Fig. 1
From: Progress in Iron Oxides Based Nanostructures for Applications in Energy Storage
Reprinted with Permission from [11]. Copyright, Elsevier B.V
SEM images of a Fe2O3/graphene and b K-FeO/graphene, and the inset in (a, b) are their magnified images, respectively. Repeated cyclic voltammograms of c, d the Fe2O3/graphene electrode and e, f the K-FeO/graphene electrode. Two electrodes were continually scanned for the 51st cycles with a potential sweep rate of 0.5 mV s−1.