五氧化二钒的最新价格性质?

MnO2+4Cl-+4H+Mn2++2Cl-+Cl2↑+2H2O;(2)某小组设计如图所示的实验装置图(图中夹持和加热装置略去),分别研究YX2&和W2的性质.①分别通入YX2&和W2时,在装置A中观察到的现象是否相同(填“相同”或“不相同”)相同.装置D中装的是五氧化二钒,当通入YX2&时,打开K放入适量的氧气,在D装置中发生化学反应方程式为△2SO32SO2+O22SO3.②若装置B中装有5.0mL&1.0×10-3&mol/L的碘水,当通入足量W2完全反应后,转移了5.0×10-5&mol电子,该反应的化学方程式为5Cl2+I2+6H2O=2HIO3+10HCl.(3)某同学将足量的YX2&通入一支装有氯化钡溶液的试管,未见沉淀生成,向该试管中加入适量(填字母)AC,可以看到白色沉淀产生.A.氨水&&&&&&&&B.稀盐酸&&&&&&&&C.稀硝酸&&&&&&&&&D.氯化钙.
某化学实验小组为了探究在实验室制备Cl2的过程中有 水蒸气和 HCl挥发出来,同时证明氯气的某些性质,甲同学设计了如图所示的实验装置.按要求回答问题.(1)如何检查装置A气密性?用止水夹夹住c处,向分液漏斗中加水,打开分液漏斗的活塞,若分液漏斗中的水不再下流,则证明A气密性良好写出装置A中反应的离子方程式&Mn2++Cl2↑+2H2OMnO2+4H++2Cl-Mn2++Cl2↑+2H2O.(2)①装置B中盛放的试剂为无水硫酸铜,装置C中的盛放的试剂为五氧化二磷,装置C的作用是除水蒸气②装置D和E中出现的不同现象说明的问题是氯气无漂白性,次氯酸有漂白性.③装置F的作用是吸收氯气.(3)乙同学认为甲同学的实验有缺陷,不能确保最终通入AgNO3溶液中的气体只有一种.为了确保实验结论的可靠性,证明通入AgNO3溶液的气体只有一种,乙同学提出在某两个装置之间再加一个装置.你认为该装置应加在F与G之间(填装置字母序号),装置中应放入湿润的淀粉KI试纸(填写试剂或用品名称)
白磷和红磷都是磷的单质,已知把红磷完全转化为白磷时,要吸收能量,下列说法正确的是(  )A、白磷比红磷稳定B、等质量时白磷的内能比红磷的内能低C、白磷转化为红磷的反应是放热反应D、等质量的白磷和红磷完全燃烧生成五氧化二磷,放出的能量一样多
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五氧化二钒安全技术说明书(MSDS)
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五氧化二钒安全技术说明书(MSDS)
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题名: 五氧化二钒薄膜的溶胶凝胶法制备与性质研究;
The preparation and character research of Vanadium pentoxide thin films by sol-gel
学位类别: 硕士
授予单位: 中国科学院广州能源研究所
授予地点: 广州能源研究所
其他题名: The preparation and character research of Vanadium pentoxide thin films by sol-gel
中文摘要: Vanadium oxides have been studied because of its some important properties. Vanadium pentoxide has been used widely as its fine catalytic properties. Meanwhile, Vanadium pentoxide also has fine electrochemical property. Theoretically a Vanadium atom in Vanadium pentoxide crystal can accept two Li ions. Vanadium pentoxide is an attractive cathode material in high capacity Li ions rechargeable battery. Vanadium pentoxide can be also used as ions storage layer in Electrochromic devices.
Vanadium pentoxide thin films were obtained in this subject by sol-gel method. The precursors in this project are Vanadium pentoxide powder and Vanadyl acetylacetonate. First, we prepare inorganic sol and organic sol by Vanadium pentoxide powder and Vanadyl acetylacetonate respectively. Then the gel thin films were prepared by dip-coating and spin-coating. Gel films were heat treated at definite conditions and Vanadium pentoxide thin films were synthesized. The properties of Vanadyl acetylacetonate sol was analyzed by FT-IR and DG-DSC. The Crystallinity and optical property of Vanadium pentoxide thin films were analyzed by X-ray diffraction, FT-IR spectrum and UV-VIS-NIR spectrum.
The DG-DSC analysis reveals that Vanadyl acetylacetonate decomposes at 250oC and 300oC in nitrogen ambience and air respectively. In this subject, the heat treatment temperature was choosen between 350-550oC. Polycrystalline Vanadium pentoxide thin films were synthesized by heat treating Vanadyl acetylacetonate gel films in air and nitrogrn ambience. Amorphous Vanadium pentoxide thin films were synthesized by heat treating Vanadyl acetylacetonate gel films in argon and hydrogen misture ambience and purified nitrogen ambience. Polycrystalline Vanadium pentoxide thin films synthesized in this object have highly c-axis oriented nano V2O5 structures with grain diameter ranging from 21nm to 45nm. Polycrystalline Vanadium pentoxide thin films grow perpendicularly to the substrate. The optical band gap of Vanadium pentoxide thin films is between 2.0-2.4ev. The adhesion of Vanadium pentoxide thin films becomes stronger when the oxygen pressure increases in heat treatment atmosphere. The Vanadium pentoxide thin films obtained in air can shed after surface wetting. While the Vanadium pentoxide thin films obtained in nitrogen can bear grinding. The color of Vanadium pentoxide thin films varies from light yellow to light green as the oxygen pressure decrease in heat treatment atmosphere.
语种: 中文
URI标识: []&&
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五氧化二钒薄膜的溶胶凝胶法制备与性质研究.甄恩明[d].中国科学院广州能源研究所,
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物理化学学报(WuliHuaxueXuebao)
[Note]ActaPhys.-Chim.Sin.,2007,23(7):1090-1094Julywww.whxb.pku.edu.cn
铜掺杂五氧化二钒的制备及电化学性质
魏英进李旭王春忠詹世英
130021)陈岗*(吉林大学材料科学与工程学院,长春
摘要:采用沉淀法于300和600℃制备了结晶状的Cu0.04V2O5材料.扫描电镜显示,300℃时制备的样品具有多
孔特征,而600℃时制备的样品具有很高的结晶度.X射线研究表明,少量铜掺杂不会改变V2O5的正交晶体结
构.红外光谱研究表明,300℃时制备的Cu0.04V2O5样品含有少量水.热失重分析确定了样品中所含水分是以吸附
水的形式存在,1mol材料分子吸附水的摩尔数约为0.18mol.铜掺杂显著改善了V2O5的结构稳定性,进而提高
?了材料的充放电循环性能.于600℃制备的样品在C/5.6倍率下具有160mAhg-1的可逆比容量,但提高放电倍
率明显降低了材料的循环性能.于300℃制备的样品在C/5.6倍率时的循环性能不如600℃样品,但该材料在
?C/1.9倍率时仍具有100mAhg-1左右的可逆比容量.两种材料在电化学性能上的差异与材料的微结构有关.低
温样品在较高放电倍率时良好的循环性能得益于其多孔的微结构,而高温样品由于其较高的结晶度而表现出优
异的低倍率充放电性能.
关键词:锂离子电池;正极材料;V2O5;掺杂;电化学性能
中图分类号:O646
PreparationandElectrochemicalPropertiesofCuDopedV2O5
WEIYing-JinLIXuWANGChun-ZhongZHANShi-YingCHENGang*
(CollegeofMaterialsScienceandEngineering,JilinUniversity,Changchun130021,P.R.China)
Abstract:CrystallineCu0.04V2O5waspreparedbyprecipitationmethodfollowedbyheattreatmentat300and600
℃.Thematerialpreparedat300℃showedporousmorphology,whereasthatpreparedat600℃washighlycrystalline.
X-raydiffractionshowedbothmaterialsexhibitingthesameorthorhombicstructureasthatofV2O5.Fouriertransform
infraredspectroscopyconfirmedtheexistenceofca0.18molofabsorbedwaterinonemolofthematerialpreparedat
300℃.CudopingsignificantlyimprovedtheelectrochemicalperformanceofV2O5.Thematerialpreparedat600℃
hadareversibledischargecapacityover160mAh?g-1after60cyclesatthecurrentdensityofC/5.6.Thematerial
preparedat300℃showedgoodcyclingperformanceathighercurrentdensities,withareversiblecapacityca100
?mAhg-1whencycledatC/1.9.ThediscrepancyintherateperformanceofCu0.04V2O5wasattributedtothemorphology
ofmaterials.
KeyWords:Lithium-ionbattery;Cathodematerial;V2O5;Cationicdoping;Electrochemicalproperties
自20世纪90年代以来,锂离子二次电池在各
种便携式电子产品中得到了广泛应用.近年来,围绕
锂离子二次电池的研究主要集中在寻找电压高、能
量密度高、循环性能良好以及价格低廉的电极材料
等方面[1-4].以五氧化二矾(V2O5)为正极材料的锂离子电池具有很高的能量密度并且原料价格低廉,有着良好的应用前景.目前,V2O5已经在小型全固态锂离子电池中得到应用,并且在新型超级电容器研究方面也倍受青睐.与其他插入材料类似,这种材料具有的层状结构非常有利于Li+的插入和脱出.然*Received:January22,2007;Revised:March26,2007;PublishedonWeb:May10,2007.Correspondingauthor.Email:gchen@jlu.edu.cn;Tel:+86431-85168015.
国家自然科学基金(50672031)和国家重点基础研究发展规划(2002CB211802)资助项目
! EditorialofficeofActaPhysico-ChimicaSinica
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