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<p>Iron-nitrogen-carbon (Fe-N-C) catalysts are promising alternative to noble metals for oxygen reduction reaction and are expected to make fuel cell and metal-air batteries technology more rational. Using biomass as an electrocatalyst support can further reduce the cost of catalyst production. This work successfully synthesized hierarchical porous Fe-N-C catalysts with ultra-high specific surface area by combining the structural design of carbon supports with the synergistic catalysis of FeN<sub>4</sub> sites and carbon-encapsulated Fe/Fe<sub>3</sub>C nanoparticles. Hierarchical pore structure was achieved via MgO template method. FeN<sub>4</sub> sites and Fe/Fe<sub>3</sub>C nanoparticles were introduced by pyrolysis of iron phthalocyanine. The optimized Fe-N-C catalyst with an extremely large specific surface area of up to 1134 m<sup>2</sup> g<sup>− 1</sup> provided the basis for the maximum growth of active sites and nanoparticles, which exhibited superior four-electron oxygen reduction reaction performance to commercial Pt/C in alkaline media, with a remarkable onset potential (<i>E</i><sub>on</sub>) of ~ 1.11&#xa0;V vs. RHE and the highest half-wave potential (<i>E</i><sub>1/2</sub>) of ~ 0.96&#xa0;V vs. RHE in 0.1&#xa0;M KOH. Finally, the composite catalysts showed outstanding durability and methanol tolerance at nearly one-third the cost of commercial Pt/C. This synthesis strategy has great significance for developing high-performance non-precious metal catalysts.</p> 图形摘要 <p></p>

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Carbon-encapsulated Fe/Fe3C nanoparticles combined with Fe-N4 sites as efficient four electron oxygen reduction catalysts

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Chunyu Zhu,
  • Wenhao Tao,
  • Peixing Du,
  • Manami Takata,
  • Yoshitaka Aoki,
  • Hiroki Habazaki,
  • Damian Kowalski,
  • Yan Yan Farm,
  • Nan Sheng

摘要

Iron-nitrogen-carbon (Fe-N-C) catalysts are promising alternative to noble metals for oxygen reduction reaction and are expected to make fuel cell and metal-air batteries technology more rational. Using biomass as an electrocatalyst support can further reduce the cost of catalyst production. This work successfully synthesized hierarchical porous Fe-N-C catalysts with ultra-high specific surface area by combining the structural design of carbon supports with the synergistic catalysis of FeN4 sites and carbon-encapsulated Fe/Fe3C nanoparticles. Hierarchical pore structure was achieved via MgO template method. FeN4 sites and Fe/Fe3C nanoparticles were introduced by pyrolysis of iron phthalocyanine. The optimized Fe-N-C catalyst with an extremely large specific surface area of up to 1134 m2 g− 1 provided the basis for the maximum growth of active sites and nanoparticles, which exhibited superior four-electron oxygen reduction reaction performance to commercial Pt/C in alkaline media, with a remarkable onset potential (Eon) of ~ 1.11 V vs. RHE and the highest half-wave potential (E1/2) of ~ 0.96 V vs. RHE in 0.1 M KOH. Finally, the composite catalysts showed outstanding durability and methanol tolerance at nearly one-third the cost of commercial Pt/C. This synthesis strategy has great significance for developing high-performance non-precious metal catalysts.

图形摘要