| 초록 |
This work describes a ternary screen-printed electrode system, composed of aqueous poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonic acid) (PEDOT:PSS), graphene, and hydrous ruthenium (IV) oxide (RuO2) nanoparticles for use in high-performance electrochemical capacitors. As a polymeric binder, PSS allows stable dispersion of graphene and hydrous RuO2 NPs in an aqueous PEDOT:PSS system through electrostatic stabilization, ensuring better utilization of the three components. Additional PSS molecules were added to optimize the solution viscosity to obtain screen-printed electrodes. The effects of graphene and hydrous RuO2 NPs on the electrical and electrochemical properties of PEDOT:PSS were systematically investigated. The graphene sheets greatly enhanced the charge-transport properties, such as the doping level and conjugation length, through strong π–π stacking interactions with the PEDOT structure. The hydrous RuO2 NPs anchored to the PEDOT:PSS/graphene surfaces facilitated redox reactions with the surrounding electrolyte, and significantly enhanced the specific capacitance of the electrode materials. The resulting RuO2/PEDOT:PSS/graphene electrode with a thickness of ~5 μm exhibited high conductivity (1570 S cm−1), a large specific capacitance (820 F g−1), and good cycling stability (81.5% after 1000 cycles). |
