A General Approach to Preferential Formation of Active Fe–N x Sites in Fe–N/C Electrocatalysts for Efficient Oxygen Reduction Reaction

Iron-nitrogen on carbon (Fe-N/C) catalysts have emerged as promising nonprecious metal catalysts (NPMCs) for oxygen reduction reaction (ORR) in energy conversion and storage devices. It has been widely suggested that an active site structure for Fe-N/C catalysts contains Fe-Nx coordination. However, the preparation of high-performance Fe-N/C catalysts mostly involves a high-temperature pyrolysis step, which generates not only catalytically active Fe-Nx sites, but also less active large iron-based particles. Herein, we report a general ???silica-protective-layer-assisted??? approach that can preferentially generate the catalytically active Fe-Nx sites in Fe-N/C catalysts while suppressing the formation of large…

• UD
  U.S. Department of Energy
• NR
  National Research Foundation of Korea

  Awards: NRF-2015M1A2A2056560, NRF-2013H1A2A1032644, NRF-2014R1A2A1A05002488
• KE
  Korea Evaluation Institute of Industrial Technology

  Award: 10050509