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（...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.展开更多
基金partially supported by National Natural Science Foundation of China(Nos.51273158,21303131)
文摘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.
