自支撑三维功能化石墨烯/聚苯胺电极材料的制备及超级电容性能

采用水热法制备了三维石墨烯(3D-G),并以十八胺(ODA)为接枝剂对部分还原的氧化石墨烯进行氨基化处理,再利用原位聚合法在氨基化石墨烯表面生长聚苯胺,制备了十八胺功能化石墨烯/聚苯胺(G-ODA/PANI).对材料进行了结构表征、电化学性能分析和材料结构的比电容贡献分析.结果显示,电极材料的电容贡献大部分体现为材料的表面电容,G-ODA/PANI电极片在1 A/g电流密度时的比电容最高可达1080 F/g,是未功能化石墨烯/聚苯胺电极材料(G/PANI)的2.57倍,且循环稳定性也有很大的提高,循环10000周后的比容量保持率为90.8%,比G/PANI高9.6%.

Preparation and Performance in Supercapacitor of Three-dimensional Functionalized Graphene/polyaniline Freestanding Electrode Materials

Three dimensional graphene(3D-G) was prepared by hydrothermal method, in which graphene layer increased the electron transfer within the channels. Octadecylamine ( ODA) functionalized graphene /polyaniline(G-ODA/ PANI) was prepared by the modification of reduced graphene materials with ODA and in situ polymerization of aniline on the surface og G-ODA. Structure, electrochemical properties and the specific capacitance contribution of the materials were analyzed. The results showed that the contribution of capacitor electrode material was originated from the pseudocapacitive properties of polyaniline. The specific capacitance of G-ODA/ PANI electrode reached 1080 F/ g at current density of 1 A/ g, 2. 57 times as high as that of graphene / polyaniline(G/ PANI) electrode material. It also had a great increase in cycle stability, and the capacity retention rate was 90. 8% after 10000 cycle times, increased by 9. 6% compared with G/ PANI.