英文文献汇报.ppt

文献汇报,硬膜板上催化作用下的自限性组装：用在锂硫电池中的中尺度石墨烯纳米壳,汇报人：XXX,目录,Sourceofthearticle,ResearchbackgroundA,Li-Sbatteriy:hightheoreticalenergydensityof2600Wh/kg;S:naturallyabundant,economicallyeffective,andenvironmentallyfriendly;Grapheneandothernanostructuredcarbonmaterials:excellentconductivity,highspecificsurfacearea,accommodatelargevolumeexpansion;Issues:Li-Sbattery:poorcyclinglifeandrateperformanceS:largevolumetricexpansion，poorconductivityGraphene:couldntintegrateallthestructuralbenefits.TheconceptofHGNsmightbeapromisingstrategy,whichyetcallsfornewsyntheticmethodology.,ResearchbackgroundB,研究背景：中空纳米结构对提升电池性能有巨大优势，但传统方法难以制作研究目的：提升锂硫电池容量；提高电池稳定性解决方案：中空石墨烯纳米球壳结构，嵌入硫合成复合材料，作为电池正极,Abstract,Hollownanostructures：表面积大；活性部位充分暴露；物质输运的动力学性能优良；表面通透性好Amesoscaleapproachtofabricategrapheneshells:催化剂作用下，在原位形成的纳米颗粒上实现纳米石墨烯的自限性组装Use:石墨烯纳米球壳作为基体与S复合，用作锂硫电池正极材料Properties:初始放电容量：1520mAh/g(0.1C)电流密度从0.1C提升至2.0C，70%容量保持1000次循环，每次衰减0.06%,Introduction,Hollownanostructures的优势,Applications：catalysis,adsorption,chemicalsensors,drug/genedelivery,andenergystorage/conversionsystemsHollownanocrystals：mesoscalehollowstructure,nanoscalequantumeffects,andatomic-scaleperiodicarrangementHollowgraphenenanoshells(HGNs)：favourableelectricalconductivity,goodsurfacefunctionality,mechanical/chemicalstability,andbiocompatibility,Hollownanostructures的合成困境,Thetemplate-freeorself-templatingbottom-upapproaches：hardlyextendedtoHGNsynthesis；Atemplate-involvingtop-downstrategy：nocatalyticcapabilitytoregularlymanagethearrangementofcarbonatoms；Thus,controllablesynthesisofHGNswithanengineeredhollowcavity,predeterminedlayernumber,smallsize,andhighlycrystallinefew-layergrapheneshellsisrarelyachieved,Hollownanostructures新的合成方案,Amesoscalecatalyticself-limitedassemblyofhollowgraphenesphereswasproposed.Hardtemplatesandworkingcatalysts:insituformednickel-basedNPsCarbonsource:dodecylsulfate(DS)3Dmesostructure:zero-dimensional(0D)HGNsconstructtwo-dimensional(2D)nanosheetsandthenassembleintoathree-dimensional(3D)mesostructure,ResultsandDiscussion,Theinsitucatalyticself-limitedassemblyofHGNs,Morphologyandstructureof-Ni(OH)2-DS,MorphologyandstructureofHGNs,MorphologyandstructureofHGNs,ElectrochemicalperformanceofHGN-S,MorphologyofcycledHGN-Selectrodes,Conclusions,HGNs通过介尺度催化自限性组装法合成，具有非常小的粒径、单层或多层的石墨烯片层、3D分层的花瓣状相形态；原位形成的Ni基纳米颗粒既作为硬膜板，又充当催化剂，催化3D纳米结构的石墨烯在硬膜板上沉积；HGNs的粒径为10-30nm，SSA高达979平米每克，孔体积1.98立方米每克，被用在高倍率Li-S电池中作为基体来容纳S；HGN-S正极材料有高的放电容量（1520、1058、737mAh/