To uncover potential applications of this synthesis method, we investigated the catalytic performance in the oxygen evolution reaction of the 2D-Cr2O3. As reference we also measured the activity of bulk Cr2O3. Figure shows the oxygen evolution reaction (OER) polarization curve of Cr2O3/rGO and bulk Cr2O3 in 1 M KOH solution (0.1 mg mass loading). In contrast to, samples show significant catalytic activity. Figure shows overpotential of is decreased to 370 mV compared to 560 mV of bulk Cr2O3. Moreover, the Tafel slope (Figure ) is significantly decreased as well from 182 mV/dec (bulk Cr2O3) to 69 mV/dec (Cr2O3/rGO).