l samiee - Energy Technology Research Division, Research Institute of Petroleum Industry (RIPI), Tehran, Iran
s.sadegh hassani - Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran / Nanotechnology Research Center, Research Institute of Petroleum Industry (RIPI), Tehran, Iran
m.r ganjali - Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran
a.m rashidi - Nanotechnology Research Center, Research Institute of Petroleum Industry (RIPI), Tehran, Iran

In the work presented here, nitrogen and sulfur co doped on porous graphene was synthesized using pyrolysis and hydrothermal technique as metal-free electrocatalysts for oxygen reduction reaction (ORR) under alkaline conditions. All the materials have been characterized by Scanning Electron Microscopy (SEM) and X-ray photo-electron spectroscopy (XPS). Moreover for electrochemical evaluation of samples, Rotating Disk electrode (RDE) and Cyclic Voltammetry techniques (CV) were employed. The results revealed that the catalyst prepared by pyrolysis method shows outstanding catalytic activity for the oxygen reduction reaction (ORR), as well as excellent resistance towards methanol crossover effects, indicating their promising potential as ORR electrocatalysts for alkaline fuel cells.

Co-doped graphene; Metal-free catalyst; Oxygen reduction reaction