Synthesis and studying of active and durable support based on graphene for PEMFC

In this work,we have developedanefficientapproachto prepare the nitrogen doped graphene supported Pt nanocomposites (Pt/N-G). Nitrogen-doped graphene (N-G) was prepared bypyrolysis of graphene oxide with cyanamide as nitrogen containing precursor at different temperatures, which led to high and controllable nitrogen contents. Subsequently, the Pt nanoparticles were dispersed over N-G surface by modified chemical polyol reductionprocess..X-ray powder diffraction, FTIR spectroscopy, Raman spectroscopy, X-ray photoelectron Spectroscopy, and Transmission and scanning electron microscopy (TEM&SEM)were used to characterize the morphology and microstructure of the prepared catalysts. The TEMand elemental mapping images indicate that metal nanoparticles are more uniformly dispersed on the surface of N-doped graphene than other supports; and Pt nanoparticles dispersed without anyaggregation. The catalytic activity and durability of the catalysts was evaluated by various electrochemical techniques. Compared to the undoped Pt/rGO and commercial Pt/C catalysts, an enhanced electro catalytic activity was obtained in the case of the Pt/N-rGO with optimizedcomposition and nanostructure. The maximum power density of MEA for Pt/N-rGO was 1.4times more than that of MEA fabricated by commercial Pt/C 20%.

کلیدواژه ها:

PEMFC ، graphene ، N-doped ، Pt nano particle