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时间:2020-03-26
《改进液相氧化还原法制备高性能氢气吸附用石墨烯.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学~t(WuliHuaxueXuebao12244ActaP.一Chim.Sin.2011,27(9),2244-2250September[Article]www.whxb.pku.edu.cn改进液相氧化还原法制备高性能氢气吸附用石墨烯袁文辉李保庆’李莉(‘华南理工大学化学与化工学院,广州t510640;华南理工大学环境科学与工程学院,广州510640)摘要:以液相氧化还原法为基础,并在分散剂十二烷基苯磺酸钠(SDBS)作用下制备得到高质量石墨烯,有效避免了存此过程中石墨烯大革团聚的现象.采用X射线衍射(XRD)、拉曼光谱(RS)、扫描电了显微镜(SEM)、透射电子显微
2、镜(TEM)~H原_Ir力显微镜(AFM)等分析手段对石墨烯样品进行了表征.XRD结果体现了石墨、氧化石墨和石墨烯晶型结构的区别:SEM和TEM结果显示石墨烯呈网格状,表面平整,缺陷少:AFM分析表明样品中单层石墨烯厚度约为1.3nm,同时也存在少许双层结构.BET测试法得到石墨烯的比表面积高达1206m·g~,考察了石墨烯在高条什下对H的吸附性能.通过对方法改进前后所制备的石墨烯样品进行比较,结果表明,二烷基苯磺酸钠的加入有效地减小了石墨烯的大量团聚,且得到了高质量的石墨烯.存25和55。C条件下,高质量石墨烯对氧气的吸附量分别达到1.7%(w)El1.1%(w),比之前研究结果
3、有了很大提高.关键词:石墨烯:氧化石墨:氧气吸附:氧化还原;超声剥离中图分类号:0647SuperiorGrapheneforHydrogenAdsorptionPreparedbytheImprovedLiquidOxidation-ReductionMethodYUANWen—Hui’’LIBao—Qing’LILifSchoolofChemistryandChemicalEngineering,SouthChinaUniversityofTechnology,Guangzhou510640,户R.China;CollegeofEnvironmentalScienceandEn
4、gineering,SouthChinaUniversityofTechnology,Guangzhou510640,户R.China、Abstract:Graphiteoxide(GO)waspreparedfrOmliquidoxidationbasedonHummersmethodandthegraphenewasthenpreparedusingsodiumborohydridetoreducetheexfoliatedgraphiteoxidebyultrasonicationduringwhichmoderatesodiumdodecylbenzenesulfonate
5、(SDBS)wasaddedintothesuspensiontoreducetheagglomerationamongthegraphenelayersandtoobtainastablegraphenesuspension.Theas.preparedgraphenewascharacterizedbyX-raydifraction(XRD),Ramanspectroscopy(RS),scanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM),andatomicforcemicroscopy(AFM)
6、.XRDresultsshowthatthecrystalstructuresarediferentamonggraphite,graphiteoxide,andgraphene.SEMandTEMimagesshowthatgraphenepossessesagriddingstructure,asmoothSUrface.andfeWdefects.AFManalysisindicatesthatlhelhicknessofthesinglelayergrapheneiSaboul1.3amwhiletherearestillafeWdoublelayersinlhesampl
7、e.TheBETspecificSUrfaceareaoflhegraphenewasabout1206m·g。anditsH2adsorptionpropertieswereinvestigatedunderhighpressure.Thesamplespreparedbyliquidoxidation-reductionwerecomparedwiththatpreparedbytheimprovedliquidoxidation—reductionmethod,
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