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Figure 6: Electrochemical performances of PCBs and PCPs. (a) CV curves of PCBs at various sweep rates. (b) Comparison of specific capacities of PCBs and PCPs at various current densities. (c) Comparison of Nyquist plots for PCBs and PCPs. The projection of the 45° slope in the high-frequency region is defined as /3, which is utilized to determine the ionic resistance for the electrolyte-filled pores in a nonfaradaic process. (d) Cyclic stability of PCBs at 20 A g−1 over 10 000 cycles.