Fig. 2From: Facile Synthesis of Nitrogen-Doped Microporous Carbon Spheres for High Performance Symmetric Supercapacitors(a) XRD patterns and (b) XPS survey spectra of the as-prepared NMCSs materials, and the high-resolution N 1 s spectra at different carbonization temperatures of (c) 500 °C, (d) 600 °C, (e) 700 °C and (f) 800 °CBack to article page