【作者】 陈明希； 李灵枝； 王欢； 高建平；

【Author】 Mingxi Chen;Lingzhi Li;Huan Wang;Jianping Gao;School of Science,Tianjin University;Collaborative Innovation Center of Chemical Science and Engineering,Tianjin University;

【机构】 天津大学理学院化学系； 天津化学化工协同创新中心,天津大学；

【摘要】 石墨烯有着高达2600 m2/g的理论比表面积,良好的导电性、热稳定性、化学惰性和宽的电压窗口,是一种较理想的双电层电容器电极材料。本论文主要研究了氧化石墨烯(GO)在几种不同的金属离子(Fe3+,Co2+,Ni2+)作用下,发生交联反应,实现氧化石墨烯的自组装。组装而成的氧化石墨烯水凝胶在强碱条件下被还原,同时,金属离子以氢氧化物或氧化物的形式负载在还原石墨烯(RGO)片层表面。凝胶经冷冻干燥后,得到石墨烯气凝胶(如图1所示,以Ni2+离子为例)。本文采用不同金属离子作为前驱物,自组装得到的石墨烯气凝胶微观形貌也有所区别。最后,我们将石墨烯气凝胶直接放置在模具中组装为双电极电容器并测量其质量比电容值和体积比电容值。结果表明,通过上述方法得到的负载金属氢氧化物或氧化物石墨烯气凝胶具有很好的电容性能。更多还原

【Abstract】 Here we demonstrate a facile method to prepare a graphene electrode and fabricate into two-electrode cell configuration.Graphene oxide(GO) is able to cross-link and self-assemble in a solution of ions salt(Fe3+,Co2+,Ni2+),fabricating a gel block structure,while being able to enhancing the mechanical properties of graphene.After the addition of NaOH solution,the GO was reduced into reduced graphene oxide(rGO).At the same time,metal ions transform to metal oxides or metal hydroxide nanoparticles,supported on the surface of rGO sheets.The gel is dried by freezing-drying to obtain RGO aerogel.Aerogel can be used directly for electrodes of supercapacitor,which exhibits outstanding energy storage properties.更多还原