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specific area ranging from 80 to 900 m 2 g -1 , various graphitization level, and so forth). Utilizing the kinetic isotope effect (KIE) along with numerous electrochemical characterizations, we determined that the rate determining step (RDS) associated with ORR is a proton-independent step whenever density of Pt NPs on the surface of the carbon assistance is high. Upon loss of the density of Pt NPs on the surface, the RDS of the OR