부산대학교 도서관

The significant progress of non-precious metal cathodic electrocatalytic materials is impressive in electrochemical energy conversion application. Here, iron and nitrogen co-doped porous carbon spheres (Fe/N-PCS) have been designed via 3-aminophenol/formaldehyde (APF) resin spheres as carbon precursor, ferric nitrate as iron source, colloidal silica as template and tetramethylguanidine as catalyst by the improved Stöber method. Fe/N-PCS possesses uniform spherical morphology, abundant mesoporous shape and high surface area and exhibits higher oxygen reduction reaction (ORR) electrocatalytic activity (E 1/2 , 0.838 V vs. RHE) compared with the Pt/C (E 1/2 , 0.827 V vs. RHE) in alkaline media. In addition, the methanol tolerance and catalytic stability of Fe/N-PCS are greater than commercial Pt/C catalyst. The outstanding ORR behavior of Fe/N-PCS mainly benefits from the iron and nitrogen elements synergistic effect, pyridinic N and the spherical porous structure enabling plenty of active sites exposed. This method is prospective for preparation of highly efficient cathodic ORR electrocatalyst. [Display omitted] • Fe-N co-doped porous carbon spheres (Fe/N-PCS) are obtained by an improved Stöber method. • The synergistic effect between iron and nitrogen species dopant can facilitate ORR activities. • The Fe/N-PCS catalyst exhibits excellent ORR activity and stability in alkaline media. [ABSTRACT FROM AUTHOR]