Abstract
It is of great significance to prepare supercapacitors with high energy density and high stability for their application. In this work, we demonstrate that PEDOT/PANI:(HSO4-)X:(CF3SO3-)1-X composite electrodes obtained by in-situ polymerization and electrochemical polymerization with oriented nanorods structure can facilely assemble into flexible supercapacitors. An outstanding specific capacitance of 1042.7 F g−1 is achieved for PEDOT/PANI:(HSO4-)X:(CF3SO3-)1-X composite electrode under the condition of 10 mV s−1 in 1 M H2SO4 electrolyte. It is found that PANI grown on PEDOT has a rod-like structure with interpenetrating networks, which provides a high specific surface area and increased electron transmission channels. As a result, the specific capacitance of the assembled flexible supercapacitor reaches 361.6 F g−1, with 71 % capacitance retention after 10,000 cycles. The flexible supercapacitor delivers a high energy density of 28.5 mWh g−1 at a power density of 789.5 mW g−1. This work shows that PEDOT/PANI:(HSO4-)X:(CF3SO3-)1-X composite electrode is a promising electrode material for flexible supercapacitors.
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