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Highly efficient oxygen reduction electrocatalysts based on winged carbon nanotubes.

Yingwen Cheng1, Hongbo Zhang, Chakrapani V Varanasi

  • 11] Department of Chemistry, Duke University, Durham, NC 27708 United States [2] Center for the Environmental Implication of NanoTechnology (CEINT), Duke University, Durham, NC 27708 United States.

Scientific Reports
|November 13, 2013
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Summary

Nitrogen-doped winged carbon nanotubes demonstrate superior performance for the oxygen reduction reaction (ORR). These novel electrocatalysts offer high efficiency and stability for fuel cells and metal-air batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Developing efficient electrocatalysts for the oxygen reduction reaction (ORR) is crucial for energy conversion technologies like fuel cells and metal-air batteries.
  • Current electrocatalysts often face challenges with selectivity, efficiency, stability, and tolerance to impurities.

Purpose of the Study:

  • To develop high-performance electrocatalysts for the oxygen reduction reaction (ORR) using a novel winged carbon nanotube structure.
  • To investigate the catalytic activity, selectivity, and stability of these new materials.

Main Methods:

  • Synthesis of unique winged carbon nanotubes by selective oxidation, unzipping, and exfoliation of carbon nanotubes/nanofibers.
  • Nitrogen doping of the exfoliated graphene wings.
  • Electrochemical characterization of the nitrogen-doped winged nanotubes for ORR performance.

Main Results:

  • The nitrogen-doped winged carbon nanotubes exhibited outstanding ORR activity via the preferred four-electron pathway.
  • The electrocatalysts demonstrated excellent stability and tolerance to methanol and carbon monoxide.
  • The structure facilitates efficient electron transport through intact inner tubes while the doped graphene wings provide high active site density.

Conclusions:

  • Winged carbon nanotubes, when nitrogen-doped, represent a highly effective class of electrocatalysts for the oxygen reduction reaction.
  • This novel nanostructure offers a promising platform for advancing fuel cell and metal-air battery technologies due to enhanced activity and durability.