分子筛/石墨烯复合电极材料电化学性能的对比研究  

Electrochemical Performances of Molecular Sieve/Graphene Composite Electrode Materials

作　　者：赵晓婵[1,2,3] 房艳 房春晖[1,2] 周永全 戈海文[1,2] 朱发岩 刘红艳[1,2] 张文倩 

机构地区：[1]中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁810008 [2]青海省盐湖资源与化学重点实验室,青海西宁810008 [3]中国科学院大学,北京100049

出　　处：《盐湖研究》2017年第4期79-86,共8页Journal of Salt Lake Research

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-EW-307)

摘　　要：利用溶液共混法制备得到分子筛/石墨烯(RGO)复合电极材料。比较了分子筛(4A、13X、SBA-15)种类、煅烧温度以及分子筛与氧化石墨烯(GO)质量比等因素,对分子筛/RGO复合电极材料电化学性能的影响。采用X射线衍射(XRD)、孔径分析、扫描电镜(SEM)和电化学测试等分析方法考察了3种复合电极材料的结构、形貌及电化学性能。结果表明,RGO可以将4A很好地包覆,且4A均匀镶嵌在RGO层间并阻止RGO团聚,形成了三维空间导电网络结构,13X、SBA-15并不能完全被RGO包裹,RGO层间团聚现象仍较严重,不能形成三维导电网络结构。当分子筛与RGO质量比为6∶1,煅烧温度为320°C时,在4 A/g电流密度下,4A/RGO复合电极材料的比电容为450 F/g,而相应的13X/RGO、SBA-15/RGO复合电极材料的比电容分别为195、43 F/g。4A/RGO复合电极材料优异的超级电容性能可归于4A与RGO之间较强的协同效应。The composite electrode material of molecular sieve/RGO were prepared by solution blendingmethod. Comparing with the type and calcination temperature of molecular sieves （4A, 13X, SBA - 15）, the mass ratio of molecular sieve/RGO, these factors show some influence on the electrochemical performance of molecular sieve/RGO composite electrode material. The structure, morphology and elec- trochemical properties of three composite electrode materials were investigated by X - raydiffraction （ XRD）, pore analysis, Scanning Electron Microscope （SEM） and electrochemical measurements. The re- suits show that RGO was well coated with 4A ,4A can interlace between RGO layers and prevent the layer stack of RGO, further forming a three-dimensional conductive network structure in three molecular sieve/ RGO composite electrode materials. But 13X,SBA -15 cannot be completely wrapped by RGO and oc- curres the serious stack phenomenon between RGO layers, preventing the formation of the three-dimen- sional conductive network structure. The electrochemical performance of the composite material were got at the conditions of 6：1 mass ratio for molecular sieve and RGO, and the calcination temperature of 320℃. In the above cases and with the same 4 A/g current density, the 4A/RGO composite material has a spe- cific capacitance of 450 F/g, while the corresponding 13X/RGO, SBA - 15/RGO were 195,43 F/g. The super capacitor performance of 4A/RGO were better than 13X/RGO, SBA -15/RGO ,which may attrib- ute to the stronger synergy effect between 4A and RGO.

关 键 词：石墨烯 分子筛 超级电容器 协同效应 

分 类 号：O646[理学—物理化学]