Fig. 1. Characterization of the graphitization and morphology of carbon materials. SEM images of (a and b) WTP, (d) BTP, (e) ATP and (f) UTP. (c) HRTEM image of WTP. (g) XRD patterns, (h) Raman spectra and (i) N₂ adsorption/desorption curves of WTP, ATP, BTP and UTP.