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Polypyrrole nanowires are facile synthesized under a mild condition with FeCl3 as an oxidant. Polypyrrole nanowires with the width of 120 nm form many nanogaps or pores due to the intertwined nanos-tructures. More importantly, PPy nanowires were further applied for supercapacitor electrode materials. After electrochemical testing, it was observed that the PPy nanowire based electrode showed a large specific capacitance (420 F g ? 1, 1.5 A g ? 1) and good rate capability (272 F g ? 1, 18.0 A g ? 1), which is larger than that of most of published results. The as-prepared electrode can work well even after 8000 cycles at 1.5 A g ? 1.