石墨烯聚苯胺复合材料的制备及其电化学性能研究.pdfVIP

中文摘要 超级电容器常见的电极材料分为碳材料、金属氧化物和导电聚合物三种， 制备出具有协同效应的复合电极材料是目前研究的热点。本文采用电化学方 法制备出石墨烯/聚苯胺复合材料，并对其其电容性能进行了研究。 以鳞片石墨做为原料，利用改进的Hummers 法制备出了氧化石墨（GO ）， 超声分散后滴涂在ITO 导电玻璃表面，采用循环伏安法在-1.3 V~0 V 进行扫 描而将其还原成石墨烯薄膜，对其形貌结构进行表征并研究其电化学性质。 结构表征结果表明，经过电化学还原后，氧化石墨表面和边缘的含氧官能团 大部分得以去除，成功的制备了石墨烯薄膜（ERGO ）。电化学测试其比电 容在1000 mA/g 下达到了114 F/g，当电流密度从500 mA/g 升高到5000 mA/g 时，电容保持率为70% 。 采用电化学一步氧化还原法制备石墨烯/聚苯胺复合材料（ERGO/PAN ）， 对其进行表征并研究不同含量配比的复合材料的电容性能。结构表征结果证 明，复合物中聚苯胺和石墨烯得到了良好的复合。电化学性能测试表明，石 墨烯含量为 11%的复合材料综合性能最佳，在500 mA/g 的电流密度下比电 容达到了352 F/g，当电流密度升高到5000mA/g 时，比电容下降为229 F/g ， 电容保持率将近65%，倍率特性优异。经过 1000 次的充放电循环后容量保 持率达到了90% 。 关键词： 聚苯胺 石墨烯 电还原 电聚合 电容 ABSTRACT Carbon material, metal oxide and conductive polymer are three kinds electrode materials researched most extensively nowadays. Preparation of composite electrode material which has cooperative effect become the focus. In this thesis, Graphene/PANI film was prepared by electrochemical method, and its electrochemical performance was studied. Graphite oxidation(GO) was synthesized from flake graphite by modified Hummers method. Go was dispered and dropped onto ITO and dried. Graphene(ERGO) was obtained by the electrochemical reduction method and confirmed by characterization. The capacitance can reach 114 F/g and has good rate performance. Graphene/polyaniline composite materials(ERGO/PAN) was prepared by one step of electrochemical oxidation and reduction method. Structure characterization results show that polyaniline and graphene to get a good composition. The composite materials with 11% Graphene reached 352 F/g in 500 mA/g and 229 F/g in 5000 mA/g. 90% of the capacitance was kept after 1000 cycles of charge and recharge. Test result