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Synthesis of photocatalytic La_(1–x)A_xTiO_(3.5–δ)(A=Ba, Sr, Ca) nano perovskites and their application for photocatalytic oxidation of congo red dye in aqueous solution

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Journal of Rare Earths 2015年第2期33卷 160-167页

作者： M.Bradha T.Vijayaraghavan S.P.Suriyaraj R.Selvakumar Anuradha M.Ashok Nanotech Research facility PSG Institute of Advanced StudiesCoimbatore-641 004 India Nanobiotechnology Laboratory PSG Institute of Advanced StudiesCoimbatore-641 004 India

A-site substituted La0.8A0.2TiO3.5–δ（A=Ba, Sr, Ca） nano perovskites were prepared by sol-gel method and characterized using thermogravimetry/differential thermal analysis（TGA/DTA）, X-ray diffraction（XRD）, ultraviolet-visible（UV-Vis） spectroscopy and transmission electron microscopy（TEM）. XRD analysis showed that the La0.8A0.2TiO3.5–δ（A=Ba, Sr, Ca） nano perovskites derived after calcination at 800 oC were in single phase with orthorhombic structure. The particle size of all nano perovskites was found to be ~20 nm. The synthesized nano perovskites were tested for the photocatalytic decomposition of an azo dye, Congo red. The sequential behavior of La0.8A0.2TiO3.5–δ（A=Ba, Sr, Ca） nanoperovskites for photocatalytic decomposition of congo red in aqueous solution by visible light at room temperature was studied at various time intervals and the efficiency of degradation of the nanoperovskites was compared. Among all the A-site substituted La0.8A0.2TiO3.5–δ（A=Ba, Sr, Ca） nano perovskites, Ba substituted compound showed the highest dye degradation.

关键词： nano perovskite oxidation photocatalyst congo red dye degradation rare earths

Improving oxidation resistance of Ni-16Mo-7Cr-4Fe nickel-based superalloy by yttrium microalloying

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Nuclear Science and Techniques 2015年第3期26卷 33-39页

作者：李晓丽何上明周兴泰李志军邹杨李爱国余笑寒 Shanghai Institute of Applied Physics China Academy of Sciences Shanghai Synchrotron Radiation facility (SSRF) Shanghai Institute of Applied PhysicsChinese Academy of Sciences

Microstructure and oxidation behavior of modified Ni-16Mo-7Cr-4Fe alloys by yttrium microalloying were investigated by scanning electron microscopy, transmission electron microscopy, grazing incident Xray diffraction and synchrotron radiation X-ray fluorescence. M6 C and Ni17Y2 phases were observed and the amount of Ni17Y2 increased with yttrium concentration. When the yttrium concentration increased to 0.43 wt.%,some Ni17Y2 chains and multi phase regions containing Ni17Y2, M6 C and γ phase appeared, which is harmful for the oxidation resistance. The alloy containing 0.05 wt.% yttrium showed the best oxidation resistance, which derives its oxidation resistance from the adequate concentration of yttrium in the solid-solution(γ phase), the formation of the protective layer of YCr O3 and chromia oxide and the strengthening effect of yttrium on oxide boundaries.

关键词：氧化性能微合金化钇合金镍基高温合金同步辐射X射线荧光掠入射X射线衍射扫描电子显微镜透射电子显微镜

Atomic iron on mesoporous N-doped carbon to achieve dehydrogenation reaction at room temperature

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Nano Research 2020年第11期13卷 3075-3081页

作者： Zheng Chen Wenjuan Yang Yue Wu Chao Zhang Jun Luo Chen Chen Yadong Li Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Key Laboratory of Molecule-Based MaterialsCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu241000China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen518060China Department of Chemistry Tsinghua UniversityBeijing100084China View author publications Center for electron microscopy Tianjin University of TechnologyTianjin300384China

Atomic non-noble metal materials show the potential to substitute noble metals in ***,melamine formaldehyde resin is developed to synthesize atomic iron on mesoporous nitrogen-doped *** triazine units with abundant nitrogen content and cavity can realize effectively anchoring of single metal *** atomic iron with unique charge and coordination characteristics shows superior catalytic performance in dehydrogenation *** N-heterocycles compounds and amines can be efficiently dehydrogenated into the corresponding products at room temperature,which is the mildest of all reported reaction conditions even when noble metal catalysts are ***,development of atomic non-noble metal catalysts with mesoporous structure may provide an effective way to realize the substitution for noble metals in heterogeneous catalysis.

关键词： atomic dispersion non-noble metal nitrogen-doped carbon mesoporous structure dehydrogenation

Comprehensive study of a versatile polyol synthesis approach for cathode materials for Li-ion batteries

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Nano Research 2019年第9期12卷 2238-2249页

作者： Hyeseung Chung Antonin Grenier Ricky Huang Xuefeng Wang Zachary Lebens-Higgins Jean-Marie Doux Shawn Sallis Chengyu Song Peter Ercius Karena Chapman Louis F.J.Piper Hyung-Man Cho Minghao Zhang Ying Shirley Meng Department of NanoEngineering University of CaliforniaSan DiegoLa JollaCA 92093USA Chemistry Department Stony Brook UniversityStony BrookNY 11794USA Department of Physics Applied Physics and AstronomyBinghamton UniversityBinghamtonNY 13902USA Advanced Light Source Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeleyCA 94720USA National Center for electron microscopy Molecular FoundryLawrence Berkeley National LaboratoryBerkeleyCA 94720USA

This work reports a comprehensive study of a novel polyol method that can successfully synthesize layered LiNi0.4Mn0.4Co0.2O2,spinel LiNi0.5Mn1.5O4,and olivine LiCoPO4 cathode *** properly designed,polyol method offers many advantages such as low cost,ease of use,and proven scalability for industrial *** importantly,the unique properties of polyol solvent allow for greater morphology control as shown by all the resulting materials exhibiting monodispersed nanoparticles *** morphology contributes to improved lithium ion transport due to short diffusion ***-synthesized LiNi0.4Mn0.4Co0.2O2 delivers a reversible capacity of 101 and 82 mAh.g-1 using high current rate of 5C and 10C,*** also displays surprisingly high surface structure stability after chargedischarge *** step of the reaction was investigated to understand the underlying polyol synthesis mechanism.A combination of in situ and ex situ studies reveal the structural and chemical transformation of Ni-Co alloy nanocrystals overwrapped by a Mn-and Li-embedded organic matrix to a sedes of intermediate phases,and then eventually to the desired layered oxide phase with a homogeneous distribution of Ni,Co,and *** envisage that this type of analysis will promote the development of optimized synthesis protocols by establishing links between experimental factors and important structural and chemical properties of the desired *** insights can open a new direction of research to synthesize high-performance intercalation compounds by allowing unprecedented control of intermediate phases using experimental parameters.

关键词： polyol cathode synthesis nanoparticle LiNi0.4Mn0.4Co0.2O2(NMC)

Outer delocalized electron aggregation of bromide bridged core–shell CuBr@C for hydrogen evolution reaction

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Nano Research 2023年第5期16卷 6608-6614页

作者： Tianyi Xu Ruoyu Li Lei Zhang Dongxu Jiao Yilong Dong Ming Gong Dantong Zhang Jinchang Fan Dewen Wang Yanhua Liu Xiao Zhao Wei Zhang Weitao Zheng Xiaoqiang Cui State Key Laboratory of Automotive Simulation and Control School of Materials Science and EngineeringKey Laboratory of Automobile Materials of MOEJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsElectron Microscopy CenterJilin UniversityChangchun 130012China College of Chemistry Jilin UniversityChangchun 130012China Center of Multiscale Crystal Materials Research Institute of Advanced Materials Science and EngineeringShenzhen Intitute of Advanced TechnologyChinese Academy of ScienceShenzhen 518055China

Modulation of the surface electron distribution is a challenging problem that determines the adsorption ability of catalytic ***,we address this challenge by bridging the inner and outer layers of the core–shell structure through the bridge Br *** shell wrapped copper bromide nanorods(CuBr@C)are constructed for the first time by chemical vapour deposition with hexabromobenzene(HBB).HBB pyrolysis provides both bridge Br atom and C *** C shell protects the stability of the internal halide structure,while the bridge Br atom triggers the rearrangement of the surface electrons and exhibits excellent electrocatalytic ***,the hydrogen evolution reaction(HER)activity of CuBr@C is significantly better than that of commercial N-doped carbon nanotubes,surpassing commercial Pt/C at over 200 mA·cm^(−2).Density functional theory(DFT)calculations reveal that bridge Br atoms inspire aggregation of delocalized electrons on C-shell surfaces,leading to optimization of hydrogen adsorption energy.

关键词： bridge Br atoms delocalized electron aggregation core–shell nanorods C-shell wrapped CuBr hydrogen evolution reaction

Characterizations in nanotoxicology and nanomedicine development:A regulatory perspective

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Characterizations in nanotoxicology and nanomedicine develop...

Engineering single atomic ruthenium on defective nickel vanadium layered double hydroxide for highly efficient hydrogen evolution

中国毒理学会第六届全国毒理学大会

作者： ZHANG Yong-bin William SALMINEN SHI Qiang YANG Xi Yvonne JONES Paul HOWARD NCTR/ORA Nanotechnology core facility Food and Drug Administration Division of Systems Biology National Center for Toxicological ResearchFood and Drug Administration

＜正＞With the rapid expansion of nanotechnology,there has been great concern on safety issue of the nano-product regulated by U.S Food and Drug Administration（FDA）.Pre-clinical characterization and quality control during the manufacturing of nano-products is fundamental for understanding resulting safety issues during their wide *** regulated products are required to submit basic physio-chemical characterization as part of Investigational New Drug（IND） Applications or New Drug Applications（NDA） submitted to the FDA for *** of gold nanoparticles（Au NPs）, silver nanoparticles（Ag NPs） and single walled carbon nanotubes（SWCNTs） will be discussed as cases *** nanomaterials were characterized using transmission electron microscopy（TEM）,dynamic light scattering（DLS）,Raman,and hyperspectral microscopy and other spectroscopy techniques. We examined their uptake and toxicity in primary rat hepatocytes,rat adrenal pheochromocytoma cells（PC12） or in vivo rodent *** was assessed by examining cell membrane integrity and mitochondrial activity（LDH,XTT and MTT assay） and oxidative stress（DCF assay;reduced glutathione levels;PCR array for ROS responsive gene expression）.Uptake and subcellular localization were monitored using TEM,confocal Raman microscopy and inductively coupled plasma mass spectrometry（ICP-MS） *** Au NPs were taken up by the cells in a time- and size-dependent manner,no cytotoxicity or ROS stress was ***,uptake of SWCNT was cytotoxic and generated ROS in surface coating-dependent *** SWCNT exhibited less potency than uncoated *** the other hand,Ag NPs decreased the body weight and locomotor activities after intravenous exposure in *** studies suggest the surface coating,size and composition play import roles in toxicity of the *** multiple characterization approaches used in this study provided the solid basis to understand the biological resp

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Nano Research 2023年第4期16卷 4612-4619页

作者： Xiaoyu Chen Jiawei Wan Meng Zheng Jin Wang Qinghua Zhang Lin Gu Lirong Zheng Xianzhu Fu Ranbo Yu College of Materials Science and Engineering Shenzhen UniversityShenzhen 518071China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing InstitutionBeijing 100083China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Beijing National Center for electron microscopy and Laboratory of Advanced Materials Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Beijing Synchrotron Radiation facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Key Laboratory of Advanced Material Processing&Mold Ministry of EducationZhengzhou UniversityZhengzhou 450002China

Fabricating single-atom catalysts(SACs)with high catalytic activity as well as great stability is a big ***,we propose a precise synthesis strategy to stabilize single atomic ruthenium through regulating vanadium defects of nickel vanadium layered double hydroxides(NiV-LDH)ultrathin nanoribbons ***,the isolated atomically Ru doped NiV-LDH ultrathin nanoribbons(NiVRu-R)were successfully fabricated with a super-high Ru load of 12.8 wt.%.X-ray absorption spectrum(XAS)characterization further confirmed atomic dispersion of *** catalysts for electrocatalytic hydrogen evolution reaction(HER)in alkaline media,the NiVRu-R demonstrated superior catalytic properties to the commercial Pt/***,it maintained exceptional stability even after 5,000 cyclic voltammetry ***-situ XAS and density functional theory(DFT)calculations prove that the Ru atomic sites are stabilized on supports through forming the Ru-O-V structure,which also help promote the catalytic properties through reducing the energy barrier on atomic Ru catalytic sites.

关键词： hydrogen evolution reaction layered double hydroxide ruthenium atomic site ultrathin nanoribbons

Sample spinning to mitigate polarization artifact and interstitial-vacancy imbalance in ion-beam irradiation

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npj Computational Materials 2020年第1期6卷 107-117页

作者： Cui-Lan Ren Yang Yang Yong-Gang Li Ping Huai Zhi-Yuan Zhu Ju Li Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA Key Laboratory of Interfacial Physics and Technology Chinese Academy of SciencesShanghai 201800China National Center for electron microscopy Molecular FoundryLawrence Berkeley National LaboratoryBerkeleyCA 94720USA Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Synchrotron Radiation facility Shanghai Advanced Research InstituteShanghai 201204China Department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

Accelerator-based ion-beam irradiation has been widely used to mimic the effects of neutron radiation damage in nuclear ***,ion radiation is most often monodisperse in the incoming ions’momentum direction,leading to excessive polarization in defect distribution,while the scattering under neutron irradiation is often more isotropic and has less radiation-induced *** of the excess-polarization as well as the damage non-uniformity artifact might be crucial for making the simulation of neutron radiation by ion-beam radiation more *** this work,a general radiation polarization theory in treating radiation as external polar stimuli is established to understand the natural material responses in different contexts,and the possibility to correct the defect polarization artifact in ion-beam *** by Magic Angle Spinning in Nuclear Magnetic Resonance,we present a precise sample spinning strategy to reduce the point-defect imbalance effect in ion-beam *** can be seen that with optimized surface inclination angle and the axis of sample rotation,the vacancy-interstitial population imbalance,as well as the damage profile non-uniformity in a designated region in the target are both *** is estimated that sample spinning frequency on the order of kHz should be sufficient to scramble the ion momentum monodispersity for commonly taken ion fluxes and dose rates,which is experimentally feasible.

关键词： beam vacancy momentum

Direct production of hydrogen peroxide over bimetallic CoPd catalysts:Investigation of the effect of Co addition and calcination temperature

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Green Energy & Environment 2023年第1期8卷 246-257页

作者： Hamidreza Nazeri Alireza Najafi Chermahini Zahra Mohammadbagheri Mirko Prato Department of Chemistry Isfahan University of Technology84154-83111IsfahanIran Materials Characterization facility Istituto Italiano di TecnologiaVia Morego 3016163GenovaItaly

A series of CoPd/KIT-6 bimetallic catalysts with various Co:Pd molar ratios at different calcination temperatures were prepared and used for the direct synthesis of H_(2)O_(2) from H_(2) and O_(2).These catalysts were characterized by nitrogen adsorption-desorption,low and wide-angle X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),scanning electron microscopy(SEM),elemental mapping and energy-dispersive X-ray(EDX)*** was found that the particle size,electronic interactions,morphology,and textural properties of these catalysts as well as their catalytic activity in the reaction of H_(2) with O_(2) were affected by Co addition and different calcination ***,the results showed that while the H_(2)O_(2) selectivity depends on Pd^(2+) species,the H_(2) conversion is related to Pd0 active *** these catalysts,CoPd/KIT-6 calcined at 350℃(CoPd/KIT-350 catalyst)showed the best catalytic activity with 50%of H_(2)O_(2) selectivity and 51%conversion of H_(2).

关键词： Direct synthesis of hydrogen peroxide Co/Pd catalysts Selectivity The oxidation state of Pd Reusability