曲利苯蓝掺杂石墨烯/聚吡咯复合气凝胶的制备与电化学性能

Preparation and electrochemical properties of triphenyl blue doped graphene/polypyrrole composite aerogels

将具有独特掺杂结构的聚吡咯(PPy)与丰富多孔结构的石墨烯(GE)气凝胶复合,可实现两种材料优势互补。通过一步水热法制备了曲利苯蓝(TB)掺杂GE/PPy复合气凝胶,采用SEM、FTIR、XRD、Raman和XPS对复合材料的形貌、化学结构、掺杂结构进行表征。结果表明,TB掺杂PPy/GE复合气凝胶呈现出三维多孔网络结构,复合气凝胶中氧化石墨烯(GO)被还原的同时,导电PPy被成功聚合,TB的引入有利于复合气凝胶掺杂水平的提高。电化学测试分析表明,TB掺杂浓度达到5 mmol·L^(−1)时,复合气凝胶(TB-5/PPy-GO)可获得最高比电容(392 F·g^(−1)),10000次充/放电循环后,比电容保持率可达85%;将TB-5/PPy-GO、活性炭分别作为正、负极组装为非对称超级电容器,其在功率密度为400 W·kg^(−1)时,能量密度高达35.89 W·h·kg^(−1),表现出良好的超电容特性。

The combination of polypyrrole(PPy)with a unique doping structure and graphene(GE)aerogel with a rich porous structure can realize the complementary advantages of the two materials.Triphenyl blue(TB)doped GE/PPy composite aerogel was prepared by one-step hydrothermal method.The SEM,FTIR,XRD,Raman spectroscopy and XPS were used to characterize the morphological structure,chemical structure,and doping structure of the composite electrode material.The results showed that TB doped GE/PPy composite aerogel provided three porous network structure.Conductive PPy can be successfully polymerized as graphene oxide(GO)was reduced in the composite hydrogel.Due to the introduction of TB,the doping level of the composite hydrogel has been increased.The electrochemical tests demonstrated that the prepared TB-5/PPy-GO(TB concentration of 5 mmol·L^(−1))aerogel exhibited superior specific capacitance of 392 F·g^(−1)at 1 A·g^(−1).The capacitance retention rate can reach 85%after 10000 cycles.The hybrid device,which was assembled with TB-5/PPy-GO and active carbon as positive and negative electrode,respectively,demonstrated maximum energy of 35.89 W·h·kg^(−1)at 400 W·kg^(−1),suggesting its good supercapacitive performances.