Abstract
Polypyrrole/functionalized single-walled carbon nanotubes composites (PPy/F-SWNTs) were electrochemically prepared in dispersive solution of pyrrole (Py) and F-SWNTs with or without doping ions. The effect of in-situ doping ions including Cl-, ClO4-, toluenesulfonate (TOS-) and dodecylbenzenesulfonate (DBS-) on the capacitance performance of the composites was investigated by cyclic voltammetry (CV), galvanostatical charge/discharge and electrochemical impedance spectroscopy (EIS) techniques. Except the pristine composite and the composite doped by DBS-, the others exhibited notable electrochemical capacitance behaviors. Furthermore, the specific capacitance of PPy-Cl/F-SWNTs (polymerization charge was 2 mAh•cm-2) reached 241 Fg-1 at the scanning rate of 10 mVs-1. PPy-TOS/F-SWNTs (polymerization charge 2 mAhcm-2) had greater capacitance and charge/discharge rate than the former did. Even at the scanning rate of 200 mVs-1, its specific capacitance was still up to 172 Fg-1. But with heaver doping ion (TOS-), PPy-TOS/F-SWNTs (polymerization charge 2 mAhcm-2) had a slightly smaller specific capacitance, such as 196 Fg-1 at the scanning rate of 10 mVs-1.
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