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On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method
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Ultralow-loading platinum-cobalt fuel cell catalysts derived from imidazolate frameworks.

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  • 1Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, USA.

Science (New York, N.Y.)
|November 10, 2018
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Researchers developed new electrocatalysts using ultralow platinum and cobalt-based precursors. These catalysts show high activity and stability for the oxygen reduction reaction (ORR) in fuel cells, crucial for cost reduction.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Reducing platinum content is key to lowering fuel cell costs.
  • Developing highly active and stable electrocatalysts is essential for efficient fuel cell operation.

Purpose of the Study:

  • To create novel electrocatalysts with ultralow platinum loading for enhanced fuel cell performance.
  • To investigate the synergistic effects of platinum-cobalt nanoparticles and PGM-free substrates.

Main Methods:

  • Utilized cobalt or bimetallic cobalt-zinc zeolitic imidazolate frameworks as precursors.
  • Prepared strained platinum-cobalt core-shell nanoparticles on a PGM-free substrate.
  • Employed computational modeling to understand catalytic mechanisms.

Main Results:

  • Achieved high oxygen reduction reaction (ORR) mass activities (1.08 and 1.77 A mgPt-1).
  • Demonstrated excellent fuel cell performance under O2 or air at high voltage and current.
  • Catalysts retained 64% and 15% of initial activity after 30,000 voltage cycles.

Conclusions:

  • Synergistic catalysis between Pt-Co nanoparticles and PGM-free sites enhances ORR activity and durability.
  • This approach offers a promising strategy for cost-effective fuel cell electrocatalysts.