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Confining shell-sandwiched Ag clusters in MnO_(2)-CeO_(2)Hollow spheres to boost activity and stability of toluene combustion

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Nano Research 2022年第8期15卷 7042-7051页

作者： Menglan Xiao Xueqin Yang Yue Peng Yucong Guo Yuechang Wei Maofa Ge Xiaolin Yu State Key Laboratory for Structural Chemistry of Unstable and Stable Species Beijing National Laboratory for Molecular Sciences(BNLMS)CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China College of Forestry Henan Agricultural UniversityZhengzhou 450002China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China School of Environment Tsinghua UniversityBeijing 100084China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China University of Chinese Academy of Sciences Beijing 100049China

Supported noble metal catalysts have the promising application in volatile organic compounds(VOCs)catalytic combustion but suffer from the deactivation due to noble metal sintering at high temperatures.Herein,we report the construction of shellsandwiched MnO_(2)-Ag-CeO_(2)Hollow spheres with remarkable sintering resistance and high activity in toluene combustion.Ag clusters were sandwiched between outer MnO_(2)and inner CeO_(2)shell to enlarge and stabilize metal–support active interface.The unique hollow structure could alter the electronic states of catalysts sites and increase the adsorbed site of reactant molecules.Meanwhile,Mn–Ag–Ce multi-interfaces in MnO_(2)-Ag-CeO_(2)could facilitate the sustainable activation and the stable release of oxygen species via a tandem transfer.The oxygen species at Ag–Mn interface perimeter were instantly replenished by Ag–Ce interface to accelerate a deep oxidation of intermediates,guaranteeing the opening of benzene ring to generate maleic anhydride.This investigation provides a promising method for constructing efficient and sintering-resistant cluster catalysts for VOCs oxidation.

关键词： Hollow spheres multi-interfaces toluene combustion active lattice oxygen

Fe_(2)Mo_(3)O_(8) nanoparticles self-assembling 3D mesoporous Hollow spheres toward superior lithium storage properties

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Frontiers of Chemical Science and Engineering 2021年第1期15卷 156-163页

作者： Lifeng Zhang Yifei Song Weiping Wu Robert Bradley Yue Hu Yi Liu Shouwu Guo School of Materials Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China Department of Electrical and Electronic Engineering School of MathematicsComputer Science and EngineeringCityUniversity of LondonLondonEC1V 0HBUK Department of Materials University of OxfordOxfordOX13PHUK MatSurf Technology Ltd. The Old Stables Marion LodgeCumbriaCA101NWUK School of Energy Resources University of WyomingLaramieWY 82071USA School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Unique self-assembled iron(II)molybdenum(IV)oxide(Fe_(2)Mo_(3)O_(8))mesoporous Hollow spheres have been facilely constructed via the bubble-template-assisted hydrothermal synthesis method combined with simple calcination.The compact assembly of small nanoparticles on the surface of the Hollow spheres not only provides more active sites for the Fe_(2)Mo_(3)O_(8),but also benefits the stability of the hollow structure,and thus improved the lithium storage properties of Fe2Mo3O8.The Fe_(2)Mo_(3)O_(8) mesoporous Hollow spheres exhibit high initial discharge and charge capacities of 1189 and 997 mA∙h∙g^(−1) respectively,as well as good long-term cycling stability(866 mA∙h∙g^(−1) over 70 cycles)when used as a lithium-ion battery anode.This feasible material synthesis strategy will inspire the variation of structural design in other ternary metal molybdates.

关键词： molybdates Fe_(2)Mo_(3)O_(8) Hollow spheres lithium ion batteries anodes

Synthesis and enhanced visible-light responsive of C,N,S-tridoped TiO_2 Hollow spheres

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Journal of Environmental Sciences 2013年第10期25卷 2150-2156页

作者： Xiaoxia Lin Degang Fu Lingyun Hao Zhen Ding School of Material Engineering Jinling Institute of Technology State Key Laboratory of Bioelectronics Southeast University Jiangsu Centers for Disease Control and Prevention

C,N,S-tridoped TiO2 Hollow spheres （labeled as C,N,S-THs） were synthesized using carbon spheres as template and C,N,S-tridoped TiO2 nanoparticles as building blocks. The structure and physicochemical properties of the catalysts were characterized by X- ray diffraction （XRD）, scanning electron microscopy （SEM）, UV-Vis diffuse reflectance spectrum （DRS）, N2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy （XPS） and Photoluminescence emission spectroscopy （PL）. The results showed that the Hollow spheres had average diameter of about 200 nm and the shell thickness was about 20 nm. The tridoped TiO2 Hollow spheres exhibited strong absorption in the visible-light region. C,N,S-tridoped could narrow the band gap of the THs by mixing the orbit O 2p with C 2p, N 2p and S 3p orbits and shift its optical response from ultraviolet （UV） to the visible-light region. PL analysis indicated that the electron-hole recombination rate of TiO2 Hollow spheres had been effectively inhibited when doped with C, N and S elements. The photocatalytic activities of the samples were evaluated for the degradation of X-3B （Reactive Brilliant Red dye, C.I. Reactive Red 2） aqueous solution under visible-light （λ 〉 420 nm） irradiation. It was found that the C,N,S-tridoped TiO2 Hollow spheres indicated higher photocatalytic activity than commercial P25 and the undoped counterpart photocatalyst.

关键词： titania C,N,S-tridoped Hollow spheres visible-light photocatalysis

Preparation and performance of CeO_2 Hollow spheres and nanoparticles

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Journal of Rare Earths 2016年第3期34卷 295-299页

作者：张问问陈东辉 College of Chemical and Environmental Engineering Shanghai Institute of Technology

CeO_2 Hollow spheres were synthesized by polystryrene sphere（PS） templates and CeO_2 nanoparticles were prepared by a facile method. The as-obtained products were characterized by scanning electron microscopy（SEM）, N_2 adsorption-desorption, X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FTIR） and UV-vis diffuse reflectance spectra. The results showed that the structure of the obtained CeO_2 Hollow spheres was hollow microsphere with a diameter of 380 nm and the average particle size of CeO_2 nanoparticles was about 1700 nm. The two samples＇ Brunauer-Emmett-Teller（BET） surface area was 67.1 and 37.2 m^2/g. The CeO_2 Hollow spheres had a better performance than nanoparticles at UV-shielding because of higher surface area and the structure of hollow sphere.

关键词： CeO2 UV-shielding Hollow spheres template Rh B rare earths

One-step synthesis of hierarchically porous hybrid TiO2 hollow spheres with high photocatalytic activity

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Frontiers of Materials Science 2016年第1期10卷 15-22页

作者： Ruiping LIU Feng REN Jinlin YANG Weiming SU Zhiming SUN Lei ZHANG Chang-an WANG Department of Materials Science and Engineering China University of Mining & Technology (Beijing) Beijing 100083 China School of Chemical & Environmental Engineering China University of Mining & Technology (Beijing) Beijing 100083 China Department of Mechanical Engineering PO Box 755905 University of Alaska Fairbanks Fairbanks AK 99775 USA School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Tsinghua University Beijing 100084 China

Hierarchically porous hybrid TiO2 Hollow spheres were solvothermally synthesized successfully by using tetrabutyl titanate as titanium precursor and hydrated metal sulfates as soft templates. The as-prepared TiO2 spheres with hierarchically pore structures and high specific surface area and pore volume consisted of highly crystallized anatase TiO2 nanocrystals hybridized with a small amount of metal oxide from the hydrated sulfate. The proposed hydrated-sulfate assisted solvothermal （HAS） synthesis strategy was demonstrated to be widely applicable to various systems. Evaluation of the hybrid TiO2 Hollow spheres for the photo-decomposition of methyl orange （MO） under visible-light irradiation revealed that they exhibited excellent photocatalytic activity and durability.

关键词： titania hybrid composite Hollow spheres photocatalytic property

Controllable synthesis,characterization,and growth mechanism of hollow Zn_x Cd_(1-x) S spheres generated by a one-step thermal evaporation method

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Chinese Physics B 2013年第10期22卷 571-574页

作者：杨再兴钟伟區澤棠都有为 Nanjing National Laboratory of Microstructures and Department of Physics Nanjing University Department of Physics and Materials Science City University of Hong Kong Chemistry Department Hong Kong Baptist University

Novel hollow ZnxCdl xS spheres that are uniform in size are synthesized through the one-step thermal evaporation of a mixture of Zn and CdS powder. From an X-ray diffraction （XRD） study, the hexagonal wurtzite phase of ZnxCdl_xS is verified, and the Zn mole fraction （x） is determined to be 0.09. According to the experimental results, we propose a mechanism for the growth of Zn0.09Cd0.91S Hollow spheres. The results of the cathodoluminescence investigation indicate uniform Zn, Cd, and S distribution of alloyed Zn0.09Cd0.91S, instead of separate CdS, ZnS, or nanocrystals of a core- shell structure. To the best of our knowledge, the fabrication of ZnxCd1-xS Hollow spheres of this kind by one-step thermal evaporation has never been reported. This work would present a new method of growing and applying Hollow spheres on Si substrates, and the discovery of the Zn0.09Cd0.91S Hollow spheres would make the investigation of ZnxCd1-xS micro/nanostructures more interesting and intriguing.

关键词： ZnxCd1-xS Hollow spheres semiconductors vapour deposition growth mechanism

Fluidized bed coating efficiency and morphology of coatings for producing Al-based nanocomposite Hollow spheres

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International Journal of Minerals,Metallurgy and Materials 2014年第11期21卷 1146-1151页

作者： Mostafa Amirjan Hamid Khorsand Manouchehr Khorasani Faculty of Materials Science and Engineering K. N. Toosi University of TechnologyP.O. Box 15875-4416 Tehran Iran Color and Polymer Research Center (CPRC) Amirkabir University of TechnologyP.O. Box 15875-4413 Tehran Iran

Abstract： We performed fluidized bed coating ofAl-based nanoeomposite powder-binder suspensions onto polymer substrates. The effects of the type and amount of the binder and nanoparticle additive on the coating process efficiency and coating characteristics were investigated. The efficiency decreased from 52% to 49% as the processing time increased from 15 to 20 min. However, the amount and thickness of the coating also increased as the processing time and amount of the binder were increased. The addition of nanoparticles to the system decreased the thickness of the coating from 222 to 207 μm when polyvinyl alcohol （PVA） was used as a binder. The suspension containing 3wt% R-4410 binder exhibited the greatest efficiency of 60%.

关键词： fluidized bed coating aluminum nanocomposites efficiency nanoparticles Hollow spheres binders

TiO_2-coated SnO_2 Hollow spheres as anode materials for lithium ion batteries

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Rare Metals 2011年第6期30卷 589-594页

作者： YI Jin LI Xiaoping HU Shejun LI Weishan ZENG Ronghua FU Zhao CHEN Lang School of Chemistry and Environment South China Normal University Guangzhou 510006 China Key Laboratory of Electrochemtcal Technology on Energy Storage and Power Generation of Guangdong Higher Education Institutes Guangzhou 510006 China Engineering Research Center of Materials and Technology for Electrochemical Energy Storage Ministry of Education Guangzhou 510006 China

TiO2-coated SnO2 （TCS） Hollow spheres, which are new anode materials for lithium ion （Li-ion） batteries, were prepared and characterized with X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, cyclic voltammetry （CV）, and galvanostatic charge/discharge tests. The results obtained from XRD, SEM, and TEM show that TiO2 can be uniforrrdy coated on the surface of SnO2 Hollow spheres with the assistance of anionic surfactant. The cyclic voltammograms indicate that both TiO2 and SnO2 exhibit the activity for Li-ion storage. The charge/discharge tests show that the prepared TCS Hollow spheres have a higher reversible coulomb efficiency and a better cycling stability than the uncoated SnO2 Hollow spheres.

关键词： TiO2-coated SnO2 Hollow spheres anode lithium ion batteries

Preparation of CaCO_3 Hollow spheres in an Aqueous Binary-additive System

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Chinese Journal of Structural Chemistry 2009年第2期28卷 151-156页

作者：张群陈传宝方亮 Key Provincial Laboratories Anqing Normal CollegeAnqing 246011 China College of Chemistry and Material Science Anhui Normal UniversityWuhu 241000 China

CaCO3 Hollow spheres were prepared easily in anion surfactants （sodium dodecylbenzenesulfonate （SDBS）） and aspartic （Asp） acid binary-additive system by using an easy rapid agitation method. The as-prepared products were characterized with scanning electron microscopy （SEM）, FT-IR and X-ray diffraction. The results suggested that the CaCO3 Hollow spheres have diameters ranging from 1 to 2 μm, and their wall is constituted of many nano-particles. Moreover, the possible formation mechanism of the hollow spherical structure was proposed.

关键词： Hollow spheres complex micelles CaCO3