检索结果-南通市图书馆

Deciphering Water Oxidation Catalysts:The Dominant Role of Surface Chemistry over Reconstruction Degree in Activity Promotion

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第3期17卷 340-354页

作者： Li An Jianyi Li Yuanmiao Sun Jiamin Zhu Justin Zhu Yeow Seow Hong Zhang Nan Zhang Pinxian Xi * Zhichuan JXu Chun‑Hua Yan state key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu ProvinceFrontiers Science Center for Rare IsotopesCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000People’s Republic of China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Faculty of Materials Science and Energy Engineering Institute of Technology for Carbon NeutralityShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China key Laboratory of Electromagnetic Materials and Devices National Center for International Research On Photoelectric and Energy MaterialsSchool of Materials and EnergyElectron Microscopy CenterYunnan UniversityKunming 650091People’s Republic of China state key Laboratory of baiyunobo rare earth resource Researches and comprehensive utilization Baotou Research Institute of Rare EarthsBaotou 014030People’s Republic of China Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsPKU‑HKU Joint Laboratory in Rare Earth Materials and Bioinorganic ChemistryPeking UniversityBeijing 100871People’s Republic of China

Water splitting hinges crucially on the availability of electrocatalysts for the oxygen evolution *** surface reconstruction has been widely observed in perovskite catalysts,and the reconstruction degree has been often correlated with the activity ***,a systematic study on the roles of Fe substitution in activation of perovskite LaNiO_(3)is *** substituting Fe content influences both current change tendency and surface reconstruction ***_(0.9)Fe_(0.1)O_(3)is found exhibiting a volcano-peak intrinsic activity in both pristine and reconstructed among all substituted perovskites in the LaNi_(1-x)Fe_(x)O_(3)(x=0.00,0.10,0.25,0.50,0.75,1.00)*** reconstructed LaNi_(0.9)Fe_(0.1)O_(3)shows a higher intrinsic activity than most reported NiFe-based ***,density functional theory calculations reveal that Fe substitution can lower the O 2p level,which thus stabilize lattice oxygen in LaNi0.9Fe0.1O3 and ensure its long-term ***,it is vital interesting that activity of the reconstructed catalysts relied more on the surface chemistry rather than the reconstruction *** effect of Fe on the degree of surface reconstruction of the perovskite is decoupled from that on its activity enhancement after surface *** finding showcases the importance to customize the surface chemistry of reconstructed catalysts for water oxidation.

关键词： Oxygen evolution reaction Perovskite oxides Doping Activation and reconstruction

Continuous preparation of composition-controllable Y-Ni alloy in LiF-YF_(3)-Y_(2)O_(3)molten salt

在线全文

学校读者我要写书评

暂无评论

Journal of rare earths 2023年第4期41卷 632-638页

作者： Bing Yu Qicao Yan state key laboratoryof baiyunobo rare earth resource researchesand comprehensive utilization Baotou Research Insttuteof RareEarthsBaotou 014030China Ganjiang Innovation Academy.Chinese Academy of Sciences Ganzhou 341000China

The Y-Ni alloy is a primary precursor for the preparation of high-performance La-Y-Ni-based hydrogen storage ***,it cannot be produced continuously at low cost,which limits the wide popularization and application of La-Y-Ni-based *** this paper,this problem was solved perfectly using electrochemical reduction of Y_(2)O_(3)in the LiF-YF_(3)*** is found that the reversible reduction from Y^(3+)to Y on the W electrode takes only one step,namely a significant soluble-soluble reaction controlled by Y^(3+)diffusion throughout the *** typical signals of square wave voltammetry(SWV)corresponding to different kinds of Y-Ni intermetallic compounds are observed in LiF-YF_(3)and LiF-YF_(3)-Y_(2)O_(3)melts,and reduction potential can become positive with the addition of Y_(2)O_(3),probably because of the formation of more complexes in the *** Y-Ni alloy samples were produced continuously and prepared via galvanostatic electrolysis by using bargain-price raw material(Y_(2)O_(3))and setting the current density at 10 A/cm^(2)on the nickel electrode,before they were collected into a bottom receiver.A series of analyses including scanning electron microscopy-energy idspersive X-ray spectroscopy(SEM-EDS),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and inductively coupled plasma mass spectrometry(ICP-MS),demonstrate that concentration of yttrium in Y-Ni alloy is adjustable within the wide range of 44 wt%to 72 wt%by fine-tuning the electrolysis temperature(875-1060℃)in the LiF-YF_(3)system to ensure the optimal hydrogen storage performance and economic efficiency of La-Y-Ni-based hydrogen-storage materials.

关键词： Y^(3+) LiF-YF_(3)-Y_(2)O_(3) Electroreduction Chronopotentiometry Y-Ni alloy rare earths

Amino acid assisted aqueous synthesis of highly stable CsPbBr_(3)nanocrystals for cell imaging

在线全文

学校读者我要写书评

暂无评论

Nano Research 2025年第1期18卷 675-683页

作者： Xue Li Yanan Guo Guoying Tan Qingyi Liu Nan Song Yu Tang state key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China state key Laboratory of baiyunobo rare earth resource Researches and comprehensive utilization Baotou Research Institute of Rare EarthsBaotou 014030China

Lead halide perovskite nanocrystals(NCs)exhibit excellent optoelectronic performance and have drawn great interests in the fields of biological imaging and ***,the poor stability of CsPbX_(3)(X=Cl,Br,I)in water is still a challenge to hinder their practical *** this work,a facile strategy has been developed for aqueous synthesis of CsPbX_(3) nanocrystals,in which L-glutamic acid(LGlu)has been used to replace oleic acid in the synthetic *** from the synergic effects of L-Glu and oleylamine(OAm),CsPbBr_(3)nanocrystals(L-Glu/OAm-CsPbBr_(3)NCs)with high water stability have been directly prepared under a mild condition at room temperature in water,facilitated by the process of crystal phase transformation from Cs_(4)PbBr_(6) to CsPbBr_(3).L-Glu/OAm-CsPbBr_(3)NCs exhibit a high quantum yield of 85%and a narrow full width at half maximum of 16 nm,demonstrating their efficient luminescence in ***,L-Glu on the surface have contributed greatly to an acidic environment and passivation of surface defects,improving the water stability and dispersibility of CsPbBr_(3)***,L-Glu/OAm-CsPbBr_(3)NCs exhibit great biocompatibility due to the presence of L-Glu,resulting in their good performance for HeLa cell ***,we propose a facile and effective method to prepare CsPbBr_(3)nanocrystals with excellent water stability by using L-Glu and OAm as cooperated ligands and expand their application in cell imaging.

关键词： aqueous synthesis cell imaging lead halide perovskite nanocrystals L-glutamic acid phase transformation

Niobium and phosphorus behavior during melting-separation process of pre-reduced niobium ore concentrate

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2017年第7期24卷 691-696页

作者： Yu-bao Liu Zhi-hong Zhang Er-xiong Zhao Xian-heng Zhang Xiao-qing Wang Guo-hua Chen Inner Mongolia Niobium Metallurgical Engineering Laboratory Baotou Research Institute of Rare Earths state key Laboratory of baiyunobo rare earth resource Researches and comprehensive utilization

The pre-reduced Bayan Obo ferroniobium（FeNb）ore concentrate block was taken as raw materials for studying the physical properties of niobium-enriched slag and changes in niobium recovery *** addition,the dephosphorization rate of the slag under different melting-separation conditions was investigated using the melting-separation *** research results demonstrate that（i）the niobium recovery rate and dephosphorization rate of the slag decrease with the increase in melting-separation temperature;（ii）the niobium recovery rate of the slag initially increases and then decreases with increase in basicity and time;and（iii）the dephosphorization rate of the slag increases with the increase in basicity and *** the test was performed under the conditions of basicity of 0.6-0.7,time of 7-10min,and temperature of 1400-1450°C,the niobium recovery rate and dephosphorization rate are over 96%and 95%,*** scanning electron microscopy,it is observed that niobium mainly exists in the form of calcium and titanium silicate within the slag phase,with uneven distribution.

关键词： Melting separation Pre-reduced niobium ore concentrate Niobium-enriched slag Iron Dephosphorization rate Niobium recovery rate

Thermodynamic and application study of complicated extraction system Ce(Ⅳ)-HF-H_(3)BO_(3)-H_(2)SO_(4) using Cyanex 923

在线全文

学校读者我要写书评

暂无评论

Journal of rare earths 2021年第9期39卷 1117-1125页

作者： Dan Zou Haitian Li Ji Chen Deqian Li state key Laboratory of baiyunobo rare earth resource Researches and comprehensive utilization Baotou 014030China state key Laboratory of rare earth resources utilization Changchun Institute of Applied Chemiscry Chinese Academy of SciencesChangchun 130022.China

This article aims to reduce the environmental pollution while maximizing the recovery of REEs as well as associate resource-fluorine(F)from *** paper investigates the extraction equilibrium process and mechanism of Ce(Ⅳ)-HF-H_(3)BO_(3)-H_(2)SO_(4)system using Cyanex *** equilibrium process of different systems,including HF-H_(2)SO_(4),H_(3)BO_(3)-HF-H_(2)SO_(4),and Ce(Ⅳ)-HF-H_(2)SO_(4),were studied in detail and the corresponding extraction mechanisms were also *** is noteworthy that a synergistic effect between B-F and an antagonistic effect between Ce(Ⅳ)-F were discovered first in the extraction process by Cyanex ***,H_(3)BO_(3)is found to be able to promote the extraction of F in quantitation by Cyanex *** and^(11)B and^(19)F NMR were adopted to characterize the different loaded organic *** on these results,the extraction mechanism of complicated system Ce(Ⅳ)-HF-H_(3)BO_(3)-H_(2)SO_(4)was further ***,the effect of H_(3)BO_(3)on the extraction and stripping of Ce(Ⅳ)in complicated system was ***,it shows that the addition of H_(3)BO_(3)has nothing to do with the purity of obtained CeF_(3)particle from bastneasite liquor in the practical *** H_(3)BO_(3)into bastnaesite leach liquor,on the one hand,will be beneficial for the recovery yield of Ce and *** the other hand,it can avoid from environmental pollution caused by emission of F-containing waste water as well as reducing the waste residue.

关键词： Ce(Ⅳ)-HF-H_(3)BO_(3)-H_(2)SO_(4) Extraction Cyanex 923 Thermodynamic Mechanism rare earths

Effect of Ce on microstructure and mechanical properties of Mg-Zn-Ce magnesium alloys

在线全文

学校读者我要写书评

暂无评论

China Foundry 2023年第4期20卷 271-279页

作者： Hong-fei Wu Wen-xin Hu Shao-bo Ma Zheng-hua Yang Wei Wang Feng Liu Wei He state key Laboratory of baiyunobo rare earth resource Researches and comprehensive utilization Baotou 014030Inner MongoliaChina Baotou Research Institute of rare earths Baotou 014030Inner MongoliaChina

The Mg-6Zn alloy with different contents of Ce was prepared by the gravity casting method,and then the Mg-6Zn-xCe(x=0,0.5,1.0,1.5,wt.%)alloys were extruded at 300℃and 350℃ after solution *** phase constitution and microstructure evolution of Mg-Zn-xCe alloys were analyzed by X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and electron backscattering diffraction(EBSD).Meanwhile,the mechanical properties of the alloy were tested at room *** as-cast alloys,the results show that the main compound in Mg-6Zn alloy is Mg4Zn7 phase,and the main compound is T-(MgZn)12Ce phase after the addition of different amounts of *** microstructure and distribution of second phases are greatly improved after extrusion at 300℃and 350℃.Compared with initial mechanical properties,the strength and elongation increase obviously by means of extrusion at different *** addition,the microstructure after extrusion at 350℃is further analyzed according to EBSD *** results show that rare earth element Ce probably promotes the activation of non-basal slip during the deformation process with the increase of Ce,which reduces the strength of basal texture and thus improves the plasticity of the ***,the increase of grain boundary migration ability leads to the gradual increase of recrystallization grain size and decreases the strength.

关键词： Mg-Zn-Ce extrusion microstructure mechanical properties magnesium alloys

Self-assembly-induced luminescence of Eu3+-complexes and application in bioimaging

在线全文

学校读者我要写书评

暂无评论

National Science Review 2022年第1期9卷 107-117页

作者： Ping-Ru Su Tao Wang Pan-Pan Zhou Xiao-Xi Yang Xiao-Xia Feng Mei-Na Zhang Li-Juan Liang Yu Tang Chun-Hua Yan state key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province College of Chemistry and Chemical Engineering Lanzhou University state key Laboratory of baiyunobo rare earth resource Researches and comprehensive utilization Baotou Research Institute of Rare Earths

Design and engineering of highly efficient emitting materials with assembly-induced luminescence,such as room-temperature phosphorescence（RTP） and aggregation-induced emission（AIE）,have stimulated extensive ***,we propose a new strategy to obtain size-controlled Eu;3+;-complex nanoparticles（Eu-NPs） with self-assembly-induced luminescence（SAIL） characteristics without encapsulation or *** with previous RTP or AIE materials,the SAIL phenomena of increased luminescence intensity and lifetime in aqueous solution for the proposed Eu-NPs are due to the combined effe ct of self-assembly in confining the molecular motion and shielding the water *** proof of concept,we also show that this system can be further applied in bioimaging,temperature measurement and HClO *** SAIL activity of the rare-earth（RE） system proposed here offers a further step forward on the roadmap for the development of RE light conversion systems and their integration in bioimaging and therapy applications.

关键词： rare earth complexes self-assembly-induced luminescence bioimaging temperature and HClO sensing

Room temperature ferromagnetic property of Fe-Y(Fe:Y-6.5) composite oxide nano-cluster via an extremely easy and scalable method

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of rare earths 2021年第6期39卷 696-702,I0004页

作者： Yi Sui Xiaoyu Liu Changsheng Liu School of Materials Science and Engineering Northeastern UniversityShenyang 110004China state key Laboratory of baiyunobo rare earth resource Researches and comprehensive utilization Baotou Research Institute of Rare EarthsBaotou 014030China

A novel Fe-Y composite oxide(Fe:Y-6.5) nanocluster was synthesized by self-assembly *** α-Fe_(2)O_(3) and cubic-Y_(2)O_(3) nanocrystalline with diameter around 10 nm are homogeneously assembled to form a cluster architecture which are constituted of Fe6.5Y composite oxide *** oxygen vacancies are introduced with cubic-Y_(2)O_(3),and the oxygen vacancies as Fe^(3+)-V_(0)-Y^(3+) between α-Fe_(2)O_(3) and cubic-Y_(2)O_(3) nanocrystalline are generated by self-assembly *** hysteresis loops recorded by vibrating sample magnetometry at 273 K display a ferromagnetic order,related to the fact that Fe^(3+)-V_(o)-Y^(3+) act as defect centers in the bound magnetic polaron model for Fe-Y composite oxide *** ferromagnetic prope rties are proportional to oxygen vacancy co ntents,and maximum magnetization(M_(m)) value of the nano-cluster reaches 5.14 A·m^(2)/g.

关键词： Room temperature ferromagnetism Fe-Y oxide nano-cluster Self-assembly Oxygen vacancy rare earths

Low remanence temperature coefficient Sm1-xErx(Co,Fe,Cu,Zr)z magnets operating up to 400℃

在线全文

学校读者我要写书评

暂无评论

rare Metals 2020年第1期39卷 70-75页

作者： Tian-Li Zhang Bo Zhang Hui Wang Cheng-Bao Jiang Zhi-Hong Zhang Xiao-Qing Wang Wei Zhang School of Materials Science and Engineering Beihang UniversityBeijing100191China state key Laboratory of baiyunobo rare earth resource Researches and comprehensive utilization Baotou Research Institute of Rare EarthsBaotou014030China

Er-doped Sm1-xErx(CobalFe0.15Cu0.08Zr0.03)7.8(x=0,0.1,0.2,0.3)magnets with a low remanence temperature coefficient were prepared by powder metallurgy *** influence of Er content on the remanence and microstructure was investigated.X-ray diffractometer(XRD)analysis showed that the magnets with different Er contents consist of 2:17 R phase and 1:5 H *** electron microscopy(SEM)analysis showed that the composition of the matrix is consistent with stoichiometric composition and no obvious precipitated phase *** the increase in doped Er amount,the temperature stability of Sm1-xErx(CobalFe0.15Cu0.08Zr0.03)7.8(x=0,0.1,0.2,0.3)is getting *** x is up to 0.3,the magnets with a low remanence temperature coefficient are obtained and the remanence descends tardily from 0.86 to 0.80 T as the temperature rises from room temperature to 400℃.These results indicate that Er substitution for Sm in SmCobased permanent magnets together with optimal composition and proper heat treatment could achieve a desired magnetic performance combined with high thermal stability.

关键词： Permanent magnets Low remanence temperature coefficient Er doped Magnetic performance characterization