近期热点文章北大核心CSCD

关键词：Na＋活性·化学电源Operando研究方法Q. Li, Z. Liu, F. Zheng, R. Liu, J. Lee, G. Xu, G.Zhong, X. Hou, R. Fu, Z. Chen, K. Amine, J. Mi, S.Wu, C. P. Grey, Y. Yang. Identifying the Structural Evolution of the Na-Ion Battery Na2Fe PO4F Cathode,Angew. Chem. Int. Ed., 10.1002/anie.201805555.厦门大学杨勇教授和合作者采用原位高能XRD、固态NMR和DFT理论方法,研究了Na2FePO4F阴极材料循环过程中晶体结构的动态变化,发现存在两种Na＋晶格位点,但只有一种有电化学活性.化学电源中的Operando研究方法为揭示电极活性物质的构效关系和反应机理提供了有力工具.     

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正Metal-Free Dihydrogen Oxidation by a Borenium Cation:A Combined Electrochemical/Frustrated Lewis Pair Approach E.J.Lawrence,T.J.Herrington,A.E.Ashley,G.G.Wildgoose Angew.Chem.Int.Ed.DOI:10.1002/anie.201405721以一种含硼杂环分子为电子传递媒介,催化有机介质中的氢氧化反应(HOR).Exfoliation of Layered Double Hydroxides for Enhanced Oxygen Evolution Catalysis F.Song,X.Hu Nature Commun.DOI:10.1038/ncomms5477     

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正Size-Dependent Surface Phase Change of Lithium Iron Phosphate during Carbon Coating J.Wang,J.Yang,Y.Tang,J.Liu,Y.Zhang,G.Liang,M.Gauthier,Y.K.Chen-Wiegart,M.N.Banis,X.Li,R.Li,J.Wang,T.K.Sham,X.Sun Nature Commun.DOI:10.1038/ncomms4451发现LiFePO4包碳过程的界面相变与活性物质的粒径有关,纳米粒子的界面稳定性较高,而微米粒子在高温包碳过程中界面发生明显变化.     

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<正>Graphene,Related Two-Dimensional Crystals,and Hybrid Systems for Energy Conversion and Storage F.Bonaccorso,L.Colombo,G.Yu,M.Stoller,V.Tozzini,A.C.Ferrari,R.S.Ruoff,V.Pellegrini Science DOI:10.1126/science.1246501关于石墨烯用于能量转化与储存的综述.引用了138篇参考文献.     

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<正>Size-Dependent Electrocatalytic Reduction of CO2 over Pd Nanoparticles D.Gao,H.Zhou,J.Wang,S.Miao,F.Yang,G.Wang,J.Wang,X.Bao J.Am.Chem.Soc.DOI:10.1021/jacs.5b00046CO2还原反应Pd纳米催化剂的粒度效应.发现3.7nm时CO产率可达91.2%.     

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TiO2 Microboxes with Controlled Internal Porosity for High-Performance Lithium Storage X. Gao, G. Li, Y. Xu, Z. Hong, C. Liang, Z. Lin Angew. Chem. Int. Ed. DOI: 10.1002/anie.201506357 合成由TiO2纳米棒构成的纳米多孔结构,用作锂离子电池阳极材料,循环300周仍具有187 mAh?g-1的容量,且可20C高倍率放电. Highly Efficient Electrochemical Reduction of CO2 to CH4 in Ionic Liquid Using Metal-Organic Framework Cathode X. Kang, Q. Zhu, X. Sun, J. Hu, J. Zhang, Z. Liu, B. Han Chem. Sci. DOI: 10.1039/C5SC03291A 在碳纸表面沉积含Zn的金属有机框架（MOF）化合物,该电极可高效催化CO2电还原为CH4.     

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正A New Rechargeable Sodium Battery Utilizing Reversible Topotactic Oxygen Extraction/Insertion of CaFeOz(2.5≤z≤3)in An Organic Electrolyte M.Hibino,R.Harimoto,Y.Ogasawara,R.Kido,A.Sugahara,T.Kudo,E.Tochigi,N.Shibata,Y.Ikuhara,N.Mizuno J.Am.Chem.Soc.DOI:10.1021/ja411365z以CaFeO3为正极材料,充电时CaFeO3还原为CaFeO2.5,释放出来的O与Li+或Na+生成氧化物.     

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<正>Electrochemical Water-Splitting Based on Hypochlorite Oxidation K.M.Macounov觃,N.Simic,E.Ahlberg,P.Krtil J.Am.Chem.Soc.DOI:10.1021/jacs.5b02087碱性介质中ClO-在Pt电极表面氧化生成ClO·自由基,继而氧化H2O,产生O2和H2O2.间接实现水分解.     

Two New Sterols from Amoora yunnanensis

ThegenusAmooracomprisingabout25-3ospeciesisdistributedinIndiaandtheMalayPeninsula.SixspeciesaredistributedinYunnanprovince.Amoorayunnanensis(H.L.Li)C.YWu,ismainlydistributedintheSouthofYunnanl.AccordingtoPenningtonandStyles',Amooracannotbeconsideredasavalidgenus.UptonoWchemicalconstituentsforthisgenushavenotbeenreportedyet.lnourchemicalstudyonAmoorayunnanensis,tetTanortfiterPenoidsorprotolimonoidsthatwereconsideredaschemotaxonomicmarkersofthefamilyMeliaceae,werenotisolated.lnthispaper…     

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正Suppression of Lithium Dendrite Growth Using Cross-Linked Polyethylene/Poly(ethylene oxide)Electrolytes:A New Approach for Practical Lithium-Metal Polymer Batteries R.Khurana,J.L.Schaefer,L.A.Archer,G.W.Coates J.Am.Chem.Soc.DOI:10.1021/ja502133j将聚乙烯和聚氧乙烯的交联共聚物用作金属锂电池隔膜,不仅获得较高的离子电导率,还可抑制锂枝晶的生长.     

Evaluation of Drug Interaction in Binding to Protein by High Performance Liquid Chromatography

Drugsinthebodyareboundtometabolizingenzymes,targets/receptorsandtransportproteinsincertainextent .Thebindingofdrugstotargetsorreceptorsismainlyspecificandresponsibleforitspharmacologicalandtherapeuticeffects .Theme tabolizingofdrugsbyenzymeinvolvesbothspecificandnon specificbinding .Drugsinteracttoadiffer entdegreewithproteinsinbloodnon specifically ,whichaffectsthedistribution ,metabolism ,elimi nation ,andpharmacologicalaction .Thesebindingpropertiesarecharacteristicforaparticulardrug .Ther…     

X-Ray Diffraction and NMR Study of Inclusion Complex of Podophyllotoxin with β-Cyclodextrin

Podophyllotoxin(Figurel)isalignan,naturallyoccurringinrootsandrhizomesofPodophyllumemodiWall.var.ChineseSprague'.Thiscompoundisclinicallyusedtotreatseveraltypesofcancer2.However,asadrug,itisrestraintedduetoitshightoxicityandsideeffecttohumanbody.Wehavepreparedtheinclusioncomplexofpodophyllotoxinwith0-cyclodextrin(Figure2)inordertodecreasetoxicityandincreasesolubilityofpodophyllotoxin.ThestrUctureoftheinclusioncomplexofthepodophyllotoxinwith0-cyclodextrinhavebeenstudiedbythemethodsofX-raydi…     

高效液相色谱法测定蔬菜和粮食中的烯虫酯

建立了一种测定烯虫酯的反相高效液相色谱紫外法.样品中的烯虫酯用石油醚提取,C18ODS柱净化,以82. 5%甲醇为流动相洗脱,Phenomenex CIB(150 mm×4. 6 mmi. d,5μm)柱分离,用紫外检测器(λem=260nm)测定.研究表明,烯虫酯含量在0. 10～50. 0μg/mL范围内,峰面积与待测物的质量浓度呈良好的线性关系,相关系数为0. 998,测量结果的相对标准偏差小于4. 36%(n=5),回收率为83. 5%～102. 2%.     

木素碱性硝基苯氧化产物的高效液相色谱分析

- hydroxybenzaldehyde,vanillin and syringaldehyde etc. were separated on a Novapak C18 column (5μ 3. 9mm i. d.× 150mm) and eluted with MeOH-H2O (25:75, V/V) at a flow rate of 0. 6mL/min and detected at 254nm. Quantitative analysis was performed with piperonal instead of synthetic product . m-meconin,as the internal standard. Recoveries are 95%-98% and CV≤1%. The method is simple,rapid and reliable.     

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A Bio-Inspired,Small Molecule Electron-CoupledProton Buffer for Decoupling the Half-Reactions of Electrolytic Water Splitting B.Rausch,M.D.Symes,L.Cronin J.Am.Chem.Soc.DOI:10.1021/ja4071893又一篇时空分离水电解的报道.阳极直接析氧,但阴极不是直接析氢,而是以醌/酚电对为电子转移媒介.Seed-Mediated Synthesis of Core/Shell FePtM/FePt(M=Pd,Au)Nanowires and Their Electrocatalysis for Oxygen Reduction Reaction     

Rapid determination of atrazine in environmental water samples by a novel liquid phase microextraction

A novel method was described for the rapid determination of atrazine using dispersive liquid phase microextraction in combination with high performance liquid chromatography （HPLC）. Possible impact parameters such as sample pH, extraction and disperser solvents, salting-out effect, and extraction time were investigated. The experimental results indicated that proposed method possessed an excellent analytical performance, The linear range, detection limit, and precision （R.S.D.） were 0.1- 50 ng mL- 1 （R2 = 0.9955）, 0.601 ng mL- 1 and 6,4%, respectively. The proposed method was validated with the real water samples, and the spiked recoveries were in the range of 69.9-89.8%, respectively. These results indicated that the established method with high enrichment factor, short extraction time was an excellent alternative for the routine analysis of atrazine in environmental samples. 2007 Qing Xiang Zhou. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.     

STRUCTURE OF（C6H5COCHCOC6H5）SmI2（THF）3

<正> (C6H5COCHCOC6H5)SmI2(THF)3,Mr= 843. 75,triclinic space group P1,a=13. 274(3),b=9. 886(3),c= 12. 526(4)A,a= 110. 89(3),B=93. 98(2),y=85. 16(2) ,V=1528. 9(8)A3,Z=2,Dc=1. 83g/cm3, (MoKa) = 0. 71069A,u= 40. 3cm-1,F(000) - 810. The structure was solved by Patterson and Fourier techniques and refined by least-squares method to a final conventional R value of 0.082(Rw= 0. 083). The central Sm(III) ion is coordinated by two iodine ions, two oxygen atoms from C6H5COCHCOC6H5 and three oxygen atoms from three THF molecules to form a distorted pentagonal bipyramid. The Sm-I distances are 3. 103 and 3. 092 A ,The Sm-O (O atom from C6H5COCHCOC6H5) distances are 2. 273 and 2. 307 A and the average Sm -O(THF) distance is 2. 500A.     

CTMAB对反相高效液相色谱-电化学检测法测定水中痕量酚类化合物的增敏、增稳作用

研究了阳离子表面活性剂CTMAB对高效液相色谱 -电化学检测法测定水中痕量酚类化合物的增敏、增稳作用。流动相中CTMAB的最佳浓度为 0 .80mmol/L。使用NucleosilC8色谱柱 (2 0 0mm× 4 .6mmi.d .) ,流动相为甲醇 - 0 .0 2 5mol/L邻苯二甲酸氢钾缓冲液 (体积比为 6 0∶4 0 ,pH =5 .0 ,含 0 .0 6mmol/LEDTA、0 .80mmol/LCTMAB)。该方法测定苯酚、4 氯苯酚、2 ,4 二氯苯酚、2 ,4 ,5 三氯苯酚的线性范围分别为 0 .10～ 15 .0 0、0 .15～ 12 .5 0、0 .15～ 2 2 .5 0、0 .30～ 5 0 .0 0 μg/mL ,检出限分别为 0 .0 0 8、0 .0 10、0 .0 16、0 .0 34μg/mL ,测定结果的相对标准偏差分别为 7.0 %、7.2 %、6 .0 %、7.0 % ,回收率分别为 4 8.0 %、80 .0 %、76 .0 %、85 .0 %。     

SYNTHESIS AND CRYSTAL STRUCTURE OF [C8H8NdCl（THF）2]2

<正> The title complex was prepared from the reaction of NdClLi0.3 and C8H8, its crystal structure was determined by single-crystal X-ray diffraction. It crystallizes in the monoclinic space group P21/c with cell dimensions o = 11. 819(3), 6=12.651(3), c=13. 478(3)A, β=122.99(2)°, Mr = 856. 00, Z = 2, Dc=1. 68g/cm3, F(000) = 636. 89, V = 1690. 33A3. The structure was solved by direct methods and Fourier techniques. Least squares refinement on the basis of 1842 observed reflections led to final R = 0. 038 and Rw = 0. 040. The molecule is a dimer of C3H8NdCl(THF)2 bridged by two Cl atoms with Nd -Cl bond lengths of 2. 832(2) A and 2. 917(3)A.     

纳米晶Sb掺杂SnO2(ATO)粉体的合成与表征

以Sn粉和Sb₂O₃为原料.采用共沉淀法制备了纳米ATO粉.TG-DSC及FTIR结果表明.450℃以前前驱体已失去全部水分.并完全转化为氧化物.XRD测量结果表明.所得ATO粉具有四方金红石结构.500℃焙烧后粉体的粒径为12nm.随着焙烧温度的升高.粉体的粒径增加.TEM测定结果表明,粉体的分散性很好.团聚很少.粉体的烧结性能良好,950℃时烧结5h即达到理论密度的97.3％.用霍尔系数法测定粉体的导电行为.表明该粉体具有良好的导电性能.