石墨烯/聚苯胺水凝胶的制备及其在超级电容器中的应用

Preparation of Graphene/Polyaniline Hydrogels for Supercapacitor

为解决二维纳米材料石墨烯在使用中容易堆叠的问题,制备了石墨烯/聚苯胺复合水凝胶,先利用氧化石墨烯片层间的π-π相互作用、含氧官能团、氢键等作用力自组装而成三维水凝胶,再将苯胺单体化学氧化原位聚合并复合入石墨烯水凝胶中制成复合水凝胶,应用于超级电容器的电极材料中具有较好的电容性能.在冰浴条件下制备有利于聚苯胺形成长链,其复合水凝胶比电容可达390.9 F/g,比普通石墨烯水凝胶提高了近60%.

Recently,graphene nanosheets,as one kind of two-dimensional nano-material with various superior performance,have attracted many attentions.In order to avoid the restacking and gathering of the two-dimensional materials during the application,the researchers have attempted different methods,including formation of hydrogels with three-dimensional structure and preparation of nano-composites.Herein,following these ideas,a graphene hydrogel(GH)is prepared via theπ-πinteraction,oxygen-containing functional groups or hydrogen bonds between interlayers of graphene oxide(GO).Then polyaniline(PANI)is added after chemical oxidation in situ polymerization in order to prepare a three-dimensional graphene/polyaniline composite hydrogel(GPH)with properties of both graphene and PANI.This hydrogel with good capacitance has been used as electrode materials of supercapacitors.The specific capacitance of GPH reaches 390.9 F/g,which is nearly 60%higher than GH,within ice bath that lengthens the chain of PANI.