Cellular Electrophysiology

Nitrogen-doped reduced graphene oxide as electrode material for high rate supercapacitors

“…6 shows the galvanostatic charge/discharge curves of rGO-180 and N-rGO-180 at different current densities. A nearly symmetric triangular shape and small voltage drop can be observed even at a current density of 20 A g −1 , which indicates a double-layer capacitive behaviour and fast ion and electron transport through the electrode material [11]. At a current load of0.2 A g −1 , N-rGO-180 and rGO-180 reach high capacitance values of 239 and 228 F g −1 , respectively.…”

“…It must be noticed that N-rGO-180 has a higher capacitance thanrGO-180, despite having a lower specific surface area (354 m 2 g −1 and 530 m 2 g −1 , respectively). Li et al [11] obtained a N-rGO with a specific surface area of 677 m2g−1, but the capacitance value at 100 mV s −1 was only ∼200 F g −1 . However, Lee et al [9] synthesized a N-rGO with a BET surface area similar to that of ourN-rGO-180 (355 m2g−1), but with a much lower nitrogen con-tent of 3 at%, exhibiting a significantly lower capacitance value of182 F g−1at 25 mV s−1in KOH electrolyte.…”

“…These features of N-graphenes lead to the consideration of these materials as promising candidates for active electrode material in supercapacitors. The performance of N-graphenes has been intensively studied using different electrolytes [5,10,11]. However, the relatively high values of the capacitance reported for N-graphenes decrease significantly at high current regimes [4,7,8].…”