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Solid ion transition route to 3D S-N-codoped hollow carbon nanosphere/graphene aerogel as a metal-free handheld nanocatalyst for organic reactions

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Nano Research 2017年第10期10卷 3486-3495页

作者： Jing Pan Shuyan Song Junqi Li Fan Wang Xin Ge Shuang Yao Xiao Wang Hongjie Zhang College of chemistry Jilin University Changchun 130012 China State key laboratory of rare earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China

A novel metal-free bulk nanocatalyst, S--N-codoped hollow carbon nanosphere/ graphene aerogel （SNC-GA-1000）, has been successfully fabricated using a facile and clean solid ion transition route. In this method, ZnS is used as the hard template and S source, while polydopamine acts as a reducing agent and carbon source. At a high annealing temperature, Zn metal is reduced and evaporates, leaving only free S vapor to diffuse into the carbon layer. Interestingly, the as-obtained SNC-GA-1000 exhibits much higher catalytic activity in an organic reduction reaction than unloaded bare S--N-codoped carbon nanospheres. Hydrothermal reduction of the graphene oxide sheets loaded with ZnSC@olydopamine core-shell nanospheres （ZnS@PDA） affords a three-dimensional bulk graphene aerogel. Although nanosized catalysts exhibit high catalytic activities, their subsequent separation is not always satisfactory, making post-treatment difficult. This approach achieves a trade-off between activity and separability. More importantly, due to the 3D structural nature, such bulk and handheld nanocatalysts can be easily separated and recycled.

关键词： bulk nanocatalyst solid ion transition graphene aerogel S-N-codoped metal-free

Extraction mechanism of rare earths from chloride acidic solution with ammonium-bifunctionalized ionic liquid extractants

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Science China chemistry 2016年第5期59卷 532-537页

作者： Hualing Yang Ji Chen Wei Wang Hongmin Cui Wengang Liu Yu Liu School of chemistry and Chemical Engineering Nantong University State key laboratory of rare earth Resources Utilization changchun institute of applied chemistry Chinese Academy of Sciences

A series of ammonium-bifunctionalized ionic liquid extractants （ammonium-Bif-ILEs） combined with a number of anions, in- cluding carboxylic acids and 1,3-diketonates, have been prepared and studied in this report. Their extraction behavior and properties toward rare earth ions （REs（III）） are systematically investigated in chloride media as a function of important param- eters such as aqueous phase pH, salting-out agent concentrations, and extraction temperature. The separation performance of ammonium-Bif-ILEs toward REs（III） are systematically discussed. The results demonstrate that ammonium-Bif-ILEs have a synergistic effect between the cation and anions in separation of REs（III）. The influences of different anions on separation fac- tor （β） values are further studied. By comparison, ammonium-Bif-ILEs containing 1,3-diketonates have more potential appli- cations in La（III）/RE（III） separation than those containing carboxylic acids.

关键词： ammonium-bifunctional ionic liquids separation rare earths

Interface associativity and energy absorption capability of anti-vibration porous Al-MM alloy core with iron alloy skin structures

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Journal of Iron and Steel Research International 2017年第7期24卷 730-736页

作者： Xu Ran Hong-wei Sun Li-dong Wang Yao-ming Wu School of Materials Science and Engineering Changchun University of Technology State key laboratory of rare earth Resource Utilization Changchun Institute of Applied ChemistryCAS

The interface associativity and energy absorption capability of composite structure with anti-vibration porous Al-MM（cerium-rich mischmetal）alloy core and iron alloy skin were *** aluminum core/iron alloy skin structures were fabricated considering an iron alloy tube as its shell and closed-cell porous Al-MM alloy as its core.A peeling experiment was carried out to calculate the capacity of interfacial bonding and a compression test was carried out to determine the energy absorption *** results showed that the addition of MM significantly enhanced both the interfacial bonding and the energy absorption capacity.

关键词： Porous Al-MM alloy xpanded perlite Interface associativity Energy absorption

Valence Change and Luminescence of Divalent Samarium in Strontium Borates

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Journal of Materials Science & Technology 1999年第5期15卷 449-452页

作者： Qinghua ZENG Zhiwu PEI Shubing WANG and Qiang SU(laboratory of rare earth chemistry and physics. changchun institute of applied chemistry, Chinese Academy of Sciences, changchun 130022, China) To whom correspondence should be addressedE-mail: zengqh@ns. laboratory of rare earth chemistry and physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China laboratory of Excited State Processes Chinese Academy of Sciences Changchun 130022 China

The valence change of samarium from trivalent to divalent state in strontium borates (SrB6O10)prepared in air was observed. The high resolution spectra of Sm2+ in matrix were studied between 10 K and 300 K. The results showed that three crystallographic sites for Sm2+ were available in the host. Energy transfer among these sites was possible. The vibronic transition of 5D0-7F0 of Sm2+ was studied at room temperature and the Huang-Rhys factor S was calculated. Due to the thermal population, 5D1 -7F0 transition at room temperature was observed

关键词： FJ cm nm

Suppressing the lattice oxygen diffusion via high-entropy oxide construction towards stabilized acidic water oxidation

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Nano Research 2024年第3期17卷 1107-1113页

作者： Jing Ni Zhaoping Shi Yibo Wang Jiahao Yang Hongxiang Wu Pengbo Wang Kai Li Meiling Xiao Changpeng Liu Wei Xing State key laboratory of Electroanalytic chemistry Jilin Province Key Laboratory of Low Carbon Chemistry PowerChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of applied chemistry and Engineering University of Science and Technology of ChinaHefei 230026China State key laboratory of rare earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

The scale-up deployment of ruthenium(Ru)-based oxygen evolution reaction(OER)electrocatalysts in proton exchange membrane water electrolysis(PEMWE)is greatly restricted by the poor *** the lattice-oxygen-mediated mechanism(LOM)has been identified as the major contributor to the fast performance degradation,impeding lattice oxygen diffusion to inhibit lattice oxygen participation is imperative,yet remains challenging due to the lack of efficient ***,we strategically regulate the bonding nature of Ru–O towards suppressed LOM via Ru-based high-entropy oxide(HEO)*** lattice disorder in HEOs is believed to increase migration energy barrier of lattice *** a result,the screened Ti_(23)Nb_(9)Hf_(13)W_(12)Ru_(43)O_(x) exhibits 11.7 times slower lattice oxygen diffusion rate,84%reduction in LOM ratio,and 29 times lifespan extension compared with the state-of-the-art RuO_(2) *** work opens up a feasible avenue to constructing stabilized Ru-based OER catalysts towards scalable application.

关键词： ruthenium-based high-entropy oxide suppressing the lattice oxygen diffusion acidic oxygen evolution reaction

Sinter-resistant and high-efficient Pt/CeO2/NiAl2O4/Al2O3@SiO2 model catalysts with “composite energy traps”

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Science China chemistry 2020年第4期63卷 519-525页

作者： Jingwei Li Kai Li Liwei Sun Zeshu Zhang Zhijian Wu Yibo Zhang Xiangguang Yang State key laboratory of rare earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China institute of Carbon Materials Science Shanxi Datong UniversityDatong 037009China Jilin Provincial key laboratory of Green chemistry and Process Changchun Institute of Applied ChemistryChangchun 130022China

The stability of nanosized catalysts at high temperature is still a challenging topic and is a crucial criterion to evaluate their suitability for industrial use. Currently, the strategy to improve the high-temperature stability of nano-sized catalysts is to restrict the migration of particles on the surface, which, however, lacks theoretical knowledge and directions. Herein, we reported a new approach that can effectively inhibit the migration and agglomeration of supported nanoparticles by fabrication of a model catalyst Pt/CeO2/NiAl2O4/Al2O3@SiO2. This catalyst is highly stable with the microstructure unchanged even after being aged at 1000 °C. Density functional theory calculations indicate that two types of confinement effects exist in the catalyst and their mechanisms were well explained from the viewpoint of "energy traps" which can also be applied to other supported catalysts.

关键词： stability of nanosized catalysts the migration and agglomeration of supported nanoparticles energy trap two types of confinement effects

Nanoscale Hybrid Langmuir-Blodgett Films Based on Cerium-Substituted Heteropolymolybdate and Polyquinoline

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Journal of rare earths 2003年第6期21卷 605-608页

作者：王峥柳士忠杜祖亮胡振纲张洪杰 key laboratory of rare earth chemistry and physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Faculty of Chemical & Material Science Hubei University key laboratory of Special Functional Materials Henan University

Nanoscale hybrid organic/inorganic Langmuir-Blodgett films of cerium-substituted heteropolymolybdates(Ce-HPMo) and π-conjugated macromolecule poly(1,2-dihydro-2,2,4-trimethyl)quinoline(PQ) were obtained with auxiliary film-forming material stearic acid(SA) or octadecylamine(ODA). The surface pressure-area isotherms illuminate the formation of the hybrid LB films of PQ/ODA/Ce-HPMo and PQ/SA/Ce-HPMo. The different film-forming mechanism was discussed when the different auxiliary film-forming materials were used in the system. The absorption spectra indicate that the molecules of PQ and Ce-HPMo are incorporated into the LB films. Tapping-mode AFM image reveals a granular surface texture of nanosized Ce-substituted heteropolymolybdate. STM image shows that the conductivity is greatly improved after Ce-substituted heteropolymolybdates are incorporated in the films.

关键词： electrics heteropolymolybdate polyquinoline langmuir-blodgett film conductivity rare earths

Recent progress report on DNA B-Z transition modulated by rare earth-amino acid complex and Alzheimer's disease amyloid beta

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Journal of rare earths 2010年第6期28卷 820-823页

作者：耿杰曲晓刚 State key laboratory of rare earth Resource Utilization Changchun Institute of Applied Chemistry Graduate School of the Chinese Academy of Sciences

rare earth elements have unique physical, magnetic, luminescent and catalytic properties. They have been successfully used as medicine and probes in luminescent resonance energy transfer (LRET) for bioassays, as well as reagents for diagnosis in magnetic resonance imaging (MRI). In this progress report, we will focus on recent progress on how rare earth amino complexes bind to DNA and change DNA structure, especially on DNA B-Z transition induced by rare earth amino acid complex and its potential impact on Alzheimer’s disease (AD).

关键词： DNA Z-DNA conformation amyloid beta Alzheimer's disease rare earths

Coating Nano-Hematite on (Y, Gd)BO_3∶Eu ^(3+) Phosphors by A Facile Method

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Journal of rare earths 2005年第S1期23卷 8-12页

作者：刘桂霞洪广言孙多先 key laboratory of rare earth chemistry and physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China College of Material and Chemical Engineering Changchun University of Science and Technology Changchun 130022 China key laboratory of rare earth chemistry and physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

(Y, Gd)BO_3∶Eu 3+ particles coated with nano-hematite were prepared by a facile method, for example (humid) solid phase reaction at room temperature. The resulted hematite-coated (Y,Gd)BO_3∶Eu 3+ particles were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) analysis, X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), and photoluminescence spectra (PL). The SEM and EDS analyses indicate that the particles are coated with a very thin layer of iron oxide. XPS results further confirmed that the coating was hematite, and the coating thickness was in nanometer range. XRD patterns showed that either the hematite coating was too thin or the content of hematite was too small, so that the XRD cannot detect it. The emission spectra illustrate that the peak near 580 nm disappears due to the coating of iron oxide, and when the coating is very thin, the ratio of 5D_0→7F_2 to 5D_0→7F_1 of coated particles is higher than that of uncoated ones, which indicates that the color purity of the phosphor is increased by coating nano-hematite.

关键词： solid phase reaction at room temperature coating hematite phosphors (Y,Gd)BO_3∶Eu 3+