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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

141
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
141

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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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Ordered mesoporous carbon with binary CoFe atomic species for highly efficient oxygen reduction electrocatalysis.

Fengying Pan1, Ziyan Shen1, Xianjun Cao1

  • 1Joint International Laboratory on Environmental and Energy Frontier Materials, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, P. R. China. yufei-zhao@shu.edu.cn.

Nanoscale
|April 19, 2024
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Summary

Precious metal-free electrocatalysts are crucial for energy devices. This study developed a novel bimetallic cobalt-iron catalyst on carbon, showing superior performance for the oxygen reduction reaction compared to platinum.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • The oxygen reduction reaction (ORR) is critical for energy conversion devices.
  • Developing efficient, low-cost, precious metal-free ORR electrocatalysts is essential.
  • Sluggish ORR kinetics hinder the performance of many energy technologies.

Purpose of the Study:

  • To design and synthesize a novel bimetallic cobalt-iron (CoFe) electrocatalyst anchored on ordered mesoporous carbon (CoFe/NC).
  • To investigate the role of pyrolyzation temperature in optimizing the catalyst's structure and performance.
  • To evaluate the electrocatalytic activity, durability, and methanol tolerance of the synthesized CoFe/NC material for the ORR.

Main Methods:

  • Rational design and synthesis of bimetallic CoFe nanoparticles and atomically dispersed dual atoms on an ordered mesoporous carbon matrix.
  • Optimization of catalyst performance by varying pyrolyzation temperatures.
  • Electrochemical characterization in 0.1 M KOH, including cyclic voltammetry and rotating disk electrode measurements.
  • Density functional theory (DFT) calculations to elucidate the reaction mechanism and active sites.

Main Results:

  • The optimized CoFe/NC-750 catalyst demonstrated a high half-wave potential (E1/2) of 0.87 V vs. RHE for the ORR.
  • The catalyst exhibited excellent methanol tolerance and remarkable durability over 3000 cycles.
  • Performance metrics surpassed those of commercial platinum on carbon (Pt/C) electrocatalysts.
  • DFT calculations confirmed that modulated electronic structures of Fe active sites by CoFe alloys and Co single atoms enhance ORR kinetics.

Conclusions:

  • The developed CoFe/NC-750 serves as a highly efficient, precious metal-free electrocatalyst for the oxygen reduction reaction.
  • The synergistic effect between CoFe alloys, Co single atoms, and the carbon matrix significantly boosts ORR activity.
  • This work offers a promising strategy for designing advanced electrocatalysts for energy conversion and storage applications.