High-performance symmetrical supercapacitor based on poly(3,4)-ethylenedioxythiophene/graphene oxide/iron oxide ternary composite

Poly(3,4)-ethylenedioxythiophene/graphene oxide/iron oxide (PEDOT/GO/Fe 2 O 3 ) ternary composite was synthesized using a simple one-step electropolymerization. The electrochemical studies showed that the specific capacitance of PEDOT/GO/Fe 2 O 3 composite was three times higher (221 F g − 1 ) than the binary composite of PEDOT/GO which was 73 F g − 1 at 25 mV s − 1 . The upsurge performance was believed to be contributed from anchoring particles of Fe 2 O 3 on the wrinkly PEDOT/GO that acted as a spacer in order to maximize the utilization of the electroactive materials for electrochemical reaction. Furthermore, the PEDOT/GO/Fe 2 O 3 composite was also able to attain a specific power of 8 Wh kg − 1 at a specific power of 493 W kg − 1 at 1 A g − 1 and exhibited excellent long-term stability performance even after 1000 cycles owing to the high mechanical strength provided by GO. These performances make PEDOT/GO/Fe 2 O 3 composite as a promising electrode material for supercapacitor.