Xin et al. prepared the N, S co-doped carbon nanospheres with hierarchical pores (N, S-HPCN) prepared by the pyrolysis of pyrrole and ammonium persulfate with F127 as the pore-foaming agent in flowing N2 for supercapacitor applications . The SBET of N, S-HPCN was found to be 1830.8 m 2 g -1 with a pore volume of 1.16 cm 3 g -1 , while N, S-codoped carbon sphere without hierarchical pores (N, S-CN) exhibited 1338.6 m 2 g -1 (0.86 cm 3 g -1 ). XPS analysis of N, S-CN showed the relative at% of 3.16%, and 1.68%, while N, S-HPCN exhibited 4.29%, and 3.38% for N, and S, respectively. The electrochemical experiments were constructed in a three-electrode cell configuration using 6 M KOH solution as the electrolyte and nickel foam as the current collector. N, S-HPCN showed the specific capacitance of 416