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A highly active nitrogen-doped catalyst with a unique red-blood-cell(RBC) like structure is reported for oxygen reduction reaction(ORR).The catalyst Fe,N-C@carbon-900 was prepared by pyrolysis of the polyaniline(PANl) and polystyrene(PS) composites with adsorption of ferric ion on the shell of sphere structure at 900℃.Fe,N-C@carbon-900 with a unique RBC-like structure provides plenty of catalytic sites combining the electrical conductivity of the carbon sphere with the catalytic activity of the nitrogen-doped layer.The four-electron reduction pathway is selected for the catalyst Fe,N-C@carbon-900.The catalyst exhibit the ORR E_(onset) at 0.87 V(potentials is versus to reversible hydrogen electrode(RHE)),E_(1/2) at 0.78 V and high diffusion-limiting current density(5.20mA/cm~2).Furthermore,this work indicates that both N and Fe accounted for high activity of the catalyst Fe,N-C@carbon-900 toward the oxygen reduction process.It is concluded that Fe and N exhibit synergistically promotion in the ORR activity for the catalyst Fe,N-C@carbon-900.We also provide a rational design of electrocatalysts with high ORR activity to further clarify the essential ORR sites of heteroatom doped carbon materials for fuel cells and metal-air battery applications.
A highly active nitrogen-doped catalyst with a unique red-blood-cell (RBC) like structure is reported for oxygen reduction reaction (ORR). The catalyst Fe, NC @ carbon- 900 was prepared by pyrolysis of the polyaniline polystyrene (PS) composites with adsorption of ferric ion on the shell of sphere structure at 900 ° C. Fe, NC @ carbon-900 with a unique RBC-like structure provides plenty of catalytic sites combining the electrical conductivity of the carbon sphere with the catalytic activity of the nitrogen-doped layer. The four-electron reduction pathway is selected for the catalyst Fe, NC @ carbon-900. the catalyst exhibit the ORR at onset at 0.87 V potentials is versus reversible hydrogen electrode (RHE) ), E_ (1/2) at 0.78 V and high diffusion-limiting current density (5.20 mA / cm ~ 2) .Furthermore, this work indicates that both N and Fe accounted for high activity of the catalyst Fe, NC @ carbon- 900 toward the oxygen reduction process. It is said that Fe and N exhibit synergistically promoti on in the ORR activity for the catalyst Fe, N-C @ carbon-900. We also provide a rational design of electrocatalysts with high ORR activity to further clarify the essential ORR sites of heteroatom doped carbon materials for fuel cells and metal-air battery applications.