英文文献汇报

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SourceofthearticleResearchbackgroundAbstractIntroductionResultsandDiscussionConclusionsSourceofthearticleResearchbackgroundA•Li-Sbatteriy:hightheoreticalenergydensityof2600Wh/kg;•S:naturallyabundant,economicallyeffective,andenvironmentallyfriendly;•Grapheneandothernanostructuredcarbonmaterials:excellentconductivity,highspecificsurfacearea,accommodatelargevolumeexpansion;•Issues:Li-Sbattery:poorcyclinglifeandrateperformanceS:largevolumetricexpansion，poorconductivityGraphene:couldn’tintegrateallthestructuralbenefits.•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%IntroductionHollownanostructures的优势Hollownanostructures的合成困境Hollownanostructures新的合成方案Hollownanostructures的优势•Applications：catalysis,adsorption,chemicalsensors,drug/genedelivery,andenergystorage/conversionsystems•Hollownanocrystals：mesoscalehollowstructure,nanoscalequantumeffects,andatomic-scaleperiodicarrangement•Hollowgraphenenanoshells(HGNs)：favourableelectricalconductivity,goodsurfacefunctionality,mechanical/chemicalstability,andbiocompatibilityHollownanostructures的合成困境•Thetemplate-freeorself-templatingbottom-upapproaches：hardlyextendedtoHGNsynthesis；•Atemplate-involvingtop-downstrategy：nocatalyticcapabilitytoregularlymanagethearrangementofcarbonatoms；•Thus,controllablesynthesisofHGNswithanengineeredhollowcavity,predeterminedlayernumber,smallsize,andhighlycrystallinefew-layergrapheneshellsisrarelyachievedHollownanostructures新的合成方案•Amesoscalecatalyticself-limitedassemblyofhollowgraphenesphereswasproposed.•Hardtemplatesandworkingcatalysts:insituformednickel-basedNPs•Carbonsource:dodecylsulfate(DS)•3Dmesostructure:zero-dimensional(0D)HGNsconstructtwo-dimensional(2D)nanosheetsandthenassembleintoathree-dimensional(3D)mesostructureResultsandDiscussionTheinsitucatalyticself-limitedassemblyofHGNsMorphologyandstructureofα-Ni(OH)2-DSMorphologyandstructureofHGNsElectrochemicalperformanceofHGN-SMorphologyofcycledHGN-SelectrodesTheinsitucatalyticself-limitedassemblyofHGNsMorphologyandstructureofα-Ni(OH)2-DSMorphologyandstructureofHGNsMorphologyandstructureofHGNsElectrochemicalperformanceofHGN-SMorphologyofcycledHGN-SelectrodesConclusions•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/g分别对应0.1、2.0、5.0C的电流密度）•在1.0C的电流密度下，初始放电容量1098mAh/g，1000次循环之后放电容量419mAh/g；衰减速率平均每圈0.06%，这显著的低于其他无硝酸锂电解液的基于石墨烯的Li-S电池；