fig2

Figure 2. Structural characterizations of N/P-MC@RGO, N/P-MC and RGO samples: (A) XRD, (B) Raman, (C) nitrogen adsorbed/desorbed isotherms, (D) pore-size distribution. XPS spectra of N/P-MC@RGO including high-resolution (E) N 1s and (F) P 2p.