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Photocatalytic CO2Reduction Over BiOX on Needle Coke-Derived Graphene Composites 认领 引用
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作者 Tongyu Wu Xiaoxiao Yu +5 位作者 Fuhai Zhang Lei Wang Minmeng Tang Yanhong Chao Haiyan Liu Wenshuai Zhu 《Carbon and Hydrogen》 SCIE CAS CSCD 2026年第2期217-225,共9页
Substantial research has been dedicated to advancing visible-light photocatalysts for the conversion of CO2into sustainable fuels.The overall efficiency of this process is critically dependent on both the effective... Substantial research has been dedicated to advancing visible-light photocatalysts for the conversion of CO2into sustainable fuels.The overall efficiency of this process is critically dependent on both the effective generation/separation of photogenerated charge carriers and the adsorption/activation of CO2reactants.Bismuth oxyhalides(BiOX)are promising due to their layered structure and built-in electric field,which facilitate charge separation.However,their practical application is often limited by insufficient CO2adsorption capacity and restricted visible-light harvesting.Herein,we report a series of composite photocatalysts constructed via the in situ growth of BiOX on needle coke-derived graphene(NCG).This integrated structure leverages the high specific surface area and inherent heteroatom doping of NCG to enhance CO2adsorption,while the resulting intimate heterojunction significantly promotes visible-light absorption(especially within 500-800 nm)and accelerates interfacial charge transfer.The optimized BiOBr-25%NCG composite achieves a remarkable CO production rate of 46.32μmol·g−1·h−1from photocatalytic CO2reduction without any sacrificial agents,representing a 13-fold enhancement over pristine NCG and a∼4000-fold increase compared to bare BiOBr.The superior performance is attributed to the synergistic enhancement of light absorption,charge separation kinetics,and CO2adsorption activation.This work presents a viable strategy for developing efficient,low-cost photocatalytic systems by integrating functional carbon matrices derived from industrial byproducts with semiconductor catalysts. 展开更多
关键词 BiOBr CO2reduction composite material needle coke-derived graphene photocatalysis
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On-site hydrolytic H2production by CaH2/(Al/Si)composites via Na+bridging effect for fuel cell 认领 引用
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作者 Ali Hammad Siyi Zou +7 位作者 Fandi Ning Ghulam Nabi Yuzhuo Jiang Bin Tian Wentao Huang Muhammad Rashid Shiqi Zhao Xiaochun Zhou 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第1期97-110,I0004,共14页
Inorganic materials can solve transportable and on-site hydrolytic hydrogen generation issues.CaH2/(Al/Si)composites are preferable due to their notable chemical properties.However,these composites require pretreat... Inorganic materials can solve transportable and on-site hydrolytic hydrogen generation issues.CaH2/(Al/Si)composites are preferable due to their notable chemical properties.However,these composites require pretreatments,an inert environment,and long hours of physical ball milling for high homogeneity and synergistic effects.CaH2also inhibits the hydrolysis reaction by forming its products on the Al/Si surface,which hinders the direct utilization of composites.This work represents the first investigation of NaH-CaH2(Al/Si)fuel composites,which greatly overcome these limitations and can be directly used for on-site hydrogen generation and proton exchange membrane(PEM)fuel cells.The NaH-CaH2(Al/Si)fuel composites were prepared by using a straightforward mixing method with variable composition ratios,showing high H2yield and fuel cell(FC)performance.NaH addition provides the bridge effect,which opens up a new way to enable efficient hydrolysis and greatly enhances the hydrolysis activity of CaH2/(Al/Si)composites.The novel fuel composites(NaH-CaH2/Al)have extraordinary FC performance and a 0.42 W/cm2 peak power density greater than commercial hydrogen generators.It provides high H2yield 84.4%for NaH-CaH2/Al and 82%for NaH-CaH2/Si compared to NaOH-CaH2(Al/Si),NaCl-CaH2(Al/Si),and KCl-CaH2(Al/Si)composites.The NaH bridge effect hinders the direct water contact and stops the formation of Ca(OH)2 around Al/Si,which provides adequate pathways for the CaH2(Al/Si)hydrolysis.The impressive capabilities of novel fuel composites are anticipated to offer practical uses in fuel cells,automobile applications,and portable/on-board H2generation. 展开更多
关键词 On-site hydrogen Hydrolysis Fuel composites NaH-CaH2/(Al/Si) Bridge effect Ambient temperature Inorganic materials High H2yield PEM fuel cell
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Effects of current density on preparation and performance of Al/conductive coating/α-PbO_2-Ce O_2-TiO_2/β-Pb O_2-MnO_2-WC-ZrO_2 composite electrode materials 认领 引用 被引量：6
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作者 杨海涛 陈步明 +5 位作者 郭忠诚 刘焕荣 张永春 黄惠 徐瑞东 付仁春 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第10期3394-3404,共11页
Al/conductive coating/α-Pb O2-Ce O2-Ti O2/β-PbO 2-MnO 2-WC-Zr O2 composite electrode material was prepared on Al/conductive coating/α-PbO 2-Ce O2-Ti O2 substrate by electrochemical oxidation co-deposition technique... Al/conductive coating/α-Pb O2-Ce O2-Ti O2/β-PbO 2-MnO 2-WC-Zr O2 composite electrode material was prepared on Al/conductive coating/α-PbO 2-Ce O2-Ti O2 substrate by electrochemical oxidation co-deposition technique. The effects of current density on the chemical composition, electrocatalytic activity, and stability of the composite anode material were investigated by energy dispersive X-ray spectroscopy（EDXS）, anode polarization curves, quasi-stationary polarization（Tafel） curves, electrochemical impedance spectroscopy（EIS）, scanning electron microscopy（SEM）, and X-ray diffraction（XRD）. Results reveal that the composite electrode obtained at 1 A/dm2 possesses the lowest overpotential（0.610 V at 500 A/m2） for oxygen evolution, the best electrocatalytic activity, the longest service life（360 h at 40 °C in 150 g/L H2SO4 solution under 2 A/cm2）, and the lowest cell voltage（2.75 V at 500 A/m2）. Furthermore, with increasing current density, the coating exhibits grain growth and the decrease of content of Mn O2. Only a slight effect on crystalline structure is observed. 展开更多
关键词 composite electrode material A1 substrate β-PbO2-MnO2-WC-ZrO2 electrochemical co-deposition current density
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Electrochemical performance of LiFePO4-Li3V2(PO_4)_3 composite material prepared by solid-hydrothermal method 认领 引用 被引量：4
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作者 郭孝东 钟本和 +3 位作者 刘恒 宋杨 文嘉杰 唐艳 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第8期1761-1766,共6页
LiFePO4-Li3V2（PO4）3 composites were synthesized by solid-hydrothermal method and by ball milling,respectively.The electrochemical performance of the solid-hydrothermally obtained materials（C-LFVP） was significantl... LiFePO4-Li3V2（PO4）3 composites were synthesized by solid-hydrothermal method and by ball milling,respectively.The electrochemical performance of the solid-hydrothermally obtained materials（C-LFVP） was significantly improved compared with LiFePO4（LFP） and Li3V2（PO4）3（LVP）,and it was also much better than that of the ball-milled LiFePO4-Li3V2（PO4）3（P-LFVP）.C-LFVP and P-LFVP both had four REDOX peaks（voltage plateaus）,which coincided with that of LFP and LVP.Some new trace substances were found in C-LFVP which had more perfect morphology,this was responsible for the better electrochemical performance of C-LFVP than P-LFVP. 展开更多
关键词 LiFePO4 Li3V2（PO4）3 composite materials solid-hydrothermal
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Al23/Al2O3 Joint Brazed with Al2O3-particulate-contained Composite Ag-Cu-Ti Filler Material 认领 引用 被引量：2
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作者 Jianguo YANG Hongyuan FANG Xin WAN 《Journal of Materials Science & Technology》 SCIE EI CAS 2005年第5期782-784,共3页
Microstructure and interracial reactions of Al2O3 joints brazed with Al2O3-particulate-contained composite Ag-Cu-Ti filler material were researched by scanning electron microscopy(SEM),electron probe microscopy analys... Microstructure and interracial reactions of Al2O3 joints brazed with Al2O3-particulate-contained composite Ag-Cu-Ti filler material were researched by scanning electron microscopy(SEM),electron probe microscopy analysis(EPMA),energy dispersive spectroscopy(EDS)and X-ray diffraction(XRD).The interracial reaction layer thickness of joints brazed with conventional active filler metal and active composite filler materials with different volume fraction of Al2O3 particulate was also studied.The experimental results indicated although there were Al2O3 particulates added into active filler metals,the time dependence of interracial layer growth of joints brazed with active composite filler material is t^1/2 as described by Fickian law as the joints brazed with conventional active filler metal. 展开更多
关键词 Composite filler materials Braze Interface Al2O3
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Preparation and Properties of Y2O3-PF Alternating Coating on Polymer Matrix Composite Material Surface 认领 引用 被引量：2
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作者 Li Xuewu Zhang Jiahao +5 位作者 Feng Yuxi Liu Ming Shi Tian Wang Haidou Bai Yu Wang Yu 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2024年第10期2777-2785,共9页
High-performance yttrium oxide-phenolic resin(Y2O3-PF)alternating coating was prepared on epoxy resin-based composite material using supersonic plasma spraying and dual-channel powder feeding technique.Y2O_(3... High-performance yttrium oxide-phenolic resin(Y2O3-PF)alternating coating was prepared on epoxy resin-based composite material using supersonic plasma spraying and dual-channel powder feeding technique.Y2O3-coated PF(Y2O3/PF)powder was firstly sprayed onto the substrate,forming a transition layer,and then the spherical Y2O3 powder and Y2O3/PF powder were alternately deposited to form the composite alternating coating.Results show that the alternating coating is mainly composed of deposited Y2O3/PF powder.The bonding strength between coating and substrate is as high as 26.48 MPa with the single-test maximum bonding strength of 28.10 MPa,and shear strength reaches 24.30 MPa.Additionally,the heat transfer effect caused by external Y2O3 particles gradually softens and even melts PF,thus effectively avoiding the damage of high temperature to molecular structure and thereby promoting the crosslinking and curing effects of resin during the deposition process.In the meantime,the unmelted Y2O3 powder results in the shot peening effect,which washes out and eliminates the powder particles with inferior deposition effect,ultimately improving the physical and chemical properties of the alternating coating. 展开更多
关键词 Y2O3-PF alternating coating epoxy resin composite material supersonic plasma spraying mechanical property
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Effect of baking processes on properties of TiB_2/C composite cathode material 认领 引用 被引量：1
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作者 吕晓军 李劼 +1 位作者 赖延清 方钊 《Journal of Central South University》 SCIE EI CAS 2009年第3期429-433,共5页
Pitch and TiB2/C green composite cathode material were respectively analyzed with simultaneous DSC-TGA, and effects of three baking processes of TiB2/C composite cathode material, i.e. K25, K5 and M5, on properties of... Pitch and TiB2/C green composite cathode material were respectively analyzed with simultaneous DSC-TGA, and effects of three baking processes of TiB2/C composite cathode material, i.e. K25, K5 and M5, on properties of TiB2/C composite cathode material were investigated. The results show that thermogravimetrie behavior of pitch and TiB2/C green composite cathode is similar, and appears the largest mass loss rate in the temperature range from 200 to 600 ℃. The bulk density variation of sample K5 before and after baking is the largest （11.9%）, that of sample K25 is the second, and that of sample M5 is the smallest （6.7%）. The crushing strength of sample M5 is the biggest （51.2 MPa）, that of sample K2.5 is the next, and that of sample K5 is the smallest （32.8 MPa）. But, the orders of the electrical resistivity and electrolysis expansion of samples are just opposite with the order of crushing strength. The heating rate has a great impact on the microstructure of sample. The faster the heating rate is, the bigger the pore size and porosity of sample are. Compared with the heating rate between 200 and 600℃ of samples K25 and K5, that of sample M5 is slower and suitable for baking process of TiB2/C composite cathode material. 展开更多
关键词 aluminum electrolysis TiB2/C composite cathode material baking process
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Copolymer Template-Assisted Synthesis of Porous Li2FeSiO4@C/CNTs Nanocomposite as Cathode Material with High Rate Capability 认领 引用
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作者 GOU Lei ZHAO Kun +5 位作者 MAO Yi-Yang XIE Rong FAN Xiao-Yong LI Dong-Lin MA Shou-Long TIAN Miao 《无机化学学报》 SCIE CAS CSCD 北大核心 2015年第12期2401-2410,共10页
Li2FeSiO4@C/CNTs(LFS@C/CNTs)nanocomposite was synthesized by a sol-gel method.A triblock copolymer P123 was used as the direction agent for nanopores and carbon source,and carbon nanotubes were used as conductiv... Li2FeSiO4@C/CNTs(LFS@C/CNTs)nanocomposite was synthesized by a sol-gel method.A triblock copolymer P123 was used as the direction agent for nanopores and carbon source,and carbon nanotubes were used as conductive wires to further increase the conductivity of the material.The resulting LFS@C/CNTs nanocomposite possesses not only a nanoporous sponge-like structure for improving Li-ions transport by means of liquid electrolyte,but also a 3D self-bridged conduction hybrid network consisted of amorphous carbon coating and graphitized CNTs for electron fast transport that ultimately improves the high rate capability and cycling performance.As a result,the porous LFS@C/CNTs nanocomposite compared with nanoporous LFS@C exhibits a remarkable improvement in high-rate capability.The LFS@C/CNTs nanocomposite with 4wt%of CNTs delivers a specific discharge capacity of approximately 182 m Ah·g-1at 0.1C in the voltage window of 1.5~4.5 V,and the specific discharge capacity at 10 C after 70 cycles maintains at 117 m A·h·g-1,which is more than two times that of LFS@C(55 m Ah·g-1)as a cathode material for high power lithium ion battery. 展开更多
关键词 Li2FeSiO4 composite materials carbon nanotube lithium ion battery rate performance
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Hydrothermal synthesis of spindle-like Li_2FeSiO_4-C composite as cathode materials for lithium-ion batteries 认领 引用 被引量：5
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作者 Haiyan Gao Zhe Hu +3 位作者 Kai Zhang Fangyi Cheng Zhanliang Tao Jun Chen 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2014年第3期274-281,共8页
In this paper,we report on the preparation of Li2FeSiO4,sintered Li2FeSiO4,and Li2FeSiO4-C composite with spindle-like morphologies and their application as cathode materials of lithium-ion batteries.Spindle-like Li2F... In this paper,we report on the preparation of Li2FeSiO4,sintered Li2FeSiO4,and Li2FeSiO4-C composite with spindle-like morphologies and their application as cathode materials of lithium-ion batteries.Spindle-like Li2FeSi04 was synthesized by a facile hydrothermal method with（NH4）2Fe（SO4）2 as the iron source.The spindle-like Li2FeSiO4 was sintered at 600 ℃ for 6 h in Ar atmosphere.Li2FeSiO4-C composite was obtained by the hydrothermal treatment of spindle-like Li2FeSiO4 in glucose solution at 190 ℃ for 3 h.Electrochemical measurements show that after carbon coating,the electrode performances such as discharge capacity and high-rate capability are greatly enhanced.In particular.Li2FeSiO4-C with carbon content of 7.21 wt%delivers the discharge capacities of 160.9 mAh·g-1 at room temperature and 213 mAh·g-1 at45℃（0.1 C）,revealing the potential application in lithium-ion batteries. 展开更多
关键词 Li2FeSiO4-C composite spindle like hydrothermal synthesis cathode material lithium-ion battery
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Facile one-step synthesis of Cu_2O@Cu sub-microspheres composites as anode materials for lithium ion batteries 认领 引用 被引量：4
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作者 Huijie Zhou Hongbin Zhao +3 位作者 Xuan Zhang Hongwei Cheng Xionggang Lu Qian Xu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2018年第7期1085-1090,共6页
Cu2O@Cu sub-microspheres composites with a narrow particle size distribution from 300 to 500 nm was successfully fabricated by one-step synthesis through the direct thermal decomposition of copper nitrate （Cu（NO3）2... Cu2O@Cu sub-microspheres composites with a narrow particle size distribution from 300 to 500 nm was successfully fabricated by one-step synthesis through the direct thermal decomposition of copper nitrate （Cu（NO3）2） in octadecylamine （ODA） solvent. As anode materials for lithium ion batteries, the Cu2O@Cu composites obviously possess high specific capacity, excellent cyclic stability and rate capability. The coulombic efficiency is about 84% in the 1 st cycle and increases significantly up to 97.8% during successive cycles at various current densities. Even under a high current density of 500 mA g^-l, the discharge capacity of Cu2O@Cu composites remains up to 200 mAh g^-1. The excellent electrochemical properties are ascribed to the synergistic effect between high electronic conductivity and volume-buffering capacity of metallic copper composited with Cu2O.2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology. 展开更多
关键词 Cu2O@Cu composites Anode materials Octadecylamine One-step synthesis
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Characterization of Calcined Kaolin/TiO2Composite Particle Material Prepared by Mechano-Chemical Method 认领 引用 被引量：12
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作者 WANG Baikun DING Hao DENG Yanxi 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第5期765-769,共5页
Calcined kaolin/TiO2 composite particle material(CK/TCPM)was prepared with TiO2 coating on the surfaces of calcined kaolin particles by the mechano-chemical method.X-ray diffraction(XRD)and scanning electron microscop... Calcined kaolin/TiO2 composite particle material(CK/TCPM)was prepared with TiO2 coating on the surfaces of calcined kaolin particles by the mechano-chemical method.X-ray diffraction(XRD)and scanning electron microscope(SEM)were used to investigate the microstructures and morphologies,respectively.The mechanism of the mechano-chemical reaction between calcined kaolin and TiO2 was studied by infrared spectra(IR).The results show that TiO2 coats evenly on the surfaces of calcined kaolin particles by Si-O-Ti and Al-O-Ti bonds on their interfaces.The hiding power and whiteness of CK/TCPM are 17.12 g/m^2 and 95.7%,respectively,presenting its similarity to TiO2 in pigment properties. 展开更多
关键词 mechano-chemical method calcined kaolin TiO2 composite particles material pigment properties
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Luminescence properties of composite material Sr2MgSi2O7:Eu2+,Dy3+/light conversion agent with multilayer structure 认领 引用 被引量：4
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作者 Liubin Zheng Yanan Zhu +1 位作者 Zengyuan Pang Mingqiao Ge 《Journal of Rare Earths》 SCIE EI CAS CSCD 2022年第1期34-40,共7页
In order to improve the red luminescent properties,Sr2MgSi2O7:Eu2+,Dy3+was selected as a blue persistent luminescent donor phosphor,while light conversion agent was utilized to tune the persistent lumin... In order to improve the red luminescent properties,Sr2MgSi2O7:Eu2+,Dy3+was selected as a blue persistent luminescent donor phosphor,while light conversion agent was utilized to tune the persistent luminescent spectra from blue to red.Composite red luminescent material Sr2MgSi2O7:Eu2+,Dy3+/light conversion agent(SMED/LCA)was fabricated with light conversion agent and Sr2MgSi2O7:Eu2+,Dy3+at a certain mass ratio.SiO2(Al2 O3 or MgF2)were coated on the surface of SMED/LCA through heterogeneous deposition method.The structural and optical characteristics of the resulting samples were launched in terms of X-ray diffraction and emission spectrum as well as afterglow brightness.The results demonstrate that the emission spectrum exhibits two emission bands,and the peaks are located at around 470 and 615 nm.SiO2,Al2O3 and MgF2 are coated on the surface of SMED/LCA like a protective shell to maintain its stability and luminescent properties,the afterglow initial brightness is still up to 0.37 cd/m2 and the afterglow color purity calculated from CIE color coordinates is basically unchanged. 展开更多
关键词 Sr2MgSi2O7:Eu2+,Dy3+ Light conversion agent Stability Multilayer structure Composite material Rare earths
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TiO2-PES Fibrous Composite Material for Ammonia Removal Using UV-A Photocatalyst 认领 引用
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作者 Anh Phuong Le Thi Masaru Ohshiro Takaomi Kobayashi 《Journal of Materials Science and Chemical Engineering》 2024年第1期1-19,共19页
This study focused on the development and characterization of TiO2-PES composite fibers with varying TiO2 loading amounts using a phase inversion process. The resulting composite fibers exhibited a sponge-like structu... This study focused on the development and characterization of TiO2-PES composite fibers with varying TiO2 loading amounts using a phase inversion process. The resulting composite fibers exhibited a sponge-like structure with embedded TiO2 nanoparticles within a polymer matrix. Their photocatalytic performance for ammonia removal from aqueous solutions under UV-A light exposure was thoroughly investigated. The findings revealed that PeTi8 composite fibers displayed superior adsorption capacity compared to other samples. Moreover, the study explored the impact of pH, light intensity, and catalyst dosage on the photocatalytic degradation of ammonia. Adsorption equilibrium isotherms closely followed the Langmuir model, with the results indicating a correlation between qm values of 2.49 mg/g and the porous structure of the adsorbents. The research underscored the efficacy of TiO2 composite fibers in the photocatalytic removal of aqueous under  UV-A light. Notably, increasing the distance between the photocatalyst and the light source resulted in de-creased hydroxyl radical concentration, influencing photocatalytic efficiency. These findings contribute to our understanding of TiO2 composite fibers as promising photocatalysts for ammonia removal in water treatment applications. 展开更多
关键词 Ammonia Removal Photocatalyst TiO2-PES Composite Fiber Fibrous Material
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Preparation and electrochemical property of Cs0.35V2O5/Cu composite material 认领 引用
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作者 CAO Xiao-yu YANG Jun XIE Ling-ling LIU Xing WANG Hong-yan YAN Xiang-yang 《Journal of Chemistry and Chemical Engineering》 2008年第6期52-55,共4页
Cs0.35V2O5 was successfully synthesized as cathode material for lithium secondary battery by the rheological phase reaction method from Cs2CO3 and NH4VO3. The Cs0.35V2O5/Cu composite material was prepared by the displ... Cs0.35V2O5 was successfully synthesized as cathode material for lithium secondary battery by the rheological phase reaction method from Cs2CO3 and NH4VO3. The Cs0.35V2O5/Cu composite material was prepared by the displacement reaction in CuSO4 solution using zinc powder as a reductant. The structure and electrochemical property of the so-prepared powders were characterized by means of XRD （powder X-ray diffraction） and the galvanostatic discharge-charge techniques. The results show that the electrochemical property of Cs0.35V2O5/Cu composite material is significantly improved compared to the bulk Cs0.35V2O5 material. The Cs0.35V2O5/Cu composite material exhibits the first discharge capacity as high as 164.3 mAh.g -1 in the range of 4.2-1.8V at a current rate of 10 mA.g-1 and remains at a stable discharge capacity of about 110 mAh.g-1 within 40 cycles. 展开更多
关键词 lithium secondary batteries cathode material Cs0.35V2O5/Cu composite material electrochemical property
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Microstructure of TA2/TA15 graded structural material by laser additive manufacturing process 认领 引用 被引量：48
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作者 Ting-ting QIAN Dong LIU +2 位作者 Xiang-jun TIAN Chang-meng LIU Hua-ming WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第9期2729-2736,共8页
TA2/TA15 graded structural material(GSM)was fabricated by the laser additive manufacturing(LAM)process.The chemical composition,microstructure and micro-hardness of the as-deposited GSM were investigated.The results s... TA2/TA15 graded structural material(GSM)was fabricated by the laser additive manufacturing(LAM)process.The chemical composition,microstructure and micro-hardness of the as-deposited GSM were investigated.The results show that the TA2 part of exhibiting near-equiaxed grains was Widmanst?ttenα-laths microstructure.The TA15 part containing large columnar grains was fine basket-weave microstructure.The graded zone was divided into four deposited layers with 3000μm in thickness.As the distance from the TA2 part increases,the alloy element contents and theβphase volume fraction increase,theαphase volume fraction decreases and the microstructure shows the evolution from Widmanst?ttenα-laths to basket-weaveα-laths gradually.The micro-hardness increases from the TA2 part to the TA15 part due to the solid solution strengthening and grain boundary strengthening. 展开更多
关键词 laser additive manufacturing TA2/TA15 graded structural material microstructure chemical composition
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Review on porous nanomaterials for adsorption and photocatalytic conversion of CO_2 认领 引用 被引量：10
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作者 Yajuan Ma Zemei Wang +1 位作者 Xiaofeng Xu Jingyu Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第12期1956-1969,共14页
Photocatalytic conversion of“greenhouse gas”CO2is considered to be one of the most effective ways to alleviate current energy and environmental problems without additional energy consumption and pollutant emission.T... Photocatalytic conversion of“greenhouse gas”CO2is considered to be one of the most effective ways to alleviate current energy and environmental problems without additional energy consumption and pollutant emission.The performance of many traditional semiconductor photocatalysts is not efficient enough to satisfy the requirements of practical applications because of their limited specific surface area and low CO2adsorption capacity.Therefore,the exploration of photocatalysts with high CO2uptake is significant in the field of CO2conversion.Recently the porous materials appeared to be a kind of superior candidate for enriching the CO2molecules on the surface of photocatalysts for catalytic conversion.This paper first summarizes the advances in the development of nanoporous adsorbents for CO2capture.Three main classes of porous materials are considered:inorganic porous materials,metal organic frameworks,and microporous organic polymers.Based on systematic research on CO2uptake,we then highlight the recent progress in these porous‐material‐based photocatalysts for CO2conversion.Benefiting from the improved CO2uptake capacity,the porous‐material‐based photocatalysts exhibited remarkably enhanced efficiency in the reduction of CO2to chemical fuels,such as CO,CH4,and CH3OH.Based on reported recent achievements,we predict a trend of development in multifunctional materials with both high adsorption capability and photocatalytic performance for CO2utilization. 展开更多
关键词 Porous material Composite nanostructure CO2 adsorption Photocatalysis CO2 conversion
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Enhanced thermoelectric performance of Bi2Se3/TiO2 composite 认领 引用 被引量：8
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作者 Yu-Xi Yang Ye-Hao Wu +3 位作者 Qi Zhang Gao-Shao Cao Tie-Jun Zhu Xin-Bing Zhao 《Rare Metals》 SCIE EI CAS CSCD 2020年第8期887-894,共8页
Bi2(Te,Se)3 alloys are conventional commercial thermoelectric materials for solid-state refrigeration around room temperature.In recent years,much attention has been paid to various advanced thermoelectric composite m... Bi2(Te,Se)3 alloys are conventional commercial thermoelectric materials for solid-state refrigeration around room temperature.In recent years,much attention has been paid to various advanced thermoelectric composite materials due to the unique thermoelectric properties.In this work,Bi2Se3/TiO2 composites were prepared by hot pressing the plate-like Bi2Se3 powders coated in situ with hydrolyzed hytetabutyl-n-butyl titanate(TNBT),and therefore numerous TiO2 in micrometer size could be formed on the interface of Bi2Se3 grains.The carrier concentration in Bi2Se3 matrix is optimized subject to the addition of n-type semiconductor TiO2,contributing to a significant improved power factor.In the meantime,the lattice thermal conductivity is also suppressed due to the enhanced phonon scattering at Bi2Se3/TiO2 interface and amorphous TiO2 particles.As a consequence,a peak figure of merit(zT)of 0.41 is obtained at 525 K in Bi2Se3/15 mol%TiO2 composites,nearly 50%augment over the pristine Bi2Se3 binary compound. 展开更多
关键词 Bi2(Te,Se)3 Thermoelectric materials TiO2 Composite
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Microstructure and properties of Ag/SnO2 functional material manufactured by selective laser melting 认领 引用 被引量：7
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作者 Yuanjie Zhang Bo Song +1 位作者 Xiao Zhao Yusheng Shi 《Nano Materials Science》 EI CAS 2019年第3期208-214,共7页
Ag/SnO2,as a promising and environment-friendly electrical contact material,is widely applied in low-voltage apparatus.But the properties of Ag/SnO2 composites is difficult to improve due to the poor distribution phas... Ag/SnO2,as a promising and environment-friendly electrical contact material,is widely applied in low-voltage apparatus.But the properties of Ag/SnO2 composites is difficult to improve due to the poor distribution phases and difficult component design.In this work,the Ag/SnO2 composites are prepared by selective laser melting.To get better performance,Ag/SnO2 composites with different energy density were studied.The microstructure was observed by field emission scanning electron microscope.In addition,reinforced SnO2 phase was characterized by X-ray diffraction and transmission electron microscope.The results indicated that the microstructure,relative density and hardness of are influenced by energy density,while Ag/SnO2 composites with homogeneous microstructure,high relative density,higher hardness and lower electrical resistivity can be obtained by proper energy density(E?68 J/mm^3). 展开更多
关键词 Selective laser melting Ag/SnO2 Composites Electrical contact material
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Corrosion resistance evaluation of highly dispersed MgO–MgAl2O4–ZrO2 composite and analysis of its corrosion mechanism: A chromium-free refractory for RH refining kilns 认领 引用 被引量：5
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作者 Yi-nan Shen Yi Xing +4 位作者 Peng Jiang Yong Li Wen-dong Xue Guo-xiang Yin Xue-qin Hong 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2019年第8期1038-1046,共9页
The corrosion resistance behavior of a highly dispersed MgO-MgAl2O4-ZrO2 composite refractory material is examined by testing with high-basicity and low-basicity RH(Ruhrstahl-Hereaeus)slags.The composite material exhi... The corrosion resistance behavior of a highly dispersed MgO-MgAl2O4-ZrO2 composite refractory material is examined by testing with high-basicity and low-basicity RH(Ruhrstahl-Hereaeus)slags.The composite material exhibits greater resistance to the RH slags than the traditional MgO-Cr2O3 composite,MgO-ZrO2 composite,and MgO-MgAl2O4-ZrO2 composite.On the basis of the microstructural analysis and mechanisms calculations,the corrosion resistance behavior of the MgO-MgAl2O4-ZrO2 composite is attributable to its highly dispersed structure,which helps protect the high activity of ZrO2.When in contact with the slag,ZrO2 reacts with CaO to form the stable phase CaZrO3,which protects MgAl2O4 against corrosion,thereby enhancing the corrosion resistance of the composite. 展开更多
关键词 highly dispersed MgO-MgAl2O4-ZrO2 composite material RH refining chrome-free refractory slag corrosion resistance
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Preparation and sintering of nanometer W-2 wt.% Y_2O_3 composite powders 认领 引用 被引量：3
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作者 李长记 刘实 +1 位作者 熊良银 王文涛 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第7期752-757,共6页
W-2 wt.%Y2O3 composite material with uniform distribution of yttrium element was fabricated through processes of mechanical alloying （MA） and spark plasma sintering （SPS）. The relevant productions were characteriz... W-2 wt.%Y2O3 composite material with uniform distribution of yttrium element was fabricated through processes of mechanical alloying （MA） and spark plasma sintering （SPS）. The relevant productions were characterized by scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS）, X-ray diffraction （XRD）, and transmission electron microscopy （TEM）. The XRD showed that the W-2 wt.%Y2O3 composite powder, including tungsten matrix and Y2O3 particles, was refined to nanometer sizes during the MA process. The SEM and TEM micrographs showed that the MA produced composite powder presented a lamellar morphology and contained many dislocations and microcracks. The EDS showed that the Y and O elements were uniformly distributed in the W matrix after mechanically alloying for 15 h. The W-2 wt.%Y2O3 composite material with uniform distribution of yttrium was obtained by sintering of the MA produced composite powder. 展开更多
关键词 W-2 wt.%Y2O3 composite material lamellar nanometer powder uniform distribution of Y MA SPS rare earths
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