N-DOPED GRAPHENE-SUPPORTED PT AND PT-RU NANOPARTICLES WITH HIGH ELECTROCATALYTIC ACTIVITY FOR METHANOL OXIDATION

摘要

In this work, Pt and Pt-Ru nanoparticles were synthesized on both graphene and nitrogen (N)-doped graphene sheets, and their effects on electrocatalytic activity for methanol oxidation were investigated using cyclic voltammetry and electrochemical impedance spectroscopy. Experimental results show that, in comparison to graphene as catalyst, N-doped graphene-supported Pt and Pt-Ru nanoparticles demonstrate enhanced characteristics for methanol electro-oxidations with regard to diffusion efficiency, oxidation potential, forward oxidation peak current density, and charge transfer resistance. Our findings favor the use of N-doped graphene sheets as catalyst supports for direct methanol fuel cells.