Graphene-Based Carbon Materials for Electrochemical Energy Storage

Figure 5

(a) Schematic illustration for fabricating crumpled nitrogen-doped graphene; TEM images of (b) GO, (c) GO-C₃N₄, and (d) C-NGNSs; (e) CVs of C-NGNSs-900 supercapacitors in 1.0 M [Bu₄N]BF₄ acetonitrile solution between −1.5 and 1.5 V at different scan rates; (f) specific capacitance dependence on potential sweep rates in different graphene-based supercapacitors with 1.0 M [Bu₄N]BF₄ acetonitrile solution as electrolyte [28].