检索结果-南通市图书馆

Journal of Rare Earths 2020年第10期38卷 1131-1139,I0005页

作者： Eduardo S.Rodrigues Gabriel S.Montanha Joao P.R.Marques Eduardo de Almeida Lauren N.M.Yabuki Amauri A.Menegario Hudson W.Pereira de Carvalho Laboratory of Nuclear Instrumentation(LIN) Center for Nuclear Energy in Agriculture(CENA)University of Sao Paulo(USP)PiracicabaSP13416-000Brazil Environmental Studies Center Sao Paulo State University(UNESP)Rio ClaroSP13506-900Brazil

This study aims at investigating the effects of foliar application of aqueous solutions of La3+and Ce3+nitrates on soybean plants(Glycine max).First,we observe that Triton HW 1000 surfactant at 0.01 vol%reduces droplets contact angle and increases their drying *** greenhouse conditions,the foliar treatments do not affect chlorophyll content,plant height,number of leaves,number of pods,number of seeds per pod,and average seed ***,the treatments induce phytotoxicity since foliar injuries appear after the *** x-ray fluorescence spectroscopy combined to scanning electron microscopy shows that the leaf lesions are positively correlated to accumulation of Ce and La on the leaf surface and also promote structural alteration to the epidermal cells.x-ray absorption near edge structure shows that the La and Ce nitrates are partially bio transformed into oxides by the leaves which might explain the harmful effects.

关键词： Leaf fertilization Rare earth elements Soybean x-ray fluorescence spectroscopy x-ray absorption spectroscopy

Electrocatalysis induced reconstruction of RuNiPO for highly efficient hydrogen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第12期87卷 24-31,I0003页

作者： Junhui Hu Bai xu Jiabin xu Shuo Li Zhonghu Liu Cheng Lu Yong Feng Kun Feng Jun Zhong Institute of Functional Nano and Soft Materials Laboratory(FUNSOM) Jiangsu Key Laboratory of Advanced Negative Carbon TechnologiesSoochow UniversitySuzhou 215123JiangsuChina Department of Chemistry University of Western OntarioLondonOntario N6A 5B7Canada

Reconstruction during the catalytic process has been considered to play a key role for the *** we report a RuNiPO based catalyst for efficient alkaline hydrogen evolution reaction(HER),which can benefit from a long-term reconstruction during HER for 10 h to continuously increase the *** final catalyst(e-RuNiPO)shows a huge morphology change from bulk sphere to highly exposed layered structure in the electrocatalysis process,and exhibits an interesting electronic structure modification with the electron transfer from Ru to Ni for better interfacial interaction and quick charge *** to the favorable morphology with more exposed active sites and the optimized electronic structure,the final catalyst can achieve an outstanding performance with only an overpotential of 15 mV at 10 mA cm^(-2)(with a good stability more than 100 h),even outperforming the performance of benchmark 20 wt%Pt/C catalyst(18 mV at 10 mA cm^(-2))by using a much lower Ru content.

关键词： Electrocatalyst Electrochemical reconstruction Hydrogen evolution reaction x-ray absorption spectroscopy

Mechanistic insights into sequestration of U(VI) toward magnetic biochar: Batch, xPS and ExAFS techniques

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2018年第8期30卷 217-225页

作者： Qingyuan Hu Yuling Zhu Baowei Hu Songhua Lu Guodong Sheng College of Life Science College of Chemistry and Chemical Engineering Shaoxing University Institute of Plasma Physics Chinese Academy of Science

The magnetic iron oxide（Fe3O4） nanoparticles stabilized on the biochar were synthesized by fast pyrolysis of Fe（II）-loaded hydrophyte biomass under N2 conditions. The batch experiments showed that magnetic biochar presented a large removal capacity（54.35 mg/g）at pH 3.0 and 293 K. The reductive co-precipitation of U（VI） to U（IV） by magnetic biochar was demonstrated according to x-ray diffraction, x-ray photoelectron spectroscopy and x-ray absorption near edge structure analysis. According to extended x-ray absorption fine structure analysis, the occurrence of U-Fe and U-U shells indicated that high effective removal of uranium was primarily inner-sphere coordination and then reductive co-precipitation at low pH. These observations provided the further understanding of uranium removal by magnetic materials in environmental remediation.

关键词： Magnetic biochar Uranium x-ray absorption spectroscopy Sequestration

Geometric and Electronic Structures of Pyrazine Molecule Chemisorbed on Si(100) Surface by xPS and NExAFS spectroscopy

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2020年第4期33卷 417-426,I0001页

作者： xiu-neng Song Huan-yu Ji Juan Lin Ruo-yu Wang Yong Ma Chuan-kui Wang School of Physics and Electronics Shandong Normal UniversityJi'nan 250014China

The geometric and electronic structures of several possible adsorption configurations of the pyrazine(C4H4N2)molecule covalently attached to Si(100)surface,which is of vital importance in fabricating functional nano-devices,have been investigated using x-ray *** Carbon K-shell(1s)x-ray photoelectron spectroscopy(xPS)and near-edge x-ray absorption fine structure(NExAFS)spectroscopy of predicted adsorbed structures have been simulated by density functional theory with cluster model *** xPS and NExAFS spectra demonstrate the structural dependence on different adsorption *** contrast to the xPS spectra,it is found that the NExAFS spectra exhibiting conspicuous dependence on the structures of all the studied pyrazine/Si(100)systems can be well utilized for structural *** addition,according to the classification of carbon atoms,the spectral components of carbon atoms in different chemical environments have been investigated in the NExAFS spectra as well.

关键词： Chemisorption/physisorption Adsorbates on surfaces x-ray absorption spectroscopy Photoemission and photoelectron spectra

Dual-shell silicate and alumina coating for long lasting and high capacity lithium ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第5期31卷 314-323页

作者： Marcos Lucero Tucker M.Holstun Yudong Yao Ryan Faase Maoyu Wang Alpha T.N’Diaye David P.Cann Joe Baio Junjing Deng Zhenxing Feng School of Chemical Biologicaland Environmental EngineeringOregon State UniversityCorvallisOR 97331United States Advanced Photon Source Argonne National LaboratoryArgonneIllinois 60439United States Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720United States Materials Science School of MechanicalIndustrialand Manufacturing EngineeringOregon State UniversityCorvallisOR 97331United States

Here we demonstrate a theory-driven, novel dual-shell coating system of Li_(2)SrSiO_(4) and Al_(2)O_(3), achieved via a facile and scalable sol-gel technique on LiCoO_(2) electrode particles. The optimal thickness of each coating can lead to increased specific capacity(~185 m Ah/g at 0.5 C-rate) at a cut-off potential of 4.5 V, and greater cycling stability at very high C rates(up to 10 C) in half-cells with lithium metal. The mechanism of this superior performance was investigated using a combination of x-ray and electron characterization methods. It shows that the results of this investigation can inform future studies to identify still better dual-shell coating schemes, achieved by such industrially feasible techniques, for application on similar, nickel-rich cathode materials.

关键词： Lithium cobalt oxide Surface coating Sol-gel Silicate Alumina x-ray absorption spectroscopy

Carbon decorated Li_(3)V_(2)(PO_(4))_(3) for high-rate lithium-ion batteries:Electrochemical performance and charge compensation mechanism

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第2期30卷 124-131,I0005页

作者： Manling Ding Chen Cheng Qiulong Wei Yue Hu Yingying Yan Kehua Dai Jing Mao Jinghua Guo Liang Zhang Liqiang Maig Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&1 DevicesSoochow UniversitySuzhou 215123JiangsuChina Department of Materials Science and Engineering Fujian Key Laboratory of Materials GenomeCollege of MaterialsXiamen UniversityXiamen 361005FujianChina College of Chemistry Tianjin Normal UniversityTianjin 300387China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCA 94720United States Department of Chemistry and Biochemistry University of CaliforniaSanta CruzCA 95064United States State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of Technology.Wuhan 430070HubeiChina

Fast charging and high-power delivering batteries are highly demanded in mobile electronics,electric vehicles and grid energy storage,but there are full of *** star-material Li_(3)V_(2)(PO_(4))_(3) is demonstrated as a promising high-rate cathode material meeting the above ***,we report the carbon decorated Li_(3)V_(2)(PO_(4))_(3) (LVP/C) cathode prepared via a facile method,which displays a remarkable high-rate capability and long-term cycling ***,the prepared LVP/C delivers a high discharge capacity of 122 mAh g^(-1)(-93% of the theoretical capacity) at a high rate up to 20 C and a superior capacity retention of 87.1% after 1000 ***,by applying a combination of x-ray absorption spectroscopy and full-range mapping of resonant inelastic x-ray scattering,we clearly elucidate the structural and chemical evolutions of LVP upon various potentials and cycle *** show unambiguous spectroscopic evidences that the evolution of the hybridization strength between V and O in LVP/C as a consequence of lithiation/delithiation is highly reversible both in the bulk and on the surface during the discharge-charge processes even over extended cycles,which should be responsible for the remarkable electrochemical performance of LVP/*** present study provides not only an effective synthesis strategy but also deeper insights into the surface and bulk electrochemical reaction mechanism of LVP,which should be beneficial for the further design of high-performance LVP electrode materials.

关键词： Lithium-ion batteries Li_(3)V_(2)(PO_(4))_(3) Charge compensation mechanism x-ray absorption spectroscopy Resonant inelastic x-ray scattering

Interface electronic engineering of molybdenum sulfide/Mxene hybrids for highly efficient biomimetic sensors

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第1期16卷 1158-1164页

作者： Pengfei Wu Tingting You Qingyuan Ren Hongyan xi Qingqing Liu Fengjuan Qin Hongfei Gu Yu Wang Wensheng Yan Yukun Gao Wenxing Chen Penggang Yin Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191China Energy&Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Shanghai Synchrotron Radiation Facility Zhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China

Interface regulation plays a key role in the electrochemical performance for *** controlling the interfacial interaction,the electronic structure of active species can be adjusted effectively at micro and nano-level,which results in the optimal reaction energy ***,we propose an interface electronic engineering scheme to design a strongly coupled 1T phase molybdenum sulfide(1T-MoS2)/Mxene hybrids for constructing an efficient electrocatalytic biomimetic *** local electronic and atomic structures of the 1T-MoS2/Ti3C2Tx are comprehensively studied by synchrotron radiation-based x-ray photoelectron spectroscopy(xPS),as well as x-ray absorption spectroscopy(xAS)at atomic *** and theoretical calculations show that there are interfacial stresses,atomic defects and adjustable bond-length between MoS2/Mxene nanosheets,which can significantly promote biomolecular adsorption and rapid electron transfer to achieve excellent electrochemical activity and reaction *** 1T-MoS2/Ti3C2Tx modified electrode shows ultra high sensitivity of 1.198μA/μM for dopamine detection with low limit of 0.05μ*** anticipate that the interface electronic engineering investigation could provide a basic idea for guiding the exploration of advanced biosensors with high sensitivity and low detection limit.

关键词： Mxene molybdenum sulfide interface electronic effect biomimetic sensor x-ray absorption spectroscopy

Revealing the working mechanism of a multi-functional block copolymer binder for lithium-sulfur batteries

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 Energy Chemistry 2021年第8期30卷 1-8,I0001页

作者： xin He Zhimeng Liu Guoping Gao xiaotao Liu Michal Swietoslawski Jun Feng Gao Liu Lin-Wang Wang Robert Kostecki Energy Storage&Distributed Resources Division Lawrence Berkeley National Laboratory1 Cyclotron Road94720 BerkeleyUSA Materials Sciences Division Lawrence Berkeley National Laboratory94720 BerkeleyUSA The Molecular Foundry Lawrence Berkeley National Laboratory94720 BerkeleyUSA Department of Materials Science&Engineering Southern University of Science and Technology(SUSTech)Shenzhen 518055China

The lithium-sulfur(Li-S)battery is one of the most promising substitutes for current energy storage systems because of its low cost,high theoretical capacity,and high energy ***,the high solubility of intermediate products(i.e.,lithium polysulfides)and the resultant shuttle effect lead to rapidly fading capacity and a low coulombic efficiency,which hinder the practical application of Li-S *** this study,block copolymers are constructed with both an ethylene oxide unit and a styrene unit and then used as binders for Li-S *** performance improvements are attributed to the synergistic effects contributed by the different units of the block *** ethylene oxide unit traps polysulfide,which bonds strongly with the intermediate lithium polysulfide,and enhances the transport of lithium ions to reach high ***,the styrene unit maintains cathode integrity by improving the mechanical properties and elasticity of the constructed block copolymer to accommodate the large volume *** enabling multiple functions via different units in the polymer chain,high sulfur utilization is achieved,polysulfide diffusion is confined,and the shuttle effect is suppressed during the cycle life of Li-S batteries,as revealed by operando ultraviolet-visible spectroscopy and S Kedge x-ray absorption spectroscopy.

关键词： Lithium sulfur batteries Polymer binder Block copolymer Ultraviolet-visible spectroscopy x-ray absorption spectroscopy

Evolution of Zn(Ⅱ) single atom catalyst sites during the pyrolysis-induced transformation of ZIF-8 to N-doped carbons

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2020年第20期65卷 1743-1751,M0004页

作者： Qing Wang Toshiaki Ina Wan-Ting Chen Lu Shang Fanfei Sun Shanghai Wei Dongxiao Sun-Waterhouse Shane G.Telfer Tierui Zhang Geoffrey I.N.Waterhouse School of Chemical Sciences The University of Auckland.Auckland 1142New Zealand Research&Utilization Division Japan Synchrotron Radiation Research InstituteKouto 679-5148Japan Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of Sciences.Beijing 100190China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics.Chinese Academy of SciencesShanghai 201204China Department of Chemical and Materials Engineering Faculty of EngineeringThe University of AucklandAuckland 1142New Zealand MacDiarmid Institute for Advanced Materials and Nanotechnology Massey UniversityPalmerston North 4442New Zealand

The pyrolysis of zeolitic imidazolate frameworks(ZIFs) is becoming a popular approach for the synthesis of catalysts comprising porphyrin-like metal single atom catalysts(SACs) on N-doped carbons(M-N-C).Understanding the structural evolution of M-N-C as a function of ZIF pyrolysis temperature is important for realizing high performance ***,we report a detailed investigation of the evolution of Zn single atom catalyst sites during the pyrolysis of ZIF-8 at temperatures ranging from 500 to 900℃.Results from Zn L-edge and Zn K-edge x-ray absorption spectroscopy studies reveal that tetrahedral ZnN4 centers in ZIF-8 transform to porphyrin-like ZnN4 centers supported on N-doped carbon at temperatures as low as 600℃.As the pyrolysis temperature increased in the range 600-900℃,the Zn atoms moved closer to the N4 coordination *** subtle geometry change in the ZnN4 sites alters the electron density on the Zn atoms(formally Zn2+),strongly impacting the catalytic performance for the peroxidase-like decomposition of H2 *** catalyst obtained at 800℃(Zn-N-C-800) offered the best performance for H2 O2 *** work provides valuable new insights about the evolution of porphyrin-like single metal sites on N-doped carbons from ZIF precursors and the factors influencing SAC activity.

关键词： Metal single atom catalysts Porphyrin-like sites N-doped carbon Metal organic frameworks x-ray absorption spectroscopy

Decoupling the adsorption mechanisms of arsenate at molecular level on modified cube-shaped sponge loaded superparamagnetic iron oxide nanoparticles

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第11期34卷 1-12页

作者： xiang-Yang Lou Roberto Boada Veronica Verdugo Laura Simonelli Gustavo Pérez Manuel Valiente GTS-UAB Research Group Department of ChemistryFacultat de CiènciesUniversitat Autonoma de Barcelona08193 BellaterraSpain ALBA Synchrotron Carrer de la llum 2-26Cerdanyola del Valles08290 BarcelonaSpain Centro de Excelencia en Nanotecnologia Leitat ChileSantiago 7500724Chile

In this study, a commercial cube-shaped open-celled cellulose sponge adsorbent was modified by in-situ co-precipitation of superparamagnetic iron oxide nanoparticles(SPION) and used to remove As(V) from aqueous solutions. Fe K-edge x-ray absorption spectroscopy(xAS) and TEM identified maghemite as the main iron phase of the SPION nanoparticles with an average size 13 nm. Batch adsorption experiments at 800 mg/L showed a 63% increase of adsorption capacity when loading 2.6 wt.% mass fraction of SPION in the *** determination of the adsorption thermodynamic parameters indicated that the As(V) adsorption on the composite material is a spontaneous and exothermic *** K-edge xAS results confirmed that the adsorption enhancement on the composite can be attributed to the nanoparticles loaded. In addition, adsorbed As(V) did not get reduced to more toxic As(Ⅲ) and formed a binuclear corner-sharing complex with SPION. The advantageous cube-shape of the sponge-loaded SPION composite together with its high affinity and good adsorption capacity for As(V), good regeneration capability and the enhanceddiffusion attributed to its open-celled structure make this adsorbent a good candidate for industrial applications.

关键词： Adsorption Cube composite adsorbent Arsenate removal Regeneration x-ray absorption spectroscopy