Figure 4
From: Plasma-induced, nitrogen-doped graphene-based aerogels for high-performance supercapacitors

(a) CV curves of the RGO/Fe3O4 electrode. (b) CV curves of the NG/Fe3O4 electrode. (c) Variation of the specific capacitance against the scan rate for the RGO/Fe3O4 and NG/Fe3O4 electrodes. (d) Galvanostatic charge−discharge curves of the NG/Fe3O4 electrode.