改进液相氧化还原法制备高性能氢气吸附用石墨烯.pdf

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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，