Graphene-Based Carbon Materials for Electrochemical Energy Storage

Figure 4

(a) N-doped and (b) B-doped graphene electrodes obtained over a wide range of current densities, from 0.5 to 25 Ag⁻¹; (c) schematic structure of the binding conditions of N and B in a graphene lattice; (d) Ragone plots for the pristine graphene, N-doped grapheme, and B-doped grapheme [27].

(a)

(b)

(c)

(d)