Functionalization of Graphene Oxide and its Composite with Poly(34-ethylenedioxythiophene) as Electrode Material for Supercapacitors

摘要

In this study, poly(3,4-ethylenedioxythiophene)/thiophene-grafted graphene oxide (PEDOT/Th-GO) composites from covalently linking of Th-GO with PEDOT chains were prepared via in situ chemical polymerization with different weight percentage of Th-GO ranging between 40 and 70 % in reaction medium. The resulting composite materials were characterized using a various analytical techniques. The structural analysis showed that the composites displayed a higher degree of conjugation and thermal stability than pure PEDOT, and the weight percentage of Th-GO could affect the doping level, amount of undesired conjugated segments, and porous structure of composites. Electrochemical analysis suggested that the highest specific capacitance of 320 F g⁻¹ at a current density of 1 A g⁻¹ with good cycling stability (capacitance retention of 80 % at 1 A g⁻¹ after 1000 cycles) was achieved for the composite prepared from 50 wt% Th-GO content in reaction medium.