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. 2015 May 8;5(2):755–777. doi: 10.3390/nano5020755

Figure 3.

Figure 3

(A) TEM images of N-doped CNFs annealing at 900 °C. (B) Specific capacitances of CNFs-900, CNFs@Ppy, N-CNFs-500, N-CNFs-700, N-CNFs-900, and N-CNFs-1100 at varying current densities. (C) Electrochemical impedance spectra (inset: magnified 0–4 Ω region) under the influence of an AC voltage of 5 mV. (D) Cycling performance of the N-CNFs-900 as gravimetric capacitance calculated from the discharge curves of 3000 cycles. Reproduced from [103] with permission from American Chemical Society, 2012.