N,S‐co‐doped FeCo Nanoparticles Supported on Porous Carbon Nanofibers as Efficient and Durable Oxygen Reduction Catalysts

Abstract

Finding high-performance, low-cost, efficient catalysts for oxygen reduction reactions (ORR) is essential for sustainable energy conversion systems. Herein, highly efficient and durable iron (Fe) and cobalt (Co)-supported nitrogen (N) and sulfur (S) codoped three-dimensional carbon nanofibers (FeCoÀ N, S@CNFs) were synthesized via electrospinning followed by carbonization. The as-prepared FeCoÀ N,S@CNFs served as efficient ORR catalysts in alkaline 0.1 m KOH solutions that were N 2 and O 2saturated.The experimental results revealed that FeCoÀ N,S@CNFs were highly active ORR catalysts with defectrich active pyridinic N and pyrrolic N and metal bonds to N and S atom sites, which enhanced the ORR activity. FeCoÀ N,S@CNFs exhibited a high onset potential (E onset = 0.89 V) and half-wave potential (E 1/2 = 0.85 V), similar to the electrocatalytic activity of commercial Pt/C. Additionally, the durability of the as-prepared FeCoÀ N,S@CNFs catalysts was maintained for 14 h with longterm stability and high tolerance to methanol stability, accounting for their excellent catalytic ability. Furthermore, CoÀ N@CNFs, FeÀ N@CNFs, and varying Fe and Co ratios were compared with those of FeCoÀ

Creating Defects in the Active Site of Fe−N−C Catalyst Promotes Catalytic Performance for Oxygen Reduction Reaction

“…Additional references cited within the Supporting Information. [24][25][26][27][28][29][30][31][32][33][34][35]…”