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CeO_(2) doping boosted low-temperature NH3-SCR activity of FeTiOx catalyst:A microstructure analysis and reaction mechanistic study

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Frontiers of Environmental Science & Engineering 2022年第5期16卷 69-81页

作者： Wei Tan Shaohua Xie Wenpo Shan Zhihua Lian Lijuan Xie Annai Liu Fei Gao Lin Dong Hong He Fudong Liu Department of Civil Environmentaland Construction EngineeringCatalysis Cluster for Renewable Energy and Chemical Transformations(REACT)NanoScience Technology Center(NSTC)University of Central FloridaOrlandoFL32816USA Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringJiangsu Key Laboratory of Vehicle Emissions ControlSchool of EnvironmentCenter of Modern AnalysisNanjing UniversityNanjing 210023China State Key joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Institute of Engineering Technology Sinopec Catalyst Co.Ltd.Sinopec GroupBeijing 101111China

FeTiOx has been recognized as an environmental-friendly and cost-effective catalyst for selective catalytic reduction(SCR)of NOx with *** at further improving the low-temperature DeNOx efficiency of FeTiOx catalyst,a simple strategy of CeO_(2) doping was *** low-temperature(<250°C)NH3-SCR activity of FeTiOx catalyst could be dramatically enhanced by CeO2 doping,and the optimal composition of the catalyst was confirmed as FeCe_(0.2)TiOx,which performed a NOx conversion of 90%at ca.200°*** to X-ray diffraction(XRD),Raman spectra and X-ray absorption fine structure spectroscopy(XAFS)analysis,FeCe_(0.2)TiOx showed low crystallinity,with Fe and Ce species well mixed with each *** on the fitting results of extended X-ray absorption fine structure(EXAFS),a unique Ce-O-Fe structure was formed in FeCe_(0.2)TiOx *** well improved specific surface area and the newly formed Ce-O-Fe structure dramatically contributed to the improvement of the redox property of FeCe_(0.2)TiOx catalyst,which was well confirmed by H2-temperature-programmed reduction(H2-TPR)and in situ XAFS *** enhanced redox capability could benefit the activation of NO and NH_(3) at low temperatures for NOx *** detailed reaction mechanism study further suggested that the facile oxidative dehydrogenation of NH_(3) to highly reactive-NH_(2) played a key role in enhancing the low-temperature NH_(3)-SCR performance of FeCe_(0.2)TiOx catalyst.

关键词： NH3-SCR CeO_(2)doping Low-temperature NOx removal Improved redox property In situ XAFS analysis

The modulating effect of N coordination on single-atom catalysts researched by Pt-N_(x)-C model through both experimental study and DFT simulation

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Journal of Materials Science & Technology 2021年第32期91卷 160-167页

作者： Mengmeng Fan Jiewu Cui Junjie Zhang Jingjie Wu Shuangming Chen Li Song Zixing Wang Ao Wang Robert Vajtai Yucheng Wu Pulickel MAjayan Jianchun Jiang Dongping Sun Nanjing Forestry University Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest ResourcesCollege of Chemical EngineeringNanjing 210037China Rice University Department of Materials Science and NanoEngineeringHoustonTX 77005USA Hefei University of Technology School of Materials Science and EngineeringHefei 230009China University of Cincinnati Department of Chemical and Environmental EngineeringCincinnatiOH 45221USA University of Science and Technology of China National Synchrotron Radiation LaboratoryCAS Center for Excellence in NanoscienceHefei 230026China Nanjing University of Science and Technology Chemicobiology and Functional Materials InstituteNanjing 210094China Key Lab of Biomass Energy and Material Jiangsu ProvinceJiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesInstitute of Chemical Industry of Forest ProductsChinese Academy of ForestryNanjing 210042China

N-doped carbon-based single-atom catalysts(NC-SACs) are widely researched in various electrochemical reactions due to high metal atom utilization and catalytic *** catalytic activity of NC-SACs originates from the coordinating structure between single metal site(M) and the doped nitrogen(N) in carbon matrix by forming M-N_(x)-C structure(1≤x≤4).The M-N4-C structure is widely considered to be the most stable and effective catalytic ***,there is no in-depth research for the "x" modulation in Pt-Nx-C structure and the corresponding catalytic ***,atomically dispersed Pt on N-doped carbon(Pt-NC) with Pt-Nx-C structure(1≤x≤4),as a research model,is fabricated by a ZIF-8 template and applied to catalytic oxygen *** carbonization temperatures are used to control N loss,and then modulate the N coordination of Pt-Nx-C *** Pt-NC has the predictable low half-wave potential(E_(1/2)) of 0.72 V vs RHE compared to the Pt/C 20% of 0.81 V due to low Pt ***,the Pt-NC shows a high onset potential(1.10 V vs RHE,determined for j=-0.1 mA cm^(2)) and a high current density of 5.2 mA cm^(-2),more positive and higher than that of Pt/C 20%(0.96 V) and 4.9 mA cm^(-2),*** the structural characterization and DFT simulation confirmed,the reducing PtN coordination number induces low valence of Pt atoms and low free energy of oxygen reduction,which is responsible for the improved catalytic ***,the Pt-NC shows high mass activity(172 times higher than that of Pt/C 20%),better stability and methanol crossover resistance.

关键词： Modulating effect N coordination Single-atom catalysts Pt-N_(x)-C model DFT simulation

Pd/silicalite-1: An highly active catalyst for the oxidative removal of toluene

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Journal of Environmental Sciences 2022年第6期34卷 209-219页

作者： Linke Wu Jiguang Deng Yuxi Liu Lin Jing Xiaohui Yu Xing Zhang Ruyi Gao Wenbo Pei Xiuqing Hao Ali Rastegarpanah Hongxing Dai Beijing Key Laboratory for Green Catalysis and Separation Key Laboratory of Beijing on Regional Air Pollution ControlKey Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaLaboratory of Catalysis Chemistry and NanoscienceDepartment of Environmental Chemical EngineeringSchool of Environmental and Chemical EngineeringFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China

Catalytic combustion is thought as an efficient and economic pathway to remove volatile organic compounds, and its critical issue is the development of high-performance catalytic materials. In this work, we used the in situ synthesis method to prepare the silicalite-1(S-1)-supported Pd nanoparticles(NPs). It is found that the as-prepared catalysts displayed a hexagonal prism morphology and a surface area of 390-440 m^(2)/g. The sample(0.28Pd/S-1-H)derived after reduction at 500°C in 10 vol% H_(2)showed the best catalytic activity for toluene combustion(T50%= 180℃ and T90%= 189℃ at a space velocity of 40,000 m L/(g·hr), turnover frequency(TOFPd) at 160℃ = 3.46 × 10^(-3)sec^(-1), and specific reaction rate at 160℃ = 63.8μmol/(gPd·sec)), with the apparent activation energy(41 k J/mol) obtained over the bestperforming 0.28Pd/S-1-H sample being much lower than those(51-70 k J/mol) obtained over the other samples(0.28Pd/S-1-A derived from calcination at 500℃ in air, 0.26Pd/S-1-im derived from the impregnation route, and 0.27Pd/ZSM-5-H prepared after reduction at 500℃ in 10 vol% H_(2)). Furthermore, the 0.28Pd/S-1-H sample possessed good thermal stability and its partial deactivation due to CO_(2) or H_(2)O introduction was reversible, but SO_(2) addition resulted in an irreversible deactivation. The possible pathways of toluene oxidation over 0.28Pd/S-1-H was toluene → p-methylbenzoquinone → maleic anhydride, benzoic acid, benzaldehyde → carbon dioxide and water. We conclude that the good dispersion of Pd NPs, high adsorption oxygen species concentration, large toluene adsorption capacity, strong acidity,and more Pd~0 species were responsible for the good catalytic performance of 0.28Pd/S-1-H.

关键词： Silicalite-1 Hexagonal prism shape Supported palladium catalyst Volatile organic compound Toluene combustion

Mass-production of flexible and transparent Te-Au nylon SERS substrate with excellent mechanical stability

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Nano Research 2019年第6期12卷 1483-1488页

作者： Wei-Ran Huang Cheng-Xin Yu Yi-Ruo Lu Hassan Muhammad Jin-Long Wang Jian-Wei Liu Shu-Hong Yu Division of Nanomaterials & Chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleCAS Center for Excellence in NanoscienceHefei Science Center of CASCollaborative Innovation Center of Suzhou Nano Science and TechnologyDepartment of ChemistryUniversity of Science and Technology of ChinaHefei 230026China school of Physics and Materials Science Anhui UniversityHefei 230601China

In the past two decades,the field of surface-enhanced Raman scattering (SERS) has flourished and many rational strategies have been reported for the successful construction of SERS ***,it still lacks the mass-production and programmability for practical applications with arbitrary configurations,and it is highly desirable to develop SERS substrates with strong signal enhancement,large-scale surface area,easy fabrication and low ***,we demonstrate a large-area fabrication (1.5 m × 5 m) of low-cost (18.8 dollars per square meter),highly sensitive,flexible and transparent SERS substrate by a simple solution *** high sensitivity of SERS substrate using 3,3'-diethylthiatricarbocyanine iodide (DTTCI) as probe molecules is strongly dependent on the density and diameter of gold nanoparticles (NPs) on the surface of nylon mesh with the best enhancement factor (EF) of 9.17 × 10^10 and the SERS detection limit of DTTCI molecules is as low as 10-14 M which shows no obvious degradation even after 10,000 cycles of fatigue test,high temperature (above than 160 ℃) and acid-alkali treatment,indicating their excellent stability for the performance in all climates.

关键词： mass-production flexible transparent surface-enhanced Raman scattering gold nanoparticles

Ultrahard BCC-AlCoCrFeNi bulk nanocrystalline high-entropy alloy formed by nanoscale diffusion-induced phase transition

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Journal of Materials Science & Technology 2022年第20期115卷 29-39页

作者： Junjie Wang Zongde Kou Shu Fu Shangshu Wu Sinan Liu Mengyang Yan Zhiqiang Ren Di Wang Zesheng You Si Lan Horst Hahn Xun-Li Wang Tao Feng Herbert Gleiter Institute of nanoscience School of Material Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Institute of Nanotechnology Karlsruhe Institute of TechnologyKarlsruhe 76021Germany Department of Physics City University of Hong KongHong KongChina Center for Neutron Scattering Shenzhen Research InstituteCity University of Hong KongShenzhen 518057China

In the current work,the BCC-AlCoCrFeNi bulk nanocrystalline high-entropy alloy(nc-HEA)with ultrahigh hardness was formed by nanoscale diffusion-induced phase transition in a ***,a dual-phase Al/CoCrFeNi nanocrystalline high-entropy alloy composite(nc-HEAC)was prepared by a laser source inert gas condensation equipment(laser-IGC).The as-prepared nc-HEAC is composed of well-mixed FCC-Al and FCC-CoCrFeNi ***,the heat treatment was used to trigger the interdiffusion between Al and CoCrFeNi nanocrystals and form an FCC-AlCoCrFeNi *** the increase of the annealing temperature,element diffusion intensifies,and the Al Co Cr Fe Ni phase undergoes a phase transition from FCC to BCC ***,the BCC-AlCoCrFe Ni bulk nc-HEA with high Al content(up to 50 at.%)was obtained for the first ***,the nc-HEAC(Al-40%)sample exhibits an unprecedented ultra-high hardness of 1124 HV after annealing at 500℃ for 1 *** present a systematic investigation of the relationship between the microstructure evolution and mechanical properties during annealing,and the corresponding micro-mechanisms in different annealing stages are *** enhanced nanoscale thermal diffusion-induced phase transition process dominates the mechanical performance evolution of the nc-HEACs,which opens a new pathway for the design of high-performance nanocrystalline alloy materials.

关键词： High-entropy alloy Nanocrystalline Composites Diffusion-induced phase transition Mechanical Inert gas condensation

Advanced tools and methods for single-cell surgery

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Microsystems & nanoengineering 2022年第2期8卷 1-21页

作者： Adnan Shakoor Wendi Gao Libo Zhao Zhuangde Jiang Dong Sun Department of Biomedical Engineering City University of Hong KongHong KongChina State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesThe School of Mechanical EngineeringXi'an Jiaotong UniversityXi'anChina

Highly precise micromanipulation tools that can manipulate and interrogate cell organelles and components must be developed to support the rapid development of new cell-based medical therapies,thereby facilitating in-depth understanding of cell dynamics,cell component functions,and disease *** paper presents a literature review on micro/nanomanipulation tools and their control methods for single-cell *** methods specifically based on laser,microneedle,and untethered micro/nanotools are presented in *** limitations of these techniques are also *** biological significance and clinical applications of single-cell surgery are also addressed in this paper.

关键词： manipulation surgery needle

A thick yet dense silicon anode with enhanced interface stability in lithium storage evidenced by in situ TEM observations

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Science Bulletin 2020年第18期65卷 1563-1569,M0004页

作者： Junwei Han Dai-Ming Tang Debin Kong Fanqi Chen Jing Xiao Ziyun Zhao Siyuan Pan Shichao Wu Quan-Hong Yang Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin 300350China International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)Namiki 1-1Tsukubalbaraki 305-0044Japan CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China joint school of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China

Increasing the density and thickness of electrodes is required to maximize the volumetric energy density of lithium-ion batteries for practical ***,dense and thick electrodes,especially highmass-content(>50 wt%) silicon anodes,have poor mechanical stability due to the presence of a large number of unstable interfaces between the silicon and conducting components during *** we report a network of mechanically robust carbon cages produced by the capillary shrinkage of graphene hydrogels that can contain the silicon nanoparticles in the cages and stabilize the silicon/carbon *** situ transmission electron microscope characterizations including compression and tearing of the structure and lithiation-induced silicon expansion experiments,have provided insight into the excellent confinement and buffering ability of this interface-strengthened graphene-caged silicon nanoparticle anode ***,a dense and thick silicon anode with reduced thickness fluctuations has been shown to deliver both high volumetric(>1000 mAh cm^-3) and areal(>6 mAh cm^-2)capacities together with excellent cycling capability.

关键词： Lithium-ion battery Silicon anode Interface stability In situ TEM Dense and thick electrodes

Professor Zhifang Chai:Scientific contributions and achievements

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Chinese Chemical Letters 2022年第7期33卷 3297-3302页

作者： Yuliang Zhao Chunying Chen Weiyue Feng Zhiyong Zhang Diandou Xu Weiqun Shi Shuao Wang Yu-Feng Li CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety&CAS Center for Excellence in nanoscience National Centre for Nanoscience and TechnologyBeijing 100191China CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety&CAS-HKU joint Laboratory of Metallomics on Health and Environment&Beijing Metallomics Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Division of Research and Planning Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Laboratory of Nuclear Energy Chemistry Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123China

*** Chai,born in October 1942,is a radioanalytical chemist working at the Institute of High Energy Physics,Chinese Academy of Sciences and Soochow *** graduated from Fudan University in *** an Alexander von Humboldt F... 详细信息

关键词： contributions fellow graduate

Tribotronic bipolar junction transistor for mechanical frequency monitoring and use as touch switch

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Microsystems & nanoengineering 2018年第1期4卷 65-72页

作者： Fengben Xi Yaokun Pang Wenjian Li Tianzhao Bu Junqing Zhao Guoxu Liu Tong Guo Wenbo Liu Chi Zhang CAS Center for Excellence in nanoscience Beijing Key Laboratory of Micronano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of Sciences100083 BeijingChina school of nanoscience and Technology University of Chinese Academy of Sciences100049 BeijingChina

Tribotronics,a new field that involves the coupling of triboelectricity and semiconductors,has attracted great interest in the nanoenergy and nanoelectronics *** paper proposes a tribotronic bipolar junction transistor(TBJT)that incorporates a bipolar junction transistor and a triboelectric nanogenerator(TENG)in the single-electrode *** the mobile triboelectric layer slides on the device surface for electrification,a bias voltage is created and applied to the emitter junction,and then the base current from the TENG is *** on the fabricated TBJT,a mechanical frequency monitoring sensor with high sensitivity and excellent stability and a finger-triggered touch switch were *** work demonstrated for the first time a tribotronic device with simultaneously controlled voltage and current voltage/current simultaneously controlled tribotronic device,which has promising potential applications in micro/nano-sensors,human-machine interactions,intelligent instrumentation,wearable electronics,and other applications.

关键词： bipolar transistor junction