title: Oxygen reduction reaction on neighboring Fe-N4 and quaternary-N sites of pyrolized Fe/N/C catalyst.
abstract: We study the interaction between the TM-Nx and metal-free active sites of a pyrolized TM/N/C catalyst and its effect on their ORR activities. We particularly choose a Fe-N4-edge-graphene and a quaternary-N-doped zigzag edge as representatives of TM-Nx and the metal-free active sites, respectively. We find that the interaction of the Fe-N4 and quaternary-N-doped sites at the zigzag edge of graphene enhances the ORR free energy profile at the quaternary-N-doped site. However, the ORR free energy profile at the Fe-N4 site is not affected by this interaction.
authors.affiliation: Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan. kasai@dyn.ap.eng.osaka-u.ac.jp.
authors.forename: Adhitya G
authors.initials: AG
authors.lastname: Saputro
authors.forename: Hideaki
authors.initials: H
authors.lastname: Kasai