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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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Multi-sites synergistic modulation in oxygen reduction electrocatalysis.

Menghui Chen1, Yongting Chen2, Jialin Cai1

  • 1Institute for Sustainable Energy/College of Sciences, Shanghai University, Shanghai 200444, China.

Journal of Colloid and Interface Science
|September 13, 2022
PubMed
Summary

High-performance iron-nitrogen-carbon (FeNC) catalysts for oxygen reduction reaction (ORR) were developed using a novel synthesis. These catalysts feature multiple synergistic active sites, outperforming platinum catalysts.

Keywords:
Fe-N(4)Oxygen reduction electrocatalysisPore defectPyridinic-N-CSynergy of multiple active-sites

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient, non-precious metal catalysts for oxygen reduction reaction (ORR) is crucial for energy technologies.
  • Iron-nitrogen-carbon (FeNC) materials are promising ORR catalysts, but understanding their active sites is key to performance.

Purpose of the Study:

  • To synthesize and characterize a single-atom FeNC catalyst with multiple active sites.
  • To investigate the interplay of different active sites (pyridinicNC, Fe-N4, pore defects) for enhanced ORR activity.
  • To evaluate the catalyst's performance against commercial platinum catalysts.

Main Methods:

  • High-temperature pyrolysis of melamine foam (MF), iron phthalocyanine (FePc), phthalocyanine (Pc), and zinc salts.
  • Characterization of active sites including pyridinicNC, Fe-N4, and pore defects.
  • Density functional theory (DFT) calculations to understand synergistic effects.
  • Electrochemical testing for ORR activity, methanol tolerance, and stability.

Main Results:

  • A single-atom FeNC catalyst was successfully synthesized, containing pyridinicNC, Fe-N4, and pore defect active sites.
  • MF contributed to pyridinicNC sites and catalyst framework; Pc facilitated Fe-N4 confinement; Zn salts created pore defects.
  • DFT calculations confirmed synergistic interactions among active sites for efficient ORR.
  • The optimal FeNC catalyst exhibited a half-wave potential of ~0.88 V (vs. RHE), superior methanol tolerance, and stability compared to Pt/C.

Conclusions:

  • Multiple synergistic active sites in FeNC materials significantly enhance ORR electrocatalysis.
  • The developed FeNC catalyst demonstrates high performance and stability, offering a promising alternative to platinum-based catalysts.