三维石墨烯/苯胺-吡咯共聚复合物的制备及其超级电容性能

摘要

以制备的氧化石墨凝胶和苯胺-吡咯共聚物为原料,将二者进行混合超声分散,再以其混合分散液为前驱体,采用一步水热法制得三维石墨烯/苯胺-吡咯共聚复合物(3DAP).利用X射线衍射(XRD)、拉曼光谱(Raman)、傅里叶变换红外(FT-IR)光谱、扫描电镜(SEM)、透射电镜(TEM)和电化学测试等研究了复合物的结构、形貌及电化学性能.结果表明:3DAP拥有丰富的三维多孔网状结构,并且颗粒状的苯胺-吡咯共聚物能够均匀地分布于孔隙间;作为电极材料,该复合物在0.5 A·g-1电流密度下比电容可达628.5 F·g-1,即使在大电流密度(20 A·g-1)条件下仍可高达384 F·g-1,且在1 A·g-1电流密度下经过1 000次的充放电循环后比容量保持率高达86.1%,表现出良好的倍率特性和循环稳定性,其超级电容性能远优于单纯的石墨烯以及苯胺-吡咯共聚物.%Three-dimensional graphene/poly(aniline-co-pyrrole) composite(3DAP) was prepared by one-step hydrothermal method using a suspension of graphene oxide and poly(aniline-co-pyrrole) as precursor.X-ray diffraction(XRD), Raman spectroscopy(Raman), Fourier transform infrared spectra(FT-IR), scanning electronic microscopy(SEM), transmission electron microscope(TEM) and electrochemical measurements were performed to investigate the structure, morphology and supercapacitive performance of the composite.The result showed that 3DAP presented three dimensional structure and granular poly(aniline-co-pyrrole) were dispersed in the pores uniformly.The capacities reached 628.5 F·g-1 and 384 F·g-1 at 0.5 A·g-1 and 20 A·g-1.The retention rate was found to be 86.1% after 1 000 times of charging and discharging cycle at 1 A·g-1.The results indicated that the composite showed good rate performance and cycle stability and its supercapacitive performance was far better than the 3DGS and poly(aniline-co-pyrrole).