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Hierarchically nanostructured porous TiO_2(B) with superior photocatalytic CO_2 reduction activity

Science China Chemistry 2018年第3期61卷 344-350页

作者： Tingmin Di Jinfeng Zhang Bei Cheng Jiaguo Yu Jingsan Xu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Department of Physics Faculty of Science King Abdulaziz University School of Chemistry Physics and Mechanical Engineering Queensland University of Technology

Hierarchically nanostructured, porous TiO_2(B) microspheres were synthesized by a microwave-assisted solvothermal method combined with subsequent heat treatment in air. The materials were carefully characterized by scanning and transmission electron microscopy, X-ray diffraction, CO_2 adsorption, and a range of spectroscopies, including Raman, infrared, X-ray photoelectron and UV-Vis spectroscopy. The hierarchical TiO_2(B) particles are constructed by ultrathin nanosheets and possess large specific surface area, which provided many active sites for CO_2 adsorption as well as CO_2 conversion. The TiO_2(B)nanostructures exhibited marked photocatalytic activity for CO_2 reduction to methane and methanol. Anatase TiO_2 and P25 were used as the reference photocatalysts. Transient photocurrent measurement also proved the higher photoactivity of TiO_2(B) than that of anatase TiO_2. In-situ infrared spectrum was measured to identify the intermediates and deduce the conversion process of CO_2 under illumination over TiO_2(B) photocatalyst.

关键词： photocatalytic CO2 reduction TiO2（B） hierarchical nanostructure anatase TiO2

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Coal Gasification Fine Slag Residual Carbon Induced Rice Straw Hydrothermal Carbonization for Improvement of Residue Carbon Reactivity and Decontamination of Hydrothermal Wastewater

SSRN

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SSRN 2023年

作者： Lv, Peng Liu, Bin Bai, Yonghui Wang, Jiaofei Wei, Juntao Song, Xudong Su, Weiguang Yu, Guangsuo Xu, Guangyu School of Chemistry and Chemical Engineering State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering Ningxia University Yinchuan750021 China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and Engineering Nanjing Forestry University Nanjing210037 China Institute of Clean Coal Technology East China University of Science and Technology Shanghai200237 China Shandong Yankuangguotuo Science & Engineering Co. Ltd. Zoucheng273500 China

The large-scale resource utilization of coal gasification fine slag (CGFS) and the decontamination of wastewater in the hydrothermal carbonization (HTC) process of biomass are crucial to the production of clean fuels. In this study, the residual carbon in CGFS was recovered by froth flotation, and the HTC of rice straw induced by residual carbon was carried out at different residual carbon addition amount and hydrothermal temperatures. The physicochemical structure and fuel properties of hydrochar as well as water quality indicators of hydrothermal wastewater are carefully explored. The results showed that the combustion reactivity of residual carbon was significantly improved, showing an obvious synergistic effect after inducing HTC of rice straw. In addition, the wastewater produced by rice straw HTC was dark brown and contained high concentration of complex organic substances. The presence of residual carbon can significantly improve the water quality of hydrothermal wastewater by removing organic matter. The abundant pore structure of the residual carbon can adsorb and induce the polymerization of organic molecules in the aqueous phase to conversion into hydrochar, thereby reducing the concentration of organic compounds in the wastewater and improving the water quality. At the same time, it can also adsorb potassium metal ion dissolved in the aqueous phase by rice straw. Hydrochar formed on the surface of residual carbon has lower aromatic condensation degree and more carbon defects can provide more reaction sites and the catalytic effect of alkali metal adsorbed on it, all of which contribute to the synergistic effect of combustion reaction. © 2023, The Authors. All rights reserved.

关键词： Coal

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Prediction of stable high-pressure structures of tantalum nitride TaN2

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Journal of materials Science & technology 2019年第10期35卷 2297-2304页

作者： Wandong Xing Zijie Wei Rong Yu Fanyan Meng Department of Physics University of Science and Technology BeijingBeijing Engineering Research Center of Detection and Application for Weak Magnetic FieldBeijing100083China School of Automation University of Science and Technology BeijingBeijing100083China National Center for Electron Microscopy in Beijing School of Materials Science and EngineeringKey Laboratory of Advanced Materials of Ministry of Education of ChinaState Key Laboratory of New Ceramics and Fine ProcessingTsinghua UniversityBeijing100084China

Structure searches based on a combination of first-principles calculations and a particle swarm optimization technique unravel two new stable high-pressure structures(C2/m and Cmce) for Ta N2. The structural features, mechanical properties, formation enthalpies, electronic structure, and phase diagram of Ta N2 are fully investigated. Being mechanically and dynamically stable, the two phases could be made metastable experimentally at ambient conditions.

关键词： Particle swarm optimization First-principles Tantalum nitride Crystal structure High pressure

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Influence of titanium dopant on the physical properties and structure of tinantimony thin film

Influence of titanium dopant on the physical properties and ...

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第10届亚洲和澳大利亚真空与表面科学会议、中国真空学会2021学术年会、第十五届国际真空科学与工程应用学术会议

作者： Weihua Wu Long Zheng Jianzhong Xue Yongxing Sui Xiaoqin Zhu Bo Shen Jiwei Zhai Zhenxing Yue School of Mathematics and Physics Jiangsu University of Technology Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-Tech and NanoBionicsChinese Academy of Sciences Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesInstitute of SemiconductorsChinese Academy of Sciences Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials School of Materials Science & EngineeringTongji University State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University

Titanium-doped and un-doped Sb-rich SnSb thin films were systematically investigated in terms of the physical property and crystallization *** phase transition behaviors induced by heating and irradiating were examined by in situ resistance and reflectivity *** the addition of titanium atoms,the crystallization temperatureand electrical resistance increase remarkably,

关键词： physical property structural characterization Sn20Sb80 thin film titanium dopant

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Multiscale phase-field simulation framework for spinodal decomposition behavior in composite carbide ceramics

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Journal of materials Science & technology 2025年

作者： Zhixuan Zhang Yiqi Guan Hong Mao Qi Huang Na Li Weili Wang Weibin Zhang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University Jinan 250061 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China College of Mechanical Engineering Hunan Institute of Science and Technology Yueyang 414006 China

In traditional carbide ceramics, the inherent trade-off between hardness and toughness limits performance under extreme conditions. Spinodal decomposition enables the formation of nanoscale lamellar structures that simultaneously enhance both properties, yet precise control over microstructural evolution during aging remains challenging. This study develops a multiscale phase‐field simulation framework to clarify the formation mechanisms and mechanical contributions of lamellar structures in (Ti, Hf)C ceramics. Systematic experiments evaluated the effects of aging time and temperature on microstructure and properties. Initially, the phase‐field crystal method was applied to identify grain boundary defects, yielding critical insights. Subsequently, phase‐field simulations based on experimental data and key parameters investigated spinodal decomposition with an emphasis on its synergistic impact on crack propagation. Ultimately, (Ti 0.5 , Hf 0.5 )C achieved optimal performance after 10 h of aging at 1500°C, with a hardness of 2745 HV and a fracture toughness of 3.21 MPa m 1/2 .

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Fabrication of BaTiO 3@FeO Core-Shell Nanoceramics for Dielectric Capacitor Applications

SSRN

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SSRN 2020年

作者： Wang, Hongye Cao, Minghe Mao, Tenglong Fu, Jiqing Pan, Wengao Hao, Hua Yao, Zhonghua Liu, Hanxing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China International School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Center for Smart Materials and Device Integration

Nanoceramics have a wide application in dielectric field due to their excellent dielectric properties. However, it is extremely difficult to fabricate densified BaTiO3 with nanometer scale crystalline. In this study, nanoscale BaTiO3 ceramics are successfully fabricated by deposition of a FeO layer onto BaTiO3 nanoparticle, and the structure and dielectric behavior of the BaTiO3@FeO nanoceramics are systematically investigated. The multilayer structure including 1) an inner tetragonal core, 2) a gradient lattice strain layer and 3) a surface insulating layer makes the dielectric constant peak tend to be rounded and broadened. Consequently, an excellent temperature/frequency stability met the X7R requirements and accompanied by the low dielectric loss are achieved in the BaTiO3@FeO nanoceramics. © 2020, The Authors. All rights reserved.

关键词： Iron oxides

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Creep deformation and microstructure evolution of Ni-based superalloy GH3128 for VHTR applications

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Journal of Alloys and Compounds 2025年 1029卷

作者： Wang, Yue Yeli, Guma Yang, Hui Chen, Xiaotong Zhao, Hongsheng Shi, Li Li, Kejian Wang, Haitao Cai, Zhipeng Li, Caixia Huang, Jin Institute of Nuclear and New Energy Technology Tsinghua University Beijing100084 China Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Beijing100084 China State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China Collaborative Innovation Center of Advanced Nuclear Energy Technology Tsinghua University Beijing100084 China Gaona Aero Material Co. Ltd. Beijing100081 China

Creep behaviors and microstructure of Ni-based superalloy GH3128 were investigated based on creep tests under 9 different temperature-stress combinations. The underlying deformation mechanisms were discussed through analysis of stress exponents and microstructure evolution. The results indicated that after creep rupture at 850 °C, the microstructure of GH3128 featured significant precipitate formation, high-density dislocation pile-ups, and extensive dynamic recrystallization. Creep deformation was dominated by multiple mechanisms including dislocation climbing, dislocation-precipitate interactions, and grain boundary sliding, corresponding to a high stress-exponent of 8.5. As the testing temperature increased to 950 °C and 1000 °C, the density of precipitates decreased with growth in size. It was accompanied by reduced dislocation density and increased recrystallized grain size. Dislocation climbing controlled creep deformation, in which the stress exponents were respectively 6.1 and 5.5. © 2025 Elsevier B.V.

关键词： Creep

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Mechanism of CO and H 2 sensitization and selectivity to tone up by Er-doped SnO 2 thin film

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Sensors and Actuators B: Chemical 2025年 442卷

作者： Jie-Ting Zhao Yu Du Xing-Min Guo State Key Laboratory of Advanced Metallurgy and School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Engineering Research Centre for Deep Processing of Rare Metals School of Engineering Changchun Normal University Changchun 130032 China School of Materials Science and Engineering Lanzhou University of Technology Lanzhou 730050 China

Resistive gas sensors are utilized to identify target gases, particularly those with similar chemical properties, which poses a significant challenge in achieving selectivity. In this study, we fabricated a sensor with an Er-doped SnO 2 (S 1- x E x O 2-δ ) thin film to investigate the adsorption behavior of O 2 , CO, and H 2 on gas-sensing materials under varying temperatures and atmospheric conditions. This was accomplished through temperature-programmed desorption (TPD) tests and in-situ electrochemical impedance spectroscopy (EIS) to elucidate the mechanism that enhance sensitivity. The results indicate that the grain size of the S 1- x E x O 2-δ materials decreased with an increase of Er-doping. Concurrently, the number of oxygen vacancies and adsorbed oxygen molecules increased, resulting in a rise in the resistance of the S 1- x E x O 2-δ thin films (with x  = 0.03 and x  = 0.05) by approximately two orders of magnitude, thereby significantly enhancing sensor sensitivity. Furthermore, we observed that the selectivity of CO over H 2 could be improved by lowering the operating temperatures and increasing the Er-doping amount, suggesting the feasibility of using temperature modulation to distinguish between different gases. In addition, in-situ EIS revealed that the resistance of the S 1- x E x O 2-δ thin films predominantly originates from the grain boundaries of the materials, and the effects of temperature and atmosphere on the grain boundaries is also amplified as the Er-doping amount increases. Finally, we proposed a sensitivity-enhancing mechanism for the sensors, providing deeper insight into doping-induced sensitivity enhancements.

关键词： EIS in-situ research Er-doped SnO2 thin film Gas absorption Gas sensitive mechanism Resistive gas sensor

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Large-area perovskite solar cells

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Science Bulletin 2020年第11期65卷 872-875,M0003页

作者： Junliang Yang Chuantian Zuo Yong Peng Yang(Michael)Yang Xudong Yang Liming Ding State Key Laboratory of Powder Metallurgy School of Physics and ElectronicsCentral South UniversityChangsha 410083China CSIRO Manufacturing Bag 10Clayton SouthVictoria 3169Australia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310058China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Perovskite solar cells(PSCs)have been attracting much attention during the past years due to the advantages of perovskite materials such as high light absorption coefficient,excellent charge mobility,long charge diffusion length,tunable direct band gap,low cost,etc.,exhibiting great potential as the next-generation photovoltaic technology[1–3].

关键词：钙钛矿太阳电池 attracting charge

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Study on the Mechanism of the Effect of Biomass Ash on the Erosion and Adhesion Behavior of Al2o3 Ceramic Particles

SSRN

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SSRN 2023年

作者： Li, Yuchen Song, Xudong Wei, Juntao Bai, Yonghui Lv, Peng Xu, Guangyu Yu, Guangsuo State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering School of Chemistry and Chemical Engineering Ningxia University Yinchuan750021 China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources School of Materials Science and Engineering Nanjing Forestry University Nanjing210037 China Shandong Yankuangguotuo Science & Engineering Co. Ltd. Zoucheng273500 China Institute of Clean Coal Technology East China University of Science and Technology Shanghai200237 China

Biomass coupled with photothermal gasification technology is a new type of technology using heat carriers to transfer the solar energy to supply heat, and directs the solar energy absorbed by the heat carrier to provide a continuous heat source for biomass gasification. To investigate the erosion and adhesion mechanism of cornstalk ash (CSA) on heat carriers (Al2O3 ceramic spheres) during heat transfer, ash fusion temperature analyzer (AFTA) and FactSage thermodynamics software were used to analyze the effect of alumina addition over CSA sintering from the prospective of melting point, high-temperature heating stage coupled with optical microscope system (HSOM) was used to observe of the adhesion behavior of CSA on the surface of ceramic spheres, X-ray diffractometry (XRD) and Laser-induced breakdown spectroscopy (LIBS) were used to detect the mineral evolution from both matter and elements. The results showed that the sintering stage (FT-DT) of CSA extended by adding more than 5% of Al2O3 CSA. Furthermore, it was found that as the temperature increased, Al-containing minerals such as pyroxene and chalcocite were formed, which indicated the CSA began to erode the heat carrier by mineral evolution on the surface of ceramic spheres. At high temperatures (>1200 °C), CSA completely melted to form a liquid phase that wrapped around the surface of the ceramic spheres, which played a role in insulation layer during the cooling process to reduce the cooling rate of the surface of the ceramic sphere, resulting in more evident slagging problem. At the same time, the K and Ca element in the CSA was captured by ceramic spheres. The mineral transformation between the ceramic spheres and CSA was simulated by FactSage thermodynamic software, and it was found that the addition of Al2O3 resulted in the increase of the ash melting temperature and the formation of Al-containing mineral matters such as nepheline and augite. © 2023, The Authors. All rights reserved.

关键词： Biomass

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