Enhanced electrocatalysis of PtRu onto graphene separated by Vulcan carbon spacer

► Vulcan carbon is added as a nano spacer to enhance the utilization and electrochemical activities. ► The suggested structure provides more triple-phase boundaries available for electrochemical reaction. ► The PtRu/graphene-Vulcan carbon (3:1 w/w) exhibits the highest methanol oxidation current density. ► The prepared catalyst shows better mass transport in the PEMFC.