Fig. 8From: Recent developments of nano-structured materials as the catalysts for oxygen reduction reaction(reprinted with permission from Ref. [67] Copyright @ 2013 Elsevier)a Cyclic voltammograms of Pt/C, Pt/RGO, and Pt–Cu/RGO catalysts in 0.5 M H2SO4 at a scan rate of 50 mV/s. b Specific and mass activities of the Pt/C, Pt. RGO, and Pt–Cu/RGO catalysts modified GC electrode at 0.62 VBack to article page