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<p>Single atom of transition metals (iron, cobalt, etc.) anchored on N-doped carbon materials (M-N-C) have become promising alternatives to Pt/C catalyst for oxygen reduction reaction (ORR) and proton exchange membrane fuel cells (PEMFC). Dual-atom catalysts (DACs) can further improve their performance due to the synergistic effect between two adjacent metal atoms, but the structure-activity relationship of the dual-metal-atom active site remains unclear, especially the impact of coordinated nitrogen species. Herein, we use a pre-carbonization and impregnation method to construct two different nitrogen coordinated Fe-Co dual-metal-atom active sites on carbon support. The existence of bimetallic dimer structure has been proved by HAADF-STEM and XAFS characterization. XPS results suggest that the pyridinic N and pyrrolic N content is different in two Fe-Co dual-atom catalysts. The experimental and theoretical ORR activity both suggest Fe-Co active site coordinated by pyridinic nitrogen is more favorable for ORR and PEMFC performance. Our work provides a deep insight into the relationship between the N species and activity of Fe-Co dual-metal-atom ORR catalysts.</p> Graphical Abstract <p></p>

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Impact of Nitrogen Species on Fe-Co Dual-Atom Catalysts: Enhancing Oxygen Reduction Reaction and Proton Exchange Membrane Fuel Cell Performance

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • Yinuo Wang,
  • Guizhi Xu,
  • Xiao Hu,
  • Liang Chang,
  • Zhiyuan Guo,
  • Jiayao Deng,
  • Wenting Hu,
  • Hongjie Zhang

摘要

Single atom of transition metals (iron, cobalt, etc.) anchored on N-doped carbon materials (M-N-C) have become promising alternatives to Pt/C catalyst for oxygen reduction reaction (ORR) and proton exchange membrane fuel cells (PEMFC). Dual-atom catalysts (DACs) can further improve their performance due to the synergistic effect between two adjacent metal atoms, but the structure-activity relationship of the dual-metal-atom active site remains unclear, especially the impact of coordinated nitrogen species. Herein, we use a pre-carbonization and impregnation method to construct two different nitrogen coordinated Fe-Co dual-metal-atom active sites on carbon support. The existence of bimetallic dimer structure has been proved by HAADF-STEM and XAFS characterization. XPS results suggest that the pyridinic N and pyrrolic N content is different in two Fe-Co dual-atom catalysts. The experimental and theoretical ORR activity both suggest Fe-Co active site coordinated by pyridinic nitrogen is more favorable for ORR and PEMFC performance. Our work provides a deep insight into the relationship between the N species and activity of Fe-Co dual-metal-atom ORR catalysts.

Graphical Abstract