Electrochemical properties of Pt/graphene intercalated by carbon black and its application in polymer electrolyte membrane fuel cell

► Carbon black (CB) was intercalated between graphene single nanosheets (GNSs). ► Pt/GNS shows the higher ECSA compared to Pt/CB and Pt/Vulcan XC-72 CB. ► Electrochemical active surface area depends on intercalating compound contents. ► Pt/GNS/CB with 30% of CB shows the highest ECSA of 38.8 m2 g−1 with 400 mA cm−2.