature piezoceramics

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Journal of advanced Ceramics 2012年第3期1卷 227-231页

作者： Zhonghua YAO Ying LIU Zhe SONG Zhijian WANG Hua HAO Minghe CAO Zhiyong YU Hanxing LIU State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and Key Laboratory of Advanced Technology for Specially Functional Materials Ministry of EducationWuhan University of TechnologyWuhan 430070China

In the current work,the bulk ternary(0.85-x)BiFeO3-xBaTiO3-0.15PbTiO3(BF-BTx-PT,x=0.08-0.35)system has been studied as a potential high-temperature *** with various content of BT were prepared via solid-state route,and pure perovskite phase was confirmed by X-ray *** temperature dependence of dielectric constants confirmed the decrease of Curie temperature with increasing BT *** was found that the morphotropic phase boundary(MPB)composition of BF-BTx-PT ceramics was in the vicinity of x=0.15,which exhibits optimal properties with piezoelectric constant d33 of 60 pC/N,high Curie temperature of 550℃,and low sintering temperature of 920℃.Measurements also showed that the depoling temperature was 300℃,about 150℃higher than that of commercialized PZT ceramics,which indicated good temperature ***-BTx-PT ceramics are promising candidates for high temperature applications.

关键词： ceramics piezoelectric materials barium titanate perovskite ferroelectrics

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Room-temperature large photoinduced magnetoresistance in semi-insulating gallium arsenide-based device

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Chinese Physics B 2018年第6期27卷 394-399页

作者： Xiong He Zhi-Gang Sun State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

It is still a great challenge for semiconductor based-devices to obtain a large magnetoresistance（MR） effect under a low magnetic field at room temperature. In this paper, the photoinduced MR effects under different intensities of illumination at room temperature are investigated in a semi-insulating gallium arsenide（SI-Ga As）-based Ag/SI–Ga As/Ag device. The device is subjected to the irradiation of light which is supplied by light-emitting diode（LED） lamp beads with a wavelength in a range of about 395 nm–405 nm and the working power of each LED lamp bead is about 33 mW. The photoinduced MR shows no saturation under magnetic fields（B） up to 1 T and the MR sensitivity S（S = MR/B） at low magnetic field（B = 0.001 T） can reach 15 T^（-1）. It is found that the recombination of photoinduced electron and hole results in a positive photoinduced MR effect. This work implies that a high photoinduced S under a low magnetic field may be obtained in a non-magnetic semiconductor device with a very low intrinsic carrier concentration.

关键词： GaAs magnetoresistance carrier recombination

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Plausible role of point defects in the solid-state sintering of yttria-stabilized zirconia: A positron annihilation study

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JOURNAL OF materials SCIENCE LETTERS 1996年第23期15卷 2017-2019页

作者： Guo, X State Key Laboratory for Synthesis and Processing of Advanced Materials Wuhan University of Technology Wuhan Hubei Province China

Solid-state sintering of oxides involves a diffusion process of point defects. Some sintering models based on diffusion have been proposed. However, the application of these models needs a knowledge of the defect structure of oxides. The positron annihilation technique (PAT) is a suitable tool to study the solid-state sintering processes of oxides. The PAT study of the solid-state sintering of YS7 indicates that the cation interstitial diffusion plays an important role in the sintering.

关键词： Zirconia

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synthesis and Characterization of Soluble Aromatic Azopolyamides Containing Sulfone and Ether Units

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Journal of Wuhan University of technology(materials Science) 2009年第4期24卷 594-598页

作者：董丽杰熊传溪 School of Materials Science and Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

A series of new polyamides 3a-d containing aryl-azo, ether and sulfone groups in the main chain were synthesized from bis[4-（4-aminophenoxy）phenyl sulfone] 1 and several azo aromatic diacyl chlorides 2a-d by the low temperature solution polycondensation technique. FTIR spectroscopy, nuclear magnetic resonance （NMR） and elemental analyses confirmed the structure of these polymers. Owing to the aryl and amide groups in the main chain, these polymers exhibit photochromic properties as well as excellent thermal stabilities. The transition temperatures （Tg） are between 242 and 265℃, and the char yields at 800 ℃ in nitrogen atmosphere were above 39%. Based on incorporation of flexible ether linkages and polar sulfone groups, the polyamides show desirable solubility in organic solvents such as DMAc, N,N-dimethylformamide （DMF）, N-methyl-2-pyrroidinone （NMP） and dimethylsulfoxide （DMSO）. And it is exemplified that polyamide containing 2 and 2＇ substitutes performed better solubility.

关键词： aromatic azopolyamide photochromic behavior thermal properties soluble properties

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Printing strategies for scaling-up perovskite solar cells

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National Science Review 2021年第8期8卷 69-92页

作者： Yulong Wang Changyu Duan Pin Lv Zhiliang Ku Jianfeng Lu Fuzhi Huang Yi-Bing Cheng Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Department of Materials Science and Engineering Monash University

Photovoltaic technology offers a sustainable solution to the problem of soaring global energy ***, metal halide perovskite solar cells(PSCs) have attracted worldwide interest because of their high power conversion efficiency of 25.5% and great potential in becoming a disruptive technology in the photovoltaic industry. The transition from research to commercialization requires advancements of scalable deposition methods for both perovskite and charge transporting thin films. Herein, we share our view regarding the current challenges to fabrication of PSCs by printing techniques. We focus particularly on ink technologies, and summarize the strategies for printing uniform, pinhole-free perovskite films with good crystallinity. Moreover, the stability of perovskite solar modules is discussed and analyzed. We believe this review will be advantageous in the area of printable electronic devices.

关键词： printing technology perovskite solar cells ink large-area crystallization module stability

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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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