To further investigate the crystal structure of the Cr2O3, the films were redispersed in water via vigorous sonication, followed by drop casting onto a SiO2 substrate. Figure shows the Raman spectrum of a deposited multilayer Cr2O3/rGO sheet. In addition to the peaks of graphene (D-peak at 1344 cm -1 and G-peak at 1593 cm -1 ) and Si (521 cm -1 ), the spectrum shows peaks at 660 cm -1 , 602 cm -1 , 543 cm -1 , 348 cm -1 and 304 cm -1 . These peaks allow to clearly identify Cr2O3. SEM images and energy dispersive X-Ray spectroscopy (EDS) analysis of the same multilayer stack reveals that the layered structure of rGO is preserved after the synthesis process and the Cr2O3 is homogenously distributed throughout the rGO sheets (see Figure and). The fact that the layered structure is preserved after the electrochemical synthesis further strengthens the hypothesis that the Cr2O3 sheets are synthesized in a 2D form within the rGO film.